LIST OF DIPTERA. 263 



towards the tips ; shanks yellow, beset with black bristles ; feet pi- 

 ceous : wings long, narrow, slightly gray, with a tawny tinge, which 

 disappears at the tips and along the hind borders ; wing-ribs and 

 veins piceous, the latter black towards the tips ; poisers tawny, 

 with yellow tips. Length of the body 4% lines ; of the wings 10 

 lines. 



b. South of France. Presented by F. Walker, Esq. 



Perhaps this species is A. Hesperus, Rossi, Meig. Dipt. ii. 

 165,36. 



Group XIII. 



Like the ninth group, but the vein that divides the first from 

 the second submarginal areolet springs from the first submarginal 

 vein. The specimen described has three submarginal areolets in 

 one of its wings. 



Anthrax argentifera, n. s. Nigra, capite piceo, peclore, scutello, ab- 

 dominis lateribus ventreque fcrrugineis, abdominis dorso fasci- 

 culis albis, antennis pedibusque nigris, alis limpidis basi costaque 

 ferrugineis. 



Allied to A. rivularis. Body black : head piceous, thickly 

 clothed with bright tawny hairs, black and clothed with white hairs 

 behind : feelers black, ferruginous at the base : sucker black : eyes 

 red : chest clothed with tawny hairs ; breast ferruginous and clothed 

 with yellow hairs ; scutcheon dark ferruginous : abdomen ferrugi- 

 nous on each side and beneath, and having a band of white hairs 

 on the fore border of each segment, and a tuft of white hairs on each 

 side at the base : legs black and beset with black bristles ; thighs 

 dark ferruginous : wings colourless, dark ferruginous at the base 

 and along the fore borders for three-fourths of the length ; this 

 dark colour is irregular in outline on the disks of the wings, and 

 runs along the borders of some of the veins, leaving the areolets al- 

 most colourless ; wing-ribs and veins piceous, the latter black to- 

 wards the tips ; poisers ferruginous, with tawny knobs. Length of 

 the body 5 lines ; of the wings 12 lines. 



Group XIV. 



Like the ninth group, but the first submarginal vein has its 

 source near the base of the wing, and is straight till near its tip. 



