478 LIST OF DIPTERA. 



when they are joined together, and they have a slightly oblique band 

 on each side : chest beset with some black bristles on each side and 

 behind : abdomen linear, much narrower than the chest, less than 

 twice its length, clothed with very short tawny hairs ; sides and bor- 

 ders of the segments dull tawny ; under-side gray ; first and second 

 segments very short ; third and following segments long, successively 

 decreasing in length ; third, fourth and fifth segments crossed by 

 rows of black punctures: legs black, clothed with hoary hairs, 

 armed with black and white spines ; thighs and shanks red towards 

 the base, and this colour is most prevalent in the fore legs ; thighs 

 of the male rather thick ; shanks and feet covered beneath with 

 tawny down ; foot-cushions dull tawny : wings slightly tinged with 

 brown, widened on the fore border in the male ; wing-ribs piceous ; 

 veins black, ferruginous at the base ; poisers ferruginous. Length 

 of the body 7 lines ; of the wings 12 lines. 



a. ? From Mr. Children's collection. 



Ommatius Ademon, n. s. Niger, pectore piceo, antennis nigris, 

 pedibus ferrugineis, alls subtus basi limpidis. 



Body black, probably overspread with brown, gray or tawny 

 bloom, which is effaced in the specimen described : head a little 

 broader than the chest, clothed behind and beneath with white hairs, 

 beset with a fringe of black bristles on the crown and in front, where 

 it is covered with black down ; clypeus adorned with many bright 

 tawny bristles : eyes dark bronze colour ; fore part slightly convex, 

 composed of large facets, which diminish as they diverge, but the 

 boundary where they cease to decrease is distinctly marked: lip 

 black, short, tipped with tawny hairs; palpi black, clothed with 

 black hairs and bristles : feelers black; first joint clothed with black 

 hairs ; second joint shorter than the first, beset with black bristles ; 

 third joint oval, as long as the second ; fourth joint or the bristle 

 slender, as long as all the preceding joints, furnished with long 

 hairs : breast piceous : sides of the chest beset with pale yellow . 

 bristles : abdomen nearly linear, slightly convex, narrower than the 

 chest and nearly twice its length, thinly clothed with short pale 

 hairs : legs ferruginous, clothed with short pale yellow hairs and 

 beset with black spines and bristles ; feet also covered with black 

 hairs ; claws black ; foot-cushions tawny; fore legs unarmed: wings 

 pale brown, colourless towards the base, excepting the fore border ; 

 wing-ribs and veins piceous, the latter black towards the tips ; 

 poisers piceous. Length of the body 6 — 6i lines ; of the wings 

 11—1 li lines. 



