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ABSTRACT. A new species of Downeshelea Wirth & Grogan, 1988, D. oliveirai (Lane & Wirth, 1964) and D. guianae (Wirth, 1953), are reported from northern Brazil.Material from light trap collections from Rondônia and Pará states included an undescribed species of Downeshelea that we describe herein.The terminology used is that adopted by WIRTH & WILLIAMS (1964) for North American species of Monohelea Kieffer, 1917, LANE & WIRTH (1964 for Neotropical species, and RATANAWORABHAN & WIRTH (1972) for Oriental species. The terms of wing veins follow the system of the Manual of Neartic Diptera (MAC ALPINE et al., 1981), with modifications proposed by SZADZIEWSKI (1996). All measurements are in micrometers, except those of the wings which are in millimeters. Head. Brown. Eyes (Fig. 4) bare, narrowly contiguous in lower portion. Antenna (Fig. 3) brown except on basal portion of flagellomeres; flagellomeres cylindrical, with mean lengths of 59-40-42-43-43-48-48-48-75-75-80-80-101 μm (n= 9), Antennal Ratio (11-15/3-10) 1.08-1.17 (1.11; n=9). Palpus (Fig. 5) uniformly brown, longer than proboscis; lengths of segments 29-48-74-42-58 μm; 3 rd segment cylindrical, slightly swollen distally, with a moderately deep sensory pit in mid portion; Palpal Ratio 2.2-2.8 (2.6; n=9). Mandible with 11 teeth. Downeshela oliveiraiThorax. Brown, without definite pattern in slide mounted specimens. Legs (Fig. 8) brown, the hind slightly darker; knees yellowish; fore and hind tibiae with apical spur, longer in fore leg; hind tibial comb with six bristles; lengths of trochanters, femora and tibiae of fore, mid and hind legs 117-533-522, 117-640-608, 128-746-683 μm (n=10). Tarsi (Fig. 7) pale, pilose; ventral palisade setae in one row on hind basitarsus; fore and hind basitarsi with one basal and one apical spine; mid basitarsus with 2 basal, 2 apical and 3-4 ventral spines; apical spines of tarsomeres 2-4 of fore, mid and hind legs as follows: 1-1-1, 2-2-1, 1-1-2, basal spines absent; lengths of fore, mid and hind tarsomeres 245-117-74-53-106, 309-128-74-53-96, 458-192-117-85-85 μm (n=10); fore, mid and hind tarsal ratios 2.3, 2.4, 2.2 (n=6); claws of fore and mid legs paired, equal sized, about 0.6 times as long as 5 th tarsomere; hind leg with a single claw, about 1.1 times as long as 5 th tarsomeres. Wing (Fig. 1) hyaline, scattered macrotrichia distally in cell r 3 and m 1 , microtrichia absent; 2 conspicuous dark spots, one locate on the r-m crossvein reaching the medial fork, the other in cell r 3 , extending from the end of 2 nd radial cell to vein M1; six inconspicuous grayish, diffuse areas in apical portions of cells r 3 , m 1 , m 2 (this one reaching to vein M2 and extending from cell m 1 ), cua 1 (this one reaching vein CuA 1 ) and veins M1 and CuA 2 ; 2 nd radial cell nearly twice as long as 1 st ; costal ratio 0.77-0.81 (0.79, n=9).Abdomen. Brown. Two subspherical spermathecae (Fig. 6) slightly unequal, measuring 69 by 53 μm and 57 by 45 μm; a vestigial 3 rd present, 16 μm long. Male. Wing length 1.13-1.32 (1.27, n=5) mm; breadth 0....

Morphological alterations in six different species of females Culicoides Latreille, 1809 and one of Monohelea Kieffer, 1917 from Brazil, Mexico, Panama and Peru are described. The correlation of the morphological changes with the taxonomy and behavior of the species is discussed.

ABSTRACT.A new species of Culicoides of the subgenus Mataemyia Vargas, Culicoides huaynacapaci Felippe-Bauer, is described and illustrated based on female and male specimens collected biting humans in Department of Cajamarca, in Peruvian Amazonia. The new species is compared with its similar congener C. albuquerquei Wirth & Blanton.KEYWORDS. Diptera, Ceratopogonidae, Culicoides (Mataemyia) huaynacapaci, Neotropical bloodsucking midge, Peru. The general terminology used is that employed in papers on Culicoides by WIRTH & BLANTON (1959, 1973, 1974 for Panama, the Amazon Basin, and the West Indies, as well as the atlas of wing photographs of Neotropical species by WIRTH et al. (1988). The terms of wing veins follow the system of the Manual of Nearctic Diptera (MAC ALPINE et al., 1981), with modifications proposed by SZADZIEWSKI (1996). All measurements are in micrometers, except those of the wings which are in millimeters. RESUMO. Uma nova espécie deCulicoides huaynacapaci Felippe-Bauer, sp. nov. Diagnosis. A species of the subgenus Mataemyia very similar to C. albuquerquei Wirth & Blanton, from which it can be distinguished by its larger size (wing length 1.22-1.38 mm), costal ratio (0.63-0.66) and by the presence of sensilla coeloconica on the flagellomeres 1, (5), 6-8 on female. Male genitalia with distal portion of the aedeagus slightly expanded on lateral margin, ending in a pair of direct, pointed processes with straight emargination.Female. Wing length 1.22-1.38 (1.30, n=10) mm; breadth 0.54-0.62 (0.58, n = 10) mm.Head. Brown. Eyes (Fig. 3) nearly contiguous, bare. Pedicel brown; flagellum (Fig. 4) (Fig. 7). Palpus (Figs. 8, 10) brown; lengths of segments 21-53-64-21-27 µm (n=9); 3rd segment slightly swollen distally, with a moderately deep sensory pit on distal portion; palpal ratio 2.2-2.8 (2.4, n=9). Proboscis moderately short; P/H ratio 0.64-0.76 (0.69, n=10); mandible with 13 teeth.Thorax. Brown; without definite pattern in slide mounted specimens. Legs mostly brown; femora with subbasal, subapical pale bands, tibiae with subbasal pale bands; hind tibia pale apically (Fig. 11); hind tibial comb ( Fig. 6) with four spines, the two nearest the spur longest. Tarsi (Fig. 9) pale, tarsomeres of hind leg darkest. Wing ( Fig. 1) with pattern as in photographs: cell r 3 with three pale spots, two well separated poststigmatic spots, anterior one small, rounded, reaching wing margin, posterior one transverse, located beyond 2 nd radial cell about halfway between it and vein M 1 , apical spot double, oblique, broadly reaching wing margin; cell m 1 with two pale spots, distal most far from wing margin, longer than basal one; cell m 2 with a double pale spot lying between medial, mediocubital forks, a pale spot at wing margin; cell cua 1 with round pale spot nearly reaching wing margin; anal cell with two distal round pale spots; wing base with faint pale spot; vein M 1 with faint distal pale spot; veins M 2 , CuA 1 and CuA 2 dark; macrotrichia sparce, extending from base to wing tip; 2 nd radial cell with distinc...

A new species of Culicoides of the subgenus Diphaomyia, Culicoides jurbergi Felippe-Bauer, is described and illustrated based on female specimens collected biting man and with light traps in Peruvian Amazonia. The species is compared with its similar congener mirsae Ortiz.Key words: Diptera -Ceratopogonidae -Neotropical bloodsucking midges -Culicoides (Diphaomyia) jurbergi sp.n. -PeruThe genus Culicoides Latreille presently contains 285 Neotropical species [271 are included in Borkent and Wirth (1997) and in Borkent and Spinelli (2000)]. It is poorly known in Peru with only 4 species originally described for this country and 13 more subsequently reported. Of the 285 Neotropical species, 11 belong to the subgenus Diphaomyia Vargas, none of them recorded from Peru. The purpose of this work is to describe and illustrate a new species of this subgenus from Peru, based on female specimens captured while biting humans or from light trap collections.The terminology used is that employed in Culicoides papers by Wirth and Blanton for Panama (1959), the Amazon Basin (1973), and the West Indian (1974), as well as the atlas of wing photographs of Neotropical species by Wirth et al. (1988). All measurements are in micrometers, except those of the wings which are in millimeters. Culicoides jurbergi Felippe-Bauer, new species (Figs 1-8)Diagnosis -A species of the subgenus Diphaomyia very similar to C. mirsae Ortiz. The female can be distinguished by its greater size (wing length 0.92-1.05 mm), palpal ratio (2.7-3.4), antenal ratio (0.92-1.12), P/H ratio (1.00-1.21) and by the presence of sensilla coeloconica on the flagellomeres 1,8-13. Male unknown.Female -Wing length 0.92-1.05 (0.99, n = 14) mm; breadth 0.46-0.54 (0.50, n = 14) mm.Head -Brown. Eyes (Fig. 2) pubescent, broadly separated by distance of diameter of 1.5-2 ommatidia. Flagellum (Fig. 3) brown, with proximal 1/3 of flagellomeres 1-6 paler; flagellomeres with mean lengths of 37-29-32-35-35-35-35-37-48-48-53-56-80 µm (n = 14); antennal ratio 0.92-1.12 (1.03, n = 14); sensilla coeloconica on flagellomeres 1,8-13, one, rarely two on 1 and 13. Palpus ( Fig. 4) brown; lengths of segments 21-61-80-24-24 µm; 3rd segment slightly swollen distally, with a moderately deep sensory pit on distal portion; palpal ratio 2.7-3.4 (3.0, n = 13). Proboscis long; P/H ratio 1.00-1.21 (1.09, n = 14); mandible with 20 teeth.Thorax -Brown; without definite pattern in slide mounted specimens. Legs mostly brown; fore, mid femora with subapical, tibiae with subbasal pale bands; hind tibia slightly pale apically (Fig. 8); hind tibial comb (Fig. 7) with four spines, the one nearest spur longest. Tarsi (Fig. 6) pale, first tarsomere darkest. Wing ( Fig. 1) with pattern as in photographs: membrane infuscated, pale spots small and definite; cell r5 with four small separated pale spots, one, round, lying on distal side of r-m crossvein, two well separated poststigmatic pale spots, the anterior one small, rounded, reaching wing margin, the posterior one transverse and located beyond 2nd radial cell,...