Scenopinidae. 159 



Of the genus 14 species are known from the palæarctic region; 

 2 species have hitiierto been found in Denmark. 



Tahle of Species. 

 1. Eyes touching in the male, separated in the female; legs 



ferrugineous 1. fenestralis. 



— Eyes separated in both sexes ; legs black or blackish, only 



the tarsi yellow; hind tibiæ in the male thickened 2. niger. 



1. S. fenestralis L. 



1761. Linn. Fn. Suec. 1845 (Musca). — 1844. Zett. Dipl. Scand. III, 

 895,1 et 1849. VIII, 3197,1 et 1859. XIII, 6044,1.-1862. Schin. F. A. 

 I, 159. — 1903. Kat. palaarkt. Dipt. II, 216. 



Male. Eyes touching, dark brownish, slightly metallic, with the 

 facets on the upper two thirds larger than below, on the dividing 

 line a purplish band. Frons greenish black, slightly metallic, with 

 sparse, depressed hairs; in the middle an impressed, longitudinal line. 

 Antennæ black. Thorax brownish metallic, rugosely punctate, clothed 

 with short, depressed, greyish yellow hairs; on the front part traces 

 of two duU stripes; the humeral cailus often more or less brownish 

 yellow. The hind part of the pleura glabrous and shining. The hind 

 margin of the scutellum on the under side often more or less brownish 

 or even whitish. Abdomen black, somewhat shining, fmely punctate 

 and sparingly clothed with very short, dark hairs; in the middle of 

 the large second segment there are two curious, more or less round, 

 rugosely punctate impressions; at the hind margin of the third, fourth 

 and fifth segments a white, transverse stripe (the connecting membrane), 

 often more or les hidden. The genitalia with yellow hairs. Venter 

 black, somewhat shining, fmely punctate. Legs ferrugineous, the hind 

 femora and tibiæ often more or less darkened in the middle, the tarsi 

 darkened towards the ends. Wings hyaline slightly brownish tinged, 

 broadly brown along the subcostal vein; veins blackish brown. Bal- 

 teres with the peduncle brown, the knob white. 



Female. Eyes with the purplish band lying in the middle. Frons 

 rugosely punctate, along the eye-margins glabrous and shining, and 

 with an impressed middle hne; along the posterior edge of the eye 

 a broad margin. The abdominal incisures brown, not white. 



Length 4 — 6 mm. 



This species varies somewhat and varieties have been described 

 as separate species many times and under many names. As seen 

 from the description it varies somewhat in colour; it varies a good 

 deal also with regard to the venation of the wing, -the radial vein 

 sometimes stopping suddenly before the margin; the upvards bent 



