156 Ortlionluipha l)racliyicra. 



tliere are small spiraclcs on prothorax, and |the larva is thus amphi- 

 pneustic. It is 8 — 'J min. long. 



The larva was found in woods in Ihe earth under Hypnntn on 

 rocks. 



The species of PtioUnu seem rather rare; 10 species belong to 

 the palæarctic region, only one has hitherto been ibund in Denmark. 



1. P. obscura Fall. 



1814. Leptis, Fall. Dipt. Suec. Anthrac. U, II. — IS4;2. Zett. Dipt. 

 Scand. 1, 227, p. p. — 1900. Becker, Enlom. Nachricht. XXVI. 111. — 

 1903. Kat. palåarkt. Dipt. II, 89. 



Male. Front blackish, cheeks and yowls soniewhat reddish brown, 

 thc latter brownish haired, the cheeks with a rovv of a few hairs. 

 Antennæ brownish black, the basal joints with very short hairs; palpi 

 brown. Thorax velvet black, unstriped or indistinctly striped; pleura 



Fig. 47. Wing of Pt. obscura. 



and sterna brownish; the thoracic disc clothcd with soiviewhat longish, 

 dark brown hairs. Abdomen velvet black or brownish black; venter 

 brownish. Abdomen clothed with long, blackish brown hairs. Legs 

 brown; femora and hind tibiæ rather long haired, the anterior tibiæ 

 short haired. Wings brownish fumigaled with brown veins; stigma 

 long, brownish; the Iwo first veins rising from the discai cell connected 

 at the base. Balteres brown. 



Female. Front broad, brown or greyish brown : the basal joints 

 of the antennæ paler than in the male. Thorax brown with three 

 darker, longitudinal stripes thai are often indistinct. Abdomen brown, 

 slightly shining. 



Length 3,5 — 4,5 mm. 



As said in thc description the species has some few, but distinct 

 hairs on the cheeks, and it is thus not conform with Becker's descrip- 

 tion 1. c, as he says: ,Wangen braun nackt", but in other respects 

 it agrces well: I sent my species to. Becker, and he determincd it as 

 obscura Fall. The original specimen.< he has seen have had, I think, 

 the cheeks rubbed and obscura has in reality sparingly but distinctly 

 haired cheeks. Zetterstedt does not record obscura from Denmark. 



