Abstract The pupa of Schizonyxhelea thomsenae (Wirth) is described and illustrated from material collected in Misiones province, Argentina. A key for the four known species of pupae of Schizonyxhelea is given, a diagnosis and photographs of the adult are also provided, and the geographic distribution of the species in the Neotropical region is enlarged including first records from Argentina, Brazil and Peru based mainly on adult specimens.

We present the results of the frst survey on the Ceratopogonidae from the “Reserva Natural Integral Punta Lara”, in Buenos Aires province. This protected area represents the southernmost relict of gallery forest where the knowledge of the insect fauna is still limited. Catches were conducted in areas of grassland and marginal forest with Malaise traps, CDC light traps and funnel light traps. A total of 4,195 specimens belonging to nine genera and 39 species of Ceratopogonidae were identifed. A list of the species present in the protected area is provided, along with their distributional data. Twenty-three species are recorded from the reserve for the frst time, while Dasyhelea mediomunda Minaya, Forcipomyia ( Forcipomyia) taragui Marino, Spinelli & Cazorla, Forcipomyia ( Microhelea) fuliginosa (Meigen), Stilobezzia (Eukraiohelea) elegantula (Johannsen) and Stilobezzia (Stilobezzia) punctulata Lane are recorded for the frst time in Buenos Aires province.

Se presenta el primer relevamiento de Ceratopogonidae de la Reserva Natural Integral Punta Lara, en la provincia de Buenos Aires. Este área protegida representa uno de los relictos más australes de la selva en galería, donde el conocimiento de la fauna de insectos es aún limitado. Las capturas se realizaron en ambientes de pastizal y selva en galería, con trampas Malaise y trampas de luz, tipo CDC y embudo. Un total de 4.195 especímenes pertenecientes a nueve géneros y 39 especies de Ceratopogonidae fueron identifcados. Se brinda un listado de las especies presentes en el área, y se proveen datos de su distribución geográfca. V eintitrés especies se citan en la Reserva por primera vez, mientras que Dasyhelea mediomunda Minaya, Forcipomyia (Forcipomyia) taragui Marino, Spinelli & Cazorla, Forcipomyia (M icrohelea) fuliginosa (Meigen), Stilobezzia (Eukraiohelea) elegantula (Johannsen) y Stilobezzia (Stilobezzia) punctulata Lane se registran por primera vez en la provincia de Buenos Aires.

New records of the following ten species of the subgenus Stilobezzia of Stilobezzia are provided for the Neotropical region: S. blantoni Lane & Forattini, S. chaconi Macfie, S. fiebrigi Kieffer, S. glauca Macfie, S. kiefferi Lane, S. maculata Lane, S. pallescens Lane & Forattini, S. paulistensis Lane, S. punctulata Lane and S. rabelloi Lane. Three of these species, S. glauca, S. kiefferi and S. maculata, are recorded for the first time in Argentina.

Study of the type material, new specimens of Stilobezzia (Acanthohelea) curvistyla and recently collected Stilobezzia (A.) megatheca showed an erroneous association of sexes in both species. The female allotype of S. (A.) megatheca belongs to Stilobezzia (A.) curvistyla. The right association of sexes is provided, the male of S. (A.) curvistyla is redescribed, the species diagnosis is expanded and its geographic distribution is extended.

El estudio del material tipo, y de ejemplares de Stilobezzia (Acanthohelea) curvistyla y de Stilobezzia (A.) megatheca, colectados recientemente, demostró una incorrecta asociación de sexos en ambas especies. El alotipo hembra de S. (A.) megatheca pertenece a Stilobezzia (A.) curvistyla. Se realiza la correcta asociación de sexos de S. (A.) curvistyla, se redescribe el macho de esta especie, se expande su diagnosis y se amplía su distribución geográfica

Uma espécie nova da Região Neotropical, Stilobezzia (Stilobezzia) pseudopunctulata Cazorla & Ronderos, é descrita e ilustrada a partir de adultos macho e fêmea e exúvia pupal. Os adultos foram coletados nas províncias argentinas de Chaco, Formosa, Corrientes e Buenos Aires e em Santa Cruz, Bolívia. A pupa foi coletada em tapetes de macrófitas aquáticas flutuantes em um lago na Ilha de Marchantaria, nas proximidades de Manaus, Brasil. Esta espécie nova é comparada com a sua congênere semelhante Stilobezzia punctulata Lane, a partir da qual pode ser distinguida principalmente pela asa com apenas duas manchas escuras, parâmeros mais longos e em forma de gancho, órgão respiratório da pupa com 11-12 poros e processo apicolateral do segmento anal muito curto.

A new species from the Neotropical Region, Stilobezzia (Stilobezzia) pseudopunctulata Cazorla & Ronderos, is described and illustrated based on male and female adults and pupal exuviae. Adults were collected in the Argentinian provinces of Chaco, Formosa, Corrientes and Buenos Aires, and in Santa Cruz, Bolivia. The pupa was collected from mats of floating aquatic macrophytes in a lagoon in Ilha da Marchantería, in the vicinities of Manaus, Brazil. This new species is compared with its similar congener Stilobezzia punctulata Lane, from which it can be mainly distinguished by the wing with only two dark spots, the parameres longer and hook-shaped, the pupal respiratory organ with 11-12 pores and the very short apicolateral processes of the anal segment.

A new species, Stilobezzia ( Acanthohelea) longisternalis, collected in the Nothofagus forest of the Nahuel Huapi National Park (Argentina) is described, photographed and illustrated based on the examination of male and female adults. The new species can be easily recognized by the elongate and narrow posteromedian projection of the male sternite 9; it is compared with S. (A.) hirsuta Ingram & Macfie.

Una nueva especie, Stilobezzia (Acanthohelea) longisternalis, colectada en los bosques de Nothofagus del Parque Nacional Nahuel Huapi (Argentina), se describe, fotografía e ilustra en base al estudio de machos y hembras adultos. La nueva especie se reconoce fácilmente por presentar una proyección posteromediana alargada y delgada en el esternito 9 de los machos. Se compara con S. (A.) hirsuta Ingram & Macfie.

A list of the ceratopogonid species from the Sistema Serrano de Ventania, Buenos Aires, Argentina is presented. Six field trips were carried out sampling nine different localities. Twenty five species of ceratopogonids belonging to eight genera were recorded; only Culicoides venezuelensis and Brachypogon (Brachypogon) bonaerensis were known from the area. Eight species are reported for the first time from Buenos Aires province and one from Argentina.

Se brinda un listado de especies de ceratopogónidos presentes en el Sistema Serrano de Ventania, Buenos Aires, Argentina. Se realizaron seis viajes de estudio y se relevaron nueve sitios de muestreo. Se identificaron 25 especies pertenecientes a ocho géneros, de las cuales sólo Culicoides venezuelensis y Brachypogon (Brachypogon) bonaerensis han sido citadas previamente para el área. Ocho especies se registran por primera vez para la provincia de Buenos Aires y una para Argentina.

Se describe Palpomyia iberaensis n. sp., recolectada con trampa Malaise en Corrientes, Argentina, con base en una hembra que traía adheridos los órganos genitales del macho. Se ubica la especie en el grupo tibialis a pesar de tener parameros con puntas curvadas. Se compara la especie con su congénere brasileño Palpomyia mellichroa.

Palpomyia iberaensis n. sp., was collected by Malaise trap in the province of Corrientes, Argentina and its female and attached male genitalia are described and illustrated. The species is distinguished by the following combination of characters: females with dark brown legs except fore trochanter, basal 1/2 of fore femur, basal 2/3 of mid femur, fore and mid tibiae except extreme tip, yellowish brown; fore femur with four to five, mid femur with two ventral spines; abdomen lacking gland rods. Males with gonocoxite stout, with a conspicuous posteromesal pointed hook; gonostylus short, curved; parameres entirely divided, the distal portions slender with two posteriorly directed processes. This species is placed in the tibialis group in spite of the curious parameres without recurved tips. The species is compared with its congener Palpomyia mellichroa, from southeastern Brazil. Rev. Biol. Trop. 54 (3): 1067-1070. Epub 2006 Sept. 29.

ABSTRACT. Stilobezzia (Eukraiohelea) amnigena (Macfie) is recorded for the first time from Argentina, and Stilobezzia (E.) elegantula (Johannsen) from Argentina and Paraguay. Stilobezzia subsessilis Kieffer is recognized as a junior synonym of S. elegantula.

RESUMEN. Se registra por primera vez para la Argentina a Stilobezzia (Eukraiohelea) amnigena (Macfie) y a Stilobezzia (E.) elegantula (Johannsen) para la Argentina y Paraguay. Se reconoce a Stilobezzia subsessilis Kieffer como sinónimo menor de S. elegantula.

New findings in Argentina of the following five species of the tribe Palpomyiini are reported: Amerohelea pseudofasciata Grogan and Wirth and Bezzia venustula (Williston), in the Somuncurá plateau in Río Negro province; Bezzia chilensis Ronderos and Spinelli, in western Río Negro and Salta provinces; Bezzia fluminensis Lane, in northern Corrientes province; and Clastrieromyia uruguayensis Spinelli and Grogan, in La Pampa province.

Se informa acerca de nuevos hallazgos en la Argentina de las siguientes cinco especies de la tribu Palpomyiini: Amerohelea pseudofasciata Grogan and Wirth y Bezzia venustula (Williston), en la meseta de Somuncurá en la provincia de Río Negro; Bezzia chilensis Ronderos and Spinelli, en el Oeste de las provincias de Río Negro y Salta; Bezzia fluminensis Lane, en el norte de la provincia de Corrientes; y Clastrieromyia uruguayensis Spinelli and Grogan, en la provincia de La Pampa.