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					                                                                              VOLUMEN No 24, año 2000

Dos especies nuevas de Aegorhinus (Coleoptera: Curculionidae: Aterpini) de Chile.

Two new Aegorhinus species (Coleoptera: Curculionidae: Aterpinae) from Chile.

ELGUETA, M.

ABSTRACT
Two new Aegorhinus species are described: A. maulinus n.sp. and A. bilineatus n.sp.                 Based on
morphological features the former is associated to A.servilleia and the latter to A. albolineatus – A.
superciliosus species group. Adults and some other illustrations of internal and external structures are given
as complement for recognition. Geographical distribution of A. delfini (Germain), an endemic component of
the Magellanic forest, is precised.


Nidificación, conducta de machos de Centris (Wagenknechtia) rodophthalma Pérez (Hymenoptera:
Anthophoridae) y comparación con otras especies chilenas del género.

Nesting, male behavior of Centris (Wagenknechtia) rodophthalma                          Pérez    (Hymenoptera:
Anthophoridae) and comparisons with other chilean species of the genus.

CHIAPPA, E., R. BASCUÑAN Y S. RODRÍGUEZ.

ABSTRACT
The nesting biology of Centris rodophthalma Pérez is described and compared to published accounts of C.
autrani, C. cineraria, C. mixta tamarugalis and C. nigerrima. All are ground nesting solitary species with nests
constructed in plane surfaces or soft slopes, but those of C. cineraria and C. nigerrima are located into vertical
walls too. Except C. mixta tamarugalis, the other ones built a not ramified tunnel filled with loose soil when the
nests have been closed. The number and disposition of the cells is differentin in each one of the species, no
more than 10 serially arranged in C. autrani, 3-4 placed laterally in C. cineraria and C. nigerrima, 4-8 in C.
mixta tamarugalis near the tunnel base, and 1-3 radially distributed at the end of a not curved tunnel in C.
rodophthalma. In addition, proterandry, mating, male mating strategies, sleeping aggregations as well as
rejection of males by females are reported and discussed.




Simuliidae (Diptera) del Río Quequén Grande en Las Cascadas, (Buenos Aires, Argentina): variación
poblacional y relación con temperatura, caudal y precipitaciones.

Simuliidae (Diptera) from Quequén Grande River at Las Cascadas (Buenos Aires, Argentina):
population variation and relationship with temperature, stream discharge and precipitations.

COSCARÓN , S.; S.L. COSCARÓN-ARIAS Y G. PORCARO.

ABSTRACT
Quequén Grande is a river plain of the Southern area of Buenos Aires province; the river source is in the
Tandilia mountain system and has a permanent flow. The area has a temperate climated and rains are more
or less uniformly distributed all over the year. Black fly larvae and pupae were sampled mostly biweekly
during 26 months at Las Cascadas area, about 15 km. North Necochea City. Two species, simulium
(Psaroniocompsa) bonaerense Coscarón & Wygodzinsky and S. (Thyrsopelma) orbitale Lutz, were found.
The former was more abundant and was present all along the year. Immature density of S. bonaerense do not
show correlation with temperature, precipitation or stream discharge. S. orbitale shows negative correlation
with temperature.
Datos biológicos y descripción de estado inmaduros de Exochonotus eugeniae (Coleoptera: Cleridae:
Enopliinae).

Biological data and description of immatures stages of Exochonotus eugeniae (Coleoptera: Cleridae:
Enopliinae).

SOLERVICENS J.

ABSTRACT
The association of Exochonotus eugeniae to plants of Euphorbia lactiflua affected by xylophagous insects and
                                                                                º
their restricted geographic distribution in the Pan de Azúcar National Park (26 08’ S), III Region, Chile, are
recognized. A probable competitive displacement is suggested between Exochonotus eugeniae and
Inhumeroclerus thomsoni in the desert inhabited by Euphorbia lactiflua. The mature larvae and the pupa of
the species are described.



Mínima superficie de recuento en trampas adhesivas para trips y mosquitas blancas en pepino de
invernadero.

Least surface counting for thrips and whiteflies on sticky traps on greenhouse cucumbers.

CARRIZO P.

ABSTRACT
Counting time of insects trapped on sticky traps might be reduced, considering only part of the plates, after
examining their distribution on the surface of the traps. This work examined the possibility for Frankliniella
occidentalis and Trialeurodes vaporariorum, two pests of greenhouse cucumbers, in a given area of standard
10 x 13 cm. sticky traps. Tests were carried out with yellow and blue traps, counting those insects traped on
whole traps, and on seven different distribution areas. Frankliniella occidentalis represented more than 95% of
the trips species, and whiteflies were 100% Trialeurodes vaporariorum. The expected capture was compared
with catches on each design using the G fitness test. For whiteflies, 96% of the tests fitted the expected
values. For thrips, 32% and 13% did the same for yelow and blue traps, respectively. Paired t test were used
to determine if catches on each design were higher or lower than average on the whole-trap counts. Whiteflies
tended to be more uniformly distributed on the suface than the trips, which showed some grouping, especially
on blue taps. Counting the insects on two 2 cm wide horizontal strips on the top and bottom edges gave
counts not significantly different (based on surface area) from whole-trap figures, for both whiteflies and thrips.
This technique would reduce counting time by 70% compared with whole-trap counts, because only 30% of the
trap area is counted.




Culícidos (Diptera) del río Chillón y sectores adyacentes de la provincia constitucional del Callao,
Perú, durante El Niño 1997-98.

Culicids (Diptera) of the Chillón River and adjacent areas from the constitutional province of Callao,
Perú, during “El Niño” event 1997-1998.

IANNACONE J.; L. ALVARIÑO; R. MORENO; M. REYES Y J. CHAUCA.

ABSTRACT
The present study evaluated some areas of natural breeding places of mosquitoes near human population in
Callao-Perú during December 97 to August 98:Chillon river margins, adjacent areas to underdevelopment
town “Los Carrizales” and Ventanilla wetlands (Ventanilla district) and underdevelopment towns: Tiwinza,
Daniel A. Carrión and Francisco Bolognesi (Carmen de la Legua district). Larvae of culicids of medical
importance as Anophles pseudopunctipennis (Theobald), Culex quinquefasciatus (Say) and Aedes
taeniorhynchus (Wiedemann) were assessed. A. taeniorhynchus was registered for the first time during
August 98 at “Los Carrizales” and Ventanilla wetlands in areas with the highest salinities (39,5%) in
comparison with the other areas of natural breeding places of mosquitos. The least water temperatures
         o
(21,1% C) and the highest pH (7,8 ) were observed in these localities. Chillon River presented the highest
richness of biological taxa of all localities evaluated. The culicid A. pseudopunctipennis was observed in
                                                       o                                  o
Chillon River at the highest air temperature (28,6 C) and water temperature (28,1 C) and the least pH
(7,02). Moreover, spatial and temporal variation of population and the larvae index were observed in nine
survey points of Chillon River. High larvae indexes of A. pseudopunctipennis were associated with presence of
the algae Cladophora glomerata (L.) Kuetzing and with the marcrophyte Lemma minor (L.). The larvivorous
fish Poecilia reticulata Peters, nayads of Libellulidae and Coenagrionidae (Odonata) and adults of Dytiscidae
(Coleoptera) were recorded as potential predators. The adults were compared with those of the 1995-96 Pre-
ENSO event, concluding that one of the consequences of Southern Oscillation ENSO “El Niño” 1997-98 event
in the Peruvian coast was an increase of the population of these culicids of medical importance.




Curacavi nuevo género de Cleridae de Chile Central (Coleoptera: Cleridae: Enopliinae).

Curacaví, new genus of Cleridae from Central Chile (Coleoptera: Cleridae: Enopliinae).

SOLERVICENS J.

ABSTRACT
Curacaví, a new genus of Cleridae from Central Chile is described. Its systematic position in the subfamily
Enopliinae is proposed.



Una nueva especie chilena de Leioproctus (Spinolapis) (Hymenoptera: Colletidae).

A new species of Leioproctus (Spinolapis) (Hymenoptera: Colletidae).

TORO H.

ABSTRACT
In this work a new species of Leioproctus (Spinolapis) from the central zone of Chile is described.


Ageniaspis citricola (Hymenoptera: Encyrtidae) parasitoide específico de Phyllocnistis citrella
(Lepidoptera: Gracillarridae):Introducción y datos preliminares sobre su desempeño en Argentina.

Ageniaspis citricola (Hymenoptera: Encyrtidae) a specific parasitoid on Phyllocnistis citrella
(Lepidoptera:Gracillarridae):Introduction and preliminary data on its performance in Argentina.

DIEZ P.; P. FIDALGO Y E. FRÍAS.



ABSTRACT
A.citricola was fortuitously introduced in Argentina, probably together with it host. Nevertheless, this species
was introduced again in citrus orchards from Perú. A key to separate the two species of Ageniaspis known for
Argentina and biobliography on life history and use in biological control are provided. Data about the
performance of this exotic species are compared with that of native parasitoids.

Evidencias de domesticación y aspectos biológicos de Panstrongylus geniculatus                 (Latreille, 1811)
(Hemiptera: Reduviidae).
Evidences of domestication and biological aspects of Panstrongylus geniculatus               (Latreille, 1811)
(Hemiptera: Reduviidae).

MARTA W OLF Y DIANA CASTILLO.

ASBTRACT
Panstrongylus geniculatus is considered a sylvatic triatomine and has been found naturally infected with
Trypanosoma cruzi in human habilitations in the municipality of Amalfi, Antioquia-Colombia. Evidence of P.
genicuculatus domestication is reported here. 640 houses were sampled monthly during a year in nine towns,
at Amalfi, Antioquia. 93 adults, eggs and a nymph were colleted in 80 houses.The indicators of risk of
transmission of T. cruzi by P. geniculatus found were: dispersion (100%), domiciliary infestation (12,5%),
density (14,53%), colonization (1,25%), accumulation (116,25%) and relative infection (21,21%). In two towns:
Montebello y Picardia, was observed P. geniculatus parasitized by T. cruzi, with indexes of 21,21% and 50%
respectively. In laboratory the comsumption of blood and the time of feeding were bigger in females of P.
geniculatus than in males and the times of deyection was smaller in females than males. The displacement of
this insect toward the housing was not determined exclusively by electric light, since 24% of housing lack it;
probably ecological changes and housings contidions can favor the lodging of this triatomine.

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