Lactistomyia lepida, Ale-Rocha, Rosaly, 2008

Ale-Rocha, Rosaly, 2008, Revision of the Neotropical genus Lactistomyia Melander (Diptera, Hybotidae, Hybotinae), Zootaxa 1692, pp. 1-25 : 7-9

Lactistomyia lepida sp.n.

( Figs. 7– 14 , 56 )

Diagnosis. Scutum with narrow, grayish pruinose dorsocentral stripe on anterior two-thirds; wing sub-hyaline, evenly infuscated, stigma and apex of the costal cell brown; hind femur thickened with 17 elongate and strong anteroventral spines inserted on slightly protuberant basal tubercles; ventral surface wide, flattened, nude, 2 sub-basal spines, 17 posteroventral spines with the 4 apical spines more ventrally located; hind tibia tubular, slightly arched; hypandrial lobe widened.

Holotype male. Body: 6.0 mm. Wing: 5.4 mm.

Description. Antenna brown; pedicel with elongate setae reaching the half of the postpedicel; postpedicel about twice longer than wide, as long as scape and pedicel together; arista 2.6 times length of antenna. Face narrow, black with brown pruinescence. Palpus brown; proboscis pale brown. Ocellar setae slender, long, erect and slightly divergent. Postcranium dark brown with grayish brown pruinescence; postocular setae yellow, long and weak; occipital elongate and weak, present on lower two-thirds.

Thorax with rust colored pruinescence; scutum and pleura black, anterior two-thirds of the scutum with a dorsocentral narrow stripe with grayish pruinescence. Bristles gold, abundant, weak, short anteriorly, long laterally and on prescutellar disc; pronotum with marginal bristles biserial in the middle, disordered and more numerous laterally; 2 robust npl; 1 long and slightly differentiated pal bristle; scutellum with 1 preapical pair long, thin and parallel, 1 apical pair and 3 thin lateral bristles about one-half to one-third length of preapical pair ( Fig. 7 ).

Fore and mid legs pale brown except coxae, trochanters, tarsomeres 3–5 and basal ½ of the fore femur brown; hind leg with coxa, trochanter, base of femur and tarsomeres 3–5 dark brown to black, distal one-fifth of femur, tibia and tarsomeres 1 and 2 pale brown. Bristles thin, short except the fore and mid tibiae with long bristles on posterior surface, longer in the mid tibia and hind femur with elongate bristles; bristles yellow except the outstanding bristles of the hind femur, brown. Hind femur slightly swollen. Hind tibia tubular slightly arched, 1.5 times length of tarsus ( Fig. 12 ). Fore and mid tarsi the same length of respective tibia; hind tarsomere 1 slightly longer than the following segments combined. Outstanding bristles: fore tibia with 1 anterior and 1 posterior preapical short yellow bristles; fore tarsus without outstanding bristle; mid tibia with 4–5 strong anterodorsal bristle, 1 long ventral apical bristle, reaching the half of tarsomere 1, plus some shorter apical bristles; mid tarsomere 1 with 1 dorsal sub-basal, 1 anterodorsal preapical and 1 sub-basal posteroventral long and strong bristles, hind trochanter with 1 brown, short and strong ventral spine; hind femur with 17 elongate black, strong anteroventral spines, shorter close of the apex of femur, with the bases slightly protuberant, ventral surface flat, nude, with 2 sub-basal spines, posteroventral row with 17 not aligned spines and the apical four more ventrally positioned; hind tarsomere 1 with 4–5 anteroventral short spines and 1 apical spine on tarsomere 2.

Wing (fig. 56): sub-hyaline smoothly infuscate, stigma and apex of the costal cell brown, costal cell as wide as R1; R4+5 and M1 slightly convergent, almost parallel; anal lobe wide.

Abdomen dark brown, with dense rust colored pruinescence in all the segments except posterior margin of Tg1 without pruinescence. Bristles yellow and thin, short dorsally and long on lateral margin, distinctly longer on Tg1–Tg3; sternites with longer, thin and scattered bristles on distal margin of sclerites. Terminalia: hypandrium broad, medium length, not surpassing the margin of the left epandrial lamella; hypandrial lobe short, about one-fourth length of basal portion of the hypandrium ( Fig. 8 ); epandrial lamellae with preapical bristles shorter than half of the length of the respective lamellae ( Fig. 9 ); surstyli short, left surstylus three pointed, right surstylus deep split distally ( Figs.10, 11 ).

Female: as in the male except for the pruinescence of the scutum slightly more grayish anteriorly as well as the dorsocentral grey pruinose stripe more evident; hind femur slender than in the male, with 16 anteroventral spines slightly dislocated ventrally, posteroventral row with 5 spines close of the apex and 5 on basal third, the most basal spine positioned more ventrally. Terminalia: ovipositor short, tergite and sternite 8 entire ( Figs. 13, 14 ).

Type material. Holotype male ( MZSP): “ BRASIL, Rio de Janeiro (Estado do Rio), Itatiaia, Maromba, ix. [1]946, Barreto col.” Paratypes: BRASIL, Minas Gerais, Arceburgo, xii.1946, M.P. Barretto col, 2 males (1- INPA; 1- MZSP), 1 female ( MZSP); Rio de Janeiro, Itatiaia, Maromba, ix. [1]946, Barreto col, 4 females (2– INPA; 2- MZSP); Paraná, São José dos Pinhais, Serra do Mar, BR 277, Km 54, viii.1884, A. Yamamoto, 2 females, 1 male ( INPA); x.1984, 1 male ( INPA); ix.1984, 1 male, 1 female ( INPA); viii.1984, J. A. Rafael, 3 males, 2 females ( INPA); 17.xi.1986, Lev. Ent. PROFAUPAR, Malaise, 2 males (1- INPA, 1- UFPR).

Condition of the holotype: good, not dissected; right wing lost.

Distribution: Brazil (Minas Gerais, Rio de Janeiro, Paraná).

Remarks. This species is very close to L. paranaensis and it is distinguished of the last by slightly arched tibia and characters of the male terminalia.

Etymology. The specific name is derived from the Latin lepidus (pleasant, elegant) in reference to the general aspect of this species.

Figures

FIGURES 7 – 14. Lactistomyia lepida, sp. n. Male: 7, scutellum; 8, 9, hypopygium, ventral and dorsal view; 10, 11, left and right surstyli; 12, hind leg. Female terminalia: 13, 14 dorsal and lateral view. Figs. 8 – 11; 13, 14 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.