. 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 Mi
. 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, Hillerod, Suserup Skov at Sore (Th. Mortensen), Bog0 south of Sea- land (the author), at Strandby on Lolland (L. Jorgensen); 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. Jorgensen 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, 8
Size: 3344px × 1495px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
