Asilidae. 



73 



there is no excision; the ventral lamella is black; the genilalia are 

 clothed with somewhat strong, yellowish hairs. Legs black, only rufous 

 at the outermost base of the tibiæ, but this colour is often indistinct 

 or wanting; coxæ slightly brownish grey pruinose with long whitish 

 hairs; the hairs on the legs somewhat long, pale yellowish and giving 

 the black legs a greyish appearance. 

 Long, thin hairs are found on the 

 ventral and posterior sides of the 

 femora and on the ventral side of 

 the tibiæ; a row of them on the 

 ventral side of the front femora are 

 strong and bristly, and likewise some Fig. ^26. D. trigonus, male forceps. 

 below the hind femora; they are to a great degree yellow, but the 

 bristly ones on the front femora and below the hind femora as also 

 most on the tibiæ are black. Spine-like bristles are found on the 

 ventral and front sides of the posterior femora, on the dorsal and 

 posterior sides of the front tibiæ and on the various sides of the 

 posterior tibiæ except on the posterior side of the hind tibiæ, finally 

 as usual some apically on the posterior femora; on the ventral side 

 of the front femora none are found; they are for the most part yel- 

 low, on the ventral side of the femora, especially the middle femora, 

 and on the dorsal side of the tibiæ they are generally more or less 

 black. The spine-like bristles on the tarsi are black and yellow 

 intermingled. Wings hyaline, slightly yellowish, especially along the 

 veins; veins brown. Balteres yellowish. 



Female. Agreeing with the male but the abdomen still more 

 compressed and wedge-shaped upwards. The ovipositor black, broad 

 and strongly compressed; the 

 upper margin is slightly con- 

 cave, the lower margin very 

 convex; the second dorsal 

 piece is more than one third 

 of the length of the first; the 

 first dorsal piece is punctate 

 on its apical half, the second 

 is punctate all over, the lower 

 piece is very densely punctate 

 on its apical half; the lamellæ ^ig. 27. D. trigonus, female ovipositor. 



are almost rhomboidal, punctate; the ovipositor is sparingly clothed 

 with short hairs, below there are some longer, yellowish hairs. 



Length 10 — 16 mm. 



The pupa has a length of 15 mm. (a large specimen); it quite 



