168 Orthorrhapha brachycera. 



tarsal joints longer than broad; hind tibiæ slightly compressed, some- 

 what curved in the middle. 



Length 3,5—4,5 mm. 



This species is very similar to quadrivittata, but it is distinguished 

 by the quadriserial acrostichal bristles, the black upper part of the 

 occiput, and also the hairs and bristles on the legs show differences, 

 as seen from the description. 



H. Beckeri is rare in Denmark, and it has first quite recently been 

 known as belonging to our fauna, as the first specimens were taken 

 in 1909, and it was again taken in 1910; Dyrehaven at Røde Bro 

 (the author), Fure Sø (Wesenberg-Lund) and in Jutland at the spring 

 at Ravnkilde (J.P.Kryger); my dates are '^^li — '^^U. At Fure Sø it was 

 taken on Phragmites. 



Geographlcal distribution: — Northern and middle Europe down 

 into Carinthia; it is not known north of Denmark. 



Remarks : H. quadrivittata in Zetterstedt is certainly not the pre- 

 sent species but carinthiaca (see under this species). 



16. H. carinthiaca Strobl. 



1892. Strobl, Verh. zool. bot. Geseli. Wien, XLII, 144, 33. — 1903. 

 Kat. palåarkt. Dipt. II, 249. — Hilara quadrivittata (non Meig.) : 1842. Zett. 

 Dipt. Scand. I, 339, 5. 



Male. Vertex, frons and epistoma grey; frons somewhat narrow; 

 palpi grey with black hairs. Occiput black, but from the vertex a 

 bluish grey triangle stretches down the occiput, with the point down- 

 wards; the hairs are black and chiefly present at the eye-margin; 

 downwards the hairs are more brownish. Thorax grey, somewhat 

 slate-coloured, with four dark brown and somewhat shining stripes, 

 the median abbreviated behind, the lateral in front; the former are 

 distant, the latter near to them. The dorsocentral and acrostichal 

 bristles short, black; the former uniserial, longer behind, the latter 

 quadriserial. Further a small humeral bristle, a posthumeral, two 

 notopleural, a supraalar and a postalar bristle, all black. Pleura 

 grey. Scutellum with four black marginal bristles. Abdomen dark, 

 almost blackish grey; with the light from behind it shows broad, 

 lighter anterior margins to the segments; it is blackish haired and 

 with black marginal bristles on the segments; in front the hairs are 

 yellowish. Venter dark grey, short-haired. Exterior genitalia of 

 medium size, somewhat compressed, the lamellæ large, somewhat 

 shining, each terminating with a simple, truncate process; the lamellæ 



