Craspedothrix. 455 



marginal bristles on each side, the apical more or less small. Four 

 sternopleural bristles, but only two of them large. Pteropleiira with 

 a somewhat large bristle above. Abdomen ovate; genitalia smaller 

 or larger; excavation on second segment not reaching hind margin; 

 only marginal bristles, none on second segment. Legs not long and 

 not strongly bristled ; claws and pulvilli small. Wings with first 

 posterior cell narrowly open, ending at apex of wing; discai angle 

 more or less obtuse ; only one bristle at base of cubital vein ; no distinct 

 costal spine. 



Nothing seems known about the biology of the genus, but my 

 species has been bred from a fungus with Tineid larvæ. 



Of the genus five or six European species are known, only one is 

 hitherto found in Denmark. 



1. G. zonella Zett. 



1844. Zett. Dipt. Scand. III, 1068, 63 et 1849. VIII, 3235, 63 {TacUna). 

 — 1907. Kat. palæarkt. Dipt. III, 392 [Actia). — 1924. Stein, Arch. f. Natur- 

 gesch. 90, 6, 140, 3. 



Male. Frons broader than the eye, with parallel margins. Orbits, 

 cheeks and jowls grey; frontal stripe black or brownish, narrower 

 than orbits. Frontal bristles not or scarcely reaching the end of 

 second antennal joint. Vibrissæ quite slightly ascending. Orbits with 

 a few black hairs; jowls black-haired. Occiput grey, with black hairs. 

 Antennæ black, third joint very broad, more than twice as long as 

 second, reaching end of epistoma; arista short, thickened in more 

 than basal half. Palpi small, yellowish. Thorax grey, with mdication 

 of two narrow darker stripes in front, black-haired; the præscutellar 

 acrostichals large. Of the four sternopleural bristles the lower and the 

 middle upper small, besides generally some smaller hairs. Abdomen 

 black, shining, the three last segments with a narrow, silvery pruinose 

 front band, interrupted in the middle; abdomen is black-haired, 

 with marginal bristles, none on second, a pair on third and a row on 

 fourth segment. Hypopygium not large. Legs black, not much bristled. 

 Wings hyaline or a little yellowish; veins brown to black; apical 

 cross-vein concave; medial cross- vein about at middle of discai 

 cell or slightly behind; last part of postical vein at most one and a 

 half time as long as postical cross-vein. Squamulæ dirty yellowish. 

 Halteres yellow. 



Female. Similar; frons slightly broader; antennæ smaller as third 

 joint is less broad; palpi much larger, club-shaped and darker to black. 



