. Fig. 95. Antenna of S. leucxirus 9- X 85. From a dried object. Female. Epistoma broad, coloured as in the male, and bluish and shining below. Antennæ shorter than in the male, the third joint pointed oval, arista a little longer than the antennæ. Length 2,5 to about 3 mm. S. leiicurus is rare in Denmark, we have only three specimens, two males and a female, which I bred from a hollow beech at Ørholm. In the beech were larvæ of Xylomyia maculata and on the Vt 1908 I took home a portion of tlie quite loamy decaying wood; in the fol- lowing week came the Si/stenus, but I did not detect the pupæ
. Fig. 95. Antenna of S. leucxirus 9- X 85. From a dried object. Female. Epistoma broad, coloured as in the male, and bluish and shining below. Antennæ shorter than in the male, the third joint pointed oval, arista a little longer than the antennæ. Length 2,5 to about 3 mm. S. leiicurus is rare in Denmark, we have only three specimens, two males and a female, which I bred from a hollow beech at Ørholm. In the beech were larvæ of Xylomyia maculata and on the Vt 1908 I took home a portion of tlie quite loamy decaying wood; in the fol- lowing week came the Si/stenus, but I did not detect the pupæ. Geographical distribution:— Northern and middle Europa down into Germany; it occurs in England, but is not known north of Den- mark. The species is only known from bred specimens. IV. Hydrophorinae. 19. Acltalciis Loew. Species of very sniall size and of not or only slightly melallic, blackish, greyish or yellowish colour. Head about as broad as or a little broader than thorax, somewhat semiglobular. There are ocellar, outer vertical and postvertical bristles, and a pair of small bristles on the posterior side of the ocellar tubercle. The eyes are slightly and short-hairy, almost microscopically; they are separated in both sexes; the epistoma is narrow in both sexes, and only slightly broader in the female than in the male. The postocular bristles form a single row. The antennæ placed near to each other, somewhat above the middle; they are not long, a little longer in the male than in the female; the first joint short, the second small and simple, the third somewhat pointed oval, a little longer in the male than in the female, and in this latter sex less pointed; it has a characteristic shape as the upper margin is convex, the lower straight or nearly so.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishercopenhagengecgad
