Lactistomyia minuta, Ale-Rocha, Rosaly, 2008

Ale-Rocha, Rosaly, 2008, Revision of the Neotropical genus Lactistomyia Melander (Diptera, Hybotidae, Hybotinae), Zootaxa 1692, pp. 1-25 : 11-12

Lactistomyia minuta sp. n.

( Figs. 20–24 , 58 )

Diagnosis. Scutum with dorsal square shiny are on anterior third; wing hyaline, slightly brownish on basal quarter, stigma hyaline; hind femur strongly swollen, with 11 anteroventral strong elongate spines inserted on weakly developed tubercles, ventral surface nude, flat and wide with 12 posteroventral spines shorter and 3 posterior spines near base; hind tibia straight with anterior surface flattened on basal half and ventral surface sharpened; hypandrial lobe reduced with preapical digitiform process on left side.

Holotype male. Body: 4.6 mm. Wing: 3.3 mm.

Description. Antenna brown; pedicel with elongate bristles, reaching the half of postpedicel; postpedicel about twice longer than wide, equal to the scape and pedicel combined; arista twice length of antenna. Face narrow, black with pale brown pruinescence. Palpus brown; proboscis brown. Ocellar setae elongate, parallel and erect. Postcranium dark brown with brown pruinescence; upper postocular setae brown, long, thin and scattered; occipital setae short, scattered and some setae on the margin of the buccal opening and foramen.

Thorax with rust colored pruinescence, less dense on pleurae; scutum black with dorsal square shiny area without pruinescence on anterior third; pleurae dark brown. Anterior bristles yellow and weak, posterior bristles brown and strong; pronotum with marginal bristles biserial in the middle, disordered and more numerous laterally; 1 robust npl; 1 darker stronger pal; scutellum with 1 preapical pair robust, very long, convergent, 1 long and thin apical pair about two-thirds length of preapical pair and 3 thin lateral bristles about one-half length of preapical pair.

Fore and mid legs, hind tibia and tarsus brown; hind coxa, trochanter and femur dark brown to black. Fore and mid tibiae with long and thin bristles on posterior surface; fore and mid tarsomeres 1 and 2 with brown, elongate and dense pilosity on anteroventral, ventral and posteroventral surfaces, longer on tarsomere 1. Hind femur strongly swollen. Hind tibia straight with anterior surface flattened on basal half and ventral surface sharpened ( Fig. 24 ); hind tarsus slightly more than one-half length of tibia, tarsomere 1 slightly longer than following tarsomeres combined, tarsomeres 2–4 very short. Outstanding bristles: fore tibia without strong bristles; fore and mid tarsi bristly, fore tarsus with 1 dorsal bristle in the middle and 1 black, long and thin, preapical dorsal bristle on tarsomere 1; mid tibia with 4–5 anterodorsal black and short bristles, some short preapical bristles, 1 long ventral bristle reaching half of tarsomere 1; mid tarsus with 1 dorsal in the middle and 1 dorsal preapical bristle of medium length and 1 posteroventral sub-basal bristle as long as tarsomere 1; hind trochanter with 2 black, short and strong ventral spines; hind femur with 11 black, elongate and strong anteroventral spines inserted on tubercles weakly developed, 12 posteroventral spines shorter, posterior surface with 3 short and thin spines near base, ventral surface flat and nude; tarsomere 1 with black strong spines on anteroventral surface and 1 short apical spine on tarsomeres 2 and 3.

Wing ( Fig. 58 ): hyaline, slightly brownish on basal quarter; stigma hyaline, R4+5 and M1 convergent; anal lobe wide.

Abdomen: dark brown with rust colored pruinescence on all segments. Bristles pale brown, long laterally and very short dorsally, Tg1 and Tg2 with lateral bristles distinctly longer; sternites with short bristles. Terminalia: hypandrium short, not reaching the margin of left epandrial lamella; hypandrial lobe reduced with preapical digitiform process on left side ( Fig. 20 ); epandrial lamellae with strong and short preapical bristles, shorter than half length of lamella ( Fig. 21 ); right surstylus wide and triangular, left surstylus narrow and rectangular ( Figs.22, 23 ).

Female: unknown.

Type material. Holotype male ( INPA): “ BRASIL. Amazonas, Manaus, Reserva 1208 (Reserva Gavião), PDBFF /WWF, 14–18.vii.1995, Malaise, Bert Klein”. Condition: good, not dissected. Paratypes: BRASIL. Amazonas, Manaus, PDBFF, Reserva 1210, 01–15. viii.1985, 1 male ( INPA); Reserva 1208, 19.ix.1986, 1 male ( INPA); Reserva 1210, xii.1985, 1 male ( INPA).

Distribution: Brazil (Amazonas).

Etymology. The specific name is derived from the Latin minutus (little, small) in reference to the size of the body.

Figures

FIGURES 20 – 24. Lactistomyia minuta, sp. n. Male: 20, 21, hypopygium, ventral and dorsal view; 22, 23, left and right surstyli; 24, hind leg. Figs 20 – 23 in the same scale. Scale bar = 0.5 mm.

FIGURES 54 – 63. Wings of Lactistomyia. 54, L. hyalina; 55, L. insolita; 56, L. lepida sp. n.; 57; L. mammifera; 58, L. minuta sp. n.; 59, L. nigripes; 60, L. paranaensis sp. n.; 61, L. pulchra sp. n.; 62, L. serrata; 63, L. tuberculata sp. n.