DASYPOGON. 57 



niger, abdominis pictura saepe albo-maculata vel fasciata. Proboscis 



obliqua. Antenna quinque-articulata, stylate. Areola discoidalis 



aperta. Tibia? pilosae et spinulosae. Onychia conspicua. 

 Mas. Anus obtusus, subglobosus; lamellae scilicet laterales breves, 



corneas, convexae, genitale obtegentes. 

 Fcem. Anus acutior, mucronulatus, seu spiimlis brevibus semicirculum 



fingentibus posticis armatus. 



Body narrow, almost cylindrical. Head short, nearly semicircular, 

 as broad as the thorax, compressed in the front, which is broad ; epi- 

 stoma convex, beset with bristles ; underside and hind part of the head 

 hairy. Eyes green, elliptical. Ocelli 3, on the crown. Proboscis 

 porrect, oblique, as long as the head, or a very little longer. Labrum 

 small, very short, conical, flat, pointed, very slightly widened in 

 front, clothed above towards the tip with thick, retracted hairs. 

 Lingua long, acute. Maxilla? long, linear, flat, pointed, submem- 

 branaceous towards the tips. Palpi biarticulate, short, hairy, of 

 various form. Labium large, tumid, narrow at the base, chan- 

 nelled above, hairy beneath and at the obtuse tip. Antenna? porrect, 

 5 -jointed, stylate, inserted in the middle of the face, as long as the 

 head, approximate at the base, diverging, inclined upward ; first and 

 second joints hairy, almost equally long, subcylindrical, somewhat more 

 slender at the base ; third lengthened, pubescent, compressed, some- 

 what smaller at each end ; fourth very short ; fifth like a style. Thorax 

 oval, very convex ; scutellum rounded. Wings moderately broad, ob- 

 tusely lanceolate, very finely pubescent; mediastinal areolet open. 

 Alulae small, entire. Halteres uncovered. Abdomen with 7 segments, 

 cylindrical, convex, in some species slightly depressed ; first segment 

 short, arched ; tip obtnse. Legs stout, bristly ; tibiae straight. Onychia 

 conspicuous. 



The habits of the insects of this genus are similar to those of 

 the Asili, and the species are more peculiar to warm regions. 

 The two British species are comprised in the following groups 

 or subgenera of Loew : 



a. Tips of the fore tibiae armed with spines. DASYPOGON, Species 1. 

 a a. Tips of the fore tibiae without spines. ISOPOGON, Species 2. 



1. punctatns, Fb. s. i. ii. 463. 15 (1781) ; Gm. ; Pz. ! fh. xlv. 

 24; LI.; Mg.; Mq.; Zll. diadema, Fb.; Gm.; Pz. ! fn. xlv. 23; Lw.~ 

 nervosus, Pz. fh. cv. 9 ; Mg. Ater, capite antico albo-pnbescente ; 

 Mas. epistomate nigro-setoso, alis nigris ; Fcem. epistomate albo-setoso, 

 alis subcinereis apice fuscis, abdominis lateribus albo-maculatis apice 

 rufo. Long. 9-11 ; alar. 16-19 lin. 



Black. Front of the head clothed with white shining down. Male . 

 Epistoma beset with black bristles. Wings black, paler along the hind 

 borders. Fern. Epistoma beset with white bristles. Wings pale grey ; 

 their tips tinged with brown. A row of white spots along the sides 



VOL. I. j 



