AS1LUS. 49 



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

 brownish-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. (1804) ; LI. ; Fin. ; Wd. ; Mq. ; Ztt. ; Ct. ; Lw. Asi- 



lusp., L.; Fb.; Dg. ; Grm. ; Shr. ; Gfr. ; Hbst. Dasypogon p., Fb. 

 Corpus majoris aut mediae magnitudinis, elongatum, hirsutum. Color 



saepissime niger, hirsutie cinerascente ; raro lutescens. Oculi uni- 



colores. Antenna 5 -articulate, stylatae. Areola mediastinalis clausa. 



Tibiae pilosae et spinulosae. Onychia conspicua. 

 Mas. Geiiitalia prominula ; cauda forficata cornea. 

 Fcem. Anus stylis 2 corneis acuminatus, productus. 



Body narrow, 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 labrum in length. Palpi cylindrical, clavate, obtuse, 

 hairy, curved 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 ; mediastinal 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 than the other genera 

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



VOL. i. H 



