Toxorhina (Toxorhina) polytricha Alexander 1970

Toxorhina (Toxorhina) polytricha

Size small (wing of male to 4 mm); rostrum subequal in length to remainder of body; mesonotal praescutum with 4 light brown stripes, lateral borders broadly yellow; pleura yellow with a narrow dark brown dorsal stripe; wings weakly darkened, with sparse trichia on Rs and near outer ends of veins R5 and M1+2; male hypopygium with spine of basistyle slender, tip acute; dististyle with about 20 major setae on disk; arms of phallosome relatively short, separated by a distance subequal to their diameter.

MALE.—Length, excluding rostrum, about 4.5 mm; wing 3.5–4 mm; rostrum about 4.5 mm.

FEMALE.—Length, excluding rostrum, about 5.5–6 mm; wing 4–4.5 mm; rostrum about 4 mm.

Rostrum brownish black, in male subequal in length to remainder of body. Antennae with scape and pedicel dark brown, flagellum brownish black. Head gray; anterior vertex about twice the diameter of scape.

Cervical region brownish black. Pronotum brownish yellow. Mesonotal praescutum with 4 light brown stripes, the intermediate pair becoming obsolete behind, interspaces brownish yellow, humeral and lateral regions light yellow, posterior sclerites of notum dark brown. Pleura light yellow, with a narrow brown dorsal stripe. Halteres with stem obscure yellow, knob brown. Legs with all coxae and trochanters light yellow; remainder of legs light brown. Wings weakly darkened, prearcular field more yellowed; veins brown. Sparse trichia on outer ends of veins R5 and M1+2, with still fewer on Rs.

Abdomen with tergites light brown, more brightened laterally, subterminal segments slightly darker to form a narrow ring; sternites and hypopygium yellow. Male hypopygium (Figure 67) with spine of basistyle, b, slender, tip acute. Dististyle, d, with apex of blade obtuse; disk below the darkened tubercle with unusually abundant major setae, to about 20 in number, the more basal ones paler, long and slender. Phallosome, p, with arms relatively short, separated by a space subequal to their own diameter.

Holotype, male, 321.8 m (0.2 mile) east of Pont Casse, Dominica, 8 April 1966 (Gagné). Allotype, female, Fond Figues River, 13 March 1965, light trap (Wirth). Paratopotypes, 4 males and females, 4,828 m (3 miles) east of Pont Casse, 13–16 October 1966 (Gurney). Paratypes, female, Clarke Hall, 21–31 January 1965, at light (Wirth). Fond Figues River, 13 March 1965 (Wirth). G’leau Gommier, 17 March 1956 (Clarke).

The most similar species are Toxorhina (Toxorhina) carunculata, new species, and T. (T.) subfragilis, new species most readily separated by the characters provided in the key.

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Toxorhina polytricha là một loài ruồi trong họ Limoniidae. Chúng phân bố ở vùng Tân nhiệt đới.