48 AsiLiD.f;. 



Mas. Abdomen angustius ; laraellse 2 magna? corneae genitalia supra 



tegentes. 

 Fcem. Abdomen latius, magis obtusum ; lamellae anales nuUte. 



Body rather large, stout, hairy, bristly. Head contracted, flat, very 

 hairy, as broad as the thorax; epistoma prominent, bristly. Eyes 

 green, flat, and composed of large facets iu front. Ocelli 3, on a little 

 tubercle of tbe crown. Proboscis almost horizontal, about twice the 

 length, of the head. Labrum short, conical, channelled beneath some- 

 what membranaceous at the tip. Lingua small, pointed, as long as 

 the labium, beset above with stiff", thick, revolute hairs along two- 

 thirds of the length to the tip. Maxilla? small, pointed, flat, 

 late, cylindrical, short, hairy ; joints of equal length. Labium 

 fringed internally, almost as long as the lingua. Palpi biarticu- 

 cylindrical, with a tubercle beneath at the base. Antennae porrect, 

 triarticulate, not stylate, approximate at the base, diverging, inclined 

 upward to the height of the head ; first and second joints bristly ; first 

 cylindrical ; second small, cyathiform ; third long, bare, subfusiform, 

 compressed, narrow at the base, somewhat dilated in the middle, obtuse 

 at the tip, much longer than the first and second. Thorax oval, 

 rather gibbous ; scutellum seinicircidar. Wings lanceolate, minutely 

 wrinkled, very finely pubescent ; mediastinal areolet closed before the 

 border. Halteres uncovered. Abdomen with 7 segments ; seventh 

 segment very small. Legs stout, hairy ; femora thick ; tibiae curved ; 

 tarsi rather long ; ungues long ; onyclda conspicuous. 



Male. Abdomen almost cylindrical, inflected beneath ; tips armed 

 with stout hairy pincers. 



Tern. Abdomen obclavate, obtuse. 



These flies appear in summer, inhabit woods, and their larvae 

 live and change to pupae in the decayed branches. The head, 

 the thorax, the rudiments of the wings, and eight segments of 

 the abdomen are distinctly formed on the outside of the case. 

 The head and the thorax are smooth, and there are a few 

 bristles on the sides of the abdomen. There are four large 

 and four small spines on the head, and the tip of the abdomen is 

 armed with eight spines, which are close together. The back 

 of each segment of the abdomen is beset with a transverse row 

 of small spines. 



1. marginata, L. s. n. ii. 1008. 10 (1763); Dg. ; Shr. ; Gm. ; 

 rb. ; Fin. ; Mg. ; Mq. ; ZU. ; Ztt. ; \m.— nigra, Mg. ; Ct. ! b. e. ii. 

 94. — -fulf/ida'^ Mg. Nigra, fulvo-hirta, capite aureo, alis fusco-cinereis 

 basi subcinereis, abdomine pm'pureo-nigro-aeneo. Long. 5-6 ; alar. 

 8-10 lin. 



Black. Head partly gilded, clothed with long black hairs, and in 

 front with tawny hairs. First and second joints of the antennae clothed 



