148 Orthorrhapha brachycera. 



22. Acrostichal bristles morethan biserial; front metatarsi 



in the male thickened 23. 



— Acrostichal bristles biserial; front metatarsi in the 



male simple 24. 



23. Thorax grey; balteres yellow 21. gallica. 



— Thorax blackish grey; balteres with yellow peduncle 



and dark knob 22. lurida. 



24. Thorax grey with two stripes; balteres yellow; eyes 



in the male narrowly separated 24. cingulata. 



— Thorax black, shining; balteres dark (or yellow in 



the female) ; eyes in the male contiguous 25. ffavipes. 



25. Thorax grey, with one stripe or unstriped; acrostichal 



bristles quadriserial 20. litorea. 



— Thorax blackish brown; acrostichal bristles biserial. 23. lasiopyga. 



In the table I have placed H. aeronetha in the group with yellow 

 balteres; according to Mik and Strobl this species niay vary with 

 dark balteres. 



1. H. cornicula Loew. 



1873. Loew, Berl. ent. Zeitschr. XVII, 42, 31. — 1892. Strobl, Verh. 

 zool. bot. Gesell. Wien, XLII, 105, 1. — 1903. Kat. palåarkt. Dipt. II, 250. 



Male. Vertex and frons velvet black, tbe latter shining in tbe 

 middle; epistoma more greyisb; palpi brownisb with brown hairs. 

 Occiput duU black, with blackish, downwards with pale hairs. Antennæ 

 black. Thorax black, shining. The dorsocentral and acrostichal 

 bristles of some length, black or blackish, the former uniserial, and 

 long behind, the latter quadriserial but just in front bi- to triserial. 

 Further a humeral bristle, a posthumeral, about three notopleural, a 

 supraalar and a postalar bristle, all black. Scutellum 

 with four black marginal bristles, the inner strongest. 

 Pleura grey pruinose. Abdomen black, shining, with 

 black hairs; at the hind margin of the segments longer, 

 bristly hairs. Venter similarly coloured and haired. 

 Exterior genitalia somewhat large, compressed, with a 

 httle longer hairs above. Legs black or blackish; coxæ 

 grey pruinose. The femora, especially the hind femora, 

 with fine hairs above and below; middle femora with 

 some longer, more bristly hairs on the anterior side; 

 front tibiæ with fine hairs and some slightly longer 

 hairs on the dorsal side; hind tibiæ with two rows of 



ri"'. 48 H covni- 



ciila, front leg. bristly hairs on the dorsal and anterior side. Front 



X 30. metatarsi somewhat thicker than the end of tibiæ, slightly 



shorter, about three fourths or more of the length of tibiæ^ and nearly 



as long as the four following joints, generally with one or two bristly 



