Freraea. 119 



part; middle tibiæ in both sexes withoiit ventral bristle; claws and 

 pulvilli small in both sexes. Wings with first posterior cell open or 

 just closed, ending at apex of wing; discai vein only curved evenly 

 and slightly upwards so that no apical cross-vein is formed. No 

 costal spine and no bristles at base of cubital vein. 



The species is parasitic on Carabids and belongs probably to 

 Pantel's group 8. 



Only one species is known with certainty, also occurring in 

 Denmark; probably gagathea R. D. and nigripennis B. B. {Gymno- 

 phania) belong to the same species, if not so there would be three 

 species. 



1. F. albipennis Zett. 



1838. Zett. Ins. Lapp. 629, obs. — 1844. Zett. Dipt. Scand. III, 1258, 

 1, c^ (Gymmpeza). — 1916. Villen. Bull. Soc. Ent. de Fr. 259 {Gymnopeza). — 

 1924. Stein, Arch. f. Naturgesch. 90, 6, 241 {Gynmofeza). — Gymnopeza denu- 

 tata Zett. 1844. 1. c. III, 1258, 2, ?. — 1862. Schin. F. A. I, 422. — 1894. Pand. 

 Rev. Entom. XIII, 74. — 1907. Kat. palåarkt. Dipt. III, 560. — 1921. Baer, 

 Zeitschr. f. angew. Entom. VII, 394. 



Male. Frons above quite narrow, eyes nearly touching, the 

 frons almost not protruding, somewhat rounded in profile. Orbits 

 black above, downwards greyish silvery, in some lights blackish; 

 jowls blackish. The narrow frontal stripe velvet black. No vibrissæ 

 above the angular. Orbits with small hairs outside the frontal bristles, 

 and cheeks hairy, downwards the hairs in a row, jowls black-haired. 

 Occiput blackish, black-haired. Antennæ brown, short, third joint 

 about as long as second; arista bare. Palpi black, Thorax black 

 shining, black haired; only one hinder dorsocentral bristle, otherwise 

 no distinct bristles on the disc. Abdomen black, shining, fmely black- 

 haired, without bristles. Legs black, tibiæ, especially hind tibiæ a 

 little narrowed at base; the legs almost without bristles, only front 

 femora with fine dorsal and ventral bristles, and posterior femora 

 with some fine bristles ventrally on basal part. Wings yellowish 

 white, darkest towards anterior margin; veins yellow; first posterior 

 cell narrowly open or nearly closed at apex of the wing; discai vein 

 only curving slightly upwards, so that no apical cross-vein is formed; 

 posterior cross-vein rather near the medial cross-vein. Squamulæ 

 white. Halteres with yellow peduncle and blackish knob. 



Female. Somewhat difTerent; frons broad, broader than the 

 eye, flat and more protruding than in male; orbits black, broad, 



