Paraspiniphora. 113 



above the middle, middle tibiæ with a pair near the upper fourth 

 and an anterior at about the lower third, hind tibiæ with four bristles, 

 a dorsal near the middle, two more anterior, one at the upper third 

 and one near apex, and fmally one anterodorsal bristle at the middle. 

 Wings yellowish; veins brown; costa reaching beyond the middle, 

 1 at most double 2; costal cilia rather short; fourth vein somewhat 

 strongly curved at base. Halteres yellow. 



Female. Similar; the antennæ smaller with arista much more 

 distinctly pubescent, and palpi with ordinary bristles; further the 

 tarsi show a peculiar sexual difference; on the anterior tarsi the last 



Fig. 44. Wing of P. Bergenstammi $. 



joint is relatively a little larger than in the male and more hairy, 

 the claws are long and broad, the empodium long, curved upwards 

 and hairy below the apical part, the hair above, between the claws 

 is long, curved downwards, flattened and band-shaped; also the 

 pulvilli are larger; the same features are present on the hind tarsi, 

 but to a smaller degree. The seventh abdominal segment is deeply 

 excised above and often reddish. 



Length. The species may vary very considerably in size, the 

 length from 1,5 to 3,5 mm, the female is generally the larger. 



Both Mik and Becker describe the thorax in the female as often 

 brown, in my material it is black in both sexes. 



P. Bergenstammi is not rare in Denmark, Ermelund, Holte, 

 Hillerød, Suserup Skov at Sorø (Th. Mortensen), Bogø south of Sea- 

 land (the author), at Strandby on Lolland (L.Jørgensen); the dates 

 of capture are in July; it was for the first time taken in 1917. I have 

 bred it in some numbers from shells of H. hortensis^ nemoralis and 

 lapicida taken by Mr. Jørgensen at Strandby in the first months of 

 the year, the imagines developed in April, but the development was 

 probably accelerated; I have further bred it from H. pomatia., taken 

 by Mr. Kryger in Ermelund in the winter, the imagines came in May, 



