ASILUS. 4'J 



with long black liairs. Thorax tinged with white on each side. Wings 

 bro\ATiish-grey, pale grey towards the base. Halteres bright yellow. 

 Abdomen bronze-black, with a slight purple tinge, clothed with short 

 tawny hairs; hind borders of the segments covered on each side with 

 tawny down. Legs clothed with tawny hairs and black bristles ; 

 onychia tawny. Male. Abdominal appendages large, black, clothed 

 with black hairs. 



Not common. (E.) 



Genus II. ASILUS. 



ASILUS, Mg. kl. (1S04) ; LI. ; Fhl. ; Wd. ; Mq. ; Ztt. ; Ct. ; Lw.— ^Ai- 

 lus \).,1j.; Fb. ; Dg. ; Gm. ; Slii'. ; Gfr. ; Hbst. Dasypogon ^.,Yh. 



Corpus majoris aut medife magnitudinis, elongatuni, hirsutum. Color 

 spepissime niger, hirsutie cinerascente ; raro lutescens. Oculi nni- 

 colores. Antennce 5-articulat?e, stylatse. Areola mediastinalh clatisa. 

 Tibicie piloses et spiniilosse. Onyclda conspicua. 

 Mas. Genitalia prominula ; cauda forficata cornea. 

 Fcem. Amis stylis 2 cornels acurainatus, productus. 



Body naiTow, cylindrical, bristly. Head rather small, semicircular, 

 transverse, much compressed between the eyes, with a small deeply de- 

 pressed front, very hairy beneath the mouth ; epistoma prominent, 

 beset with bristles. Eyes green. Ocelli 3, seated on a little tubercle. 

 Proboscis projecting, oblique, somewhat curved, as long as the head. 

 Labrum short, broad, arched^ obtuse, half the length of the labium, 

 coriaceous at the base, membranaceous and obliquely truncated at 

 the tip. Lingua stiff, flat, pointed, clothed above with reverted 

 velvet-like hairs, as long as the labium. Maxillae stiff, truncated, 

 linear, rather dilated and membranaceous towards the tips, ex- 

 ceeding the labiaim in length. Palpi cylindrical, clavate, obtuse, 

 hairy, cun'ed upwards. Labium thick, hairy, tumid beneath. 

 Antennae 5-jointed, porrect, stylate, hardly larger than the head, in- 

 serted in the middle of the face, approximate at the base, diverging, 

 inclined upward ; first and second joints bristly ; first cylindrical ; 

 second cyathiform, short ; third long, subulate, compressed, bare ; 

 fourth and fifth very short. Thorax most often with dark and some- 

 times divided stripes, of which the middle one is shortened in front, and 

 those on the sides are interrupted. Scutellum small. Wings lanceo- 

 late, very finely pubescent ; mediustmal areolet closed. Alulae small, 

 very narrow ; their borders fringed. Halteres long, uncovered. Ab- 

 domen with 7 segments, long, lanceolate ; hind part gradually tapering. 

 Legs stout, bristly ; tibiae straight, spinose. Onychia conspicuous. 



The Asili are more generally distributed tlian the other genera 

 of this family, and are most frequent in sandy situations ; their 

 VOL. I. n 



