Macrostomus penai, Rafael, José Albertino & Cumming, Jeffrey M., 2006

Rafael, José Albertino & Cumming, Jeffrey M., 2006, New species of Macrostomus Wiedemann (Diptera, Empididae) from Colombia, Ecuador and Peru, Zootaxa 1136, pp. 49-64 : 58-60

Macrostomus penai , n. sp.

( Figs. 23–28 , 40 )

Diagnosis. Male and female frons and face wide; postgena setae strong; cell dm rather truncate; M1, M2 and A1 rather evanescent distally; female sternite 8 very elongate, thin distally.

Description. Male. Frons wider dorsally, narrower near antenna where it is as large as anterior ocellus width. Face as wide as frons near antenna. 2 pairs of ocellar setae. Postgena with 3 strong setae as strong as dorsal thoracic setae. Antennae with pedicel rather yellow; flagellum trisegmented. Palpus brown. Thorax black. 3–4 antepronotal setae as strong as adjacent thoracic setae; 3–4 proepisternal setae rather strong; 3 notopleural setae. Legs, predominantly yellow with apex of hind femur, apex of mid tibia, entire hind tibia and hind tarsus, black; fore and mid tarsi rather yellow with distal tarsomeres 4–5 darker. Fore tarsomeres 1–2 rather yellow banded medially. Slightly stronger setae: mid femur with 1 anterior stronger near apex; mid tibia with 2 anterodorsal, 2 posterodorsal, 2 posterior along basal half, 1 ventral near middle; hind femur with 2 anterior at basal fifth and at distal fifth; no anteroventral setae. Slender setae: hind tibia with 4 dorsal. Wing brown­infuscated along costal cell, pterostigma and slightly at apex of cell r2+3; cell dm rather truncate; M1, M2 and A1 rather evanescent distally. Halter whitish. Terminalia ( Figs. 23–25 ). Tergite 8 ( Fig. 23 ) rather short, sinuous distally. Anterior cercus elongate with median internal protuberance; posterior cercus narrow with a very thin internal protuberance near base ( Fig. 24 ). Hypandrium ( Fig. 25 ) with no setae and with apex rather membranous.

Female. Frons wider than in male. Wing slightly more infuscated along costal and distal margin. Terminalia ( Figs. 26–28 ) with tergite 8 and sternite 8 very elongate; sternite 8 ( Figs. 26, 27 ) with lateral lobe near base and a small internal protuberance at distal third with apex thin and elongate. Genital fork ( Fig. 28 ) small, with small cleft distally, slightly wider at apex. Genital chamber membranous.

Size. Body 4.0– 4.1 mm; wing length 3.8–4.1 mm. Geographical distribution. Ecuador, Peru ( Fig. 40 ).

Material. Holotype ɗ: PERU, Cuzco, Quincemil, 1–15.xi.1962, L. Pena, 700 m (CNC). Paratypes. Same data as holotype (1Ψ CNC); 1–15.x.1962 (4Ψ CNC, 3Ψ INPA); Avispas, Madre de Dios, 10–20.ix.1962, L. Pena, 400 m (2Ψ CNC, 1Ψ INPA); ECUADOR, Napo, Coca, Napo R., v.1965, L. Pena, 250 m (2Ψ CNC).

Holotype condition. Terminalia in glycerine.

Etymology. The specific name is in honor of Mr Luis E. Peña who made significant contributions to entomology and collected the type series.

Variation. Ecuadorian specimens have darker coxae.

Discussion. M. penai is apparently most similar to M. nigriventris (Macquart) , described from Brazil, in that both have a rather short tergite 8, which is blunted in M. penai and bears two distal clefts in M. nigriventris . They differ in the shape of the male terminalia, mainly in the hypandrium, which is slender and without setae in M. penai and broad with distinct posterior setae in M. nigriventris .

Figures

FIGURE 40. Distributions of new species of Macrostomus. Symbols represent the known collection localities as follows: square = M. alpinus; diamond = M. ciliaticosta; circle = M. lineatus; star = M. occidentalis; triangle = M. penai; cross = M. tarsalis.

FIGURES 23 – 28. Macrostomus penai, n. sp., holotype ɗ and paratype Ψ. 23, male tergite 8, dorsal view, right setae not represented; 24, epandrium and cercus, lateral view; 25, hypandrium and phallus, lateral view; 26, female terminalia, lateral view; 27, female sternite 8, ventral view, left setae not represented; 28, female genital fork.