March, I9i6.] ScHAEFFER : New DiPTERA. 69 



Asilus fulviventris new species. 



Head densely clothed with yellowish-gray pollen ; beard white ; niystax 

 yellowish-white with a few black hairs above ; ocellar bristles white ; occipito- 

 orbital bristles black ; palpi black with white hairs. Thorax densely covered 

 with yellowish-gray pollen ; dark median stripe prominent, divided by a narrow 

 line; pleurae densely grayish-white pollinose and with a few white hairs. Scu- 

 tellum almost without any hairs, four apical bristles pale. Wings glassy hya- 

 line. Abdomen, except the first and second segment, which are grayish-white 

 pollinose, densely and uniformly covered with fulvous pollen, apical margins 

 paler, hairs and bristles at sides concolorous ; last segment and hypopygium 

 shining black, the latter with a few white hairs. Legs uniformly black, cov- 

 ered sparsely with white hairs and white bristles. Length ii mm. 



One male, Huachtica Mts., Arizona (Schaeffer). 



The imiformly colored fulvous abdomen, contrasting with the 

 greyish-white pleurae and the entirely black legs with white hairs and 

 bristles ought to make this neat little species easy recognizable. 



Ommatius parvulus new species. 



Head white pollinose, beard white, mystax yellowish-white with a few 

 black hairs above; antennas black; palpi black with white hairs. Thorax dull 

 blackish-brown and marked nearly as in inargincllus. Pleurae densely white 

 pollinose with a few white hairs. Wings hyaline, apex slightly smoky, ^costa 

 not thickened nor dilated. Abdomen black, sides and apical margins of seg- 

 ments gray pollinose and very sparsely covered with'short, white hairs. Hypo- 

 pygium black, claspers truncate at apex. All the femora black, covered sparsely 

 with white hairs, which are a little longer on front and middle than on hind 

 femora, the latter beneath with a few white, spine-like bristles ; tibiae yellowish, 

 at tip black, tarsi, except the first joint, black. Length 9 mm. 



Huachuca Mts., Arizona (Schaeffer). 



This species differs from O. macuJatus Banks in having the thorax 

 dull, not shining and the hypopygium black, and from O. prctiosus 

 Banks by the blackish abdomen and the hind femora of the male with 

 spine-like bristles beneath. 



