Diptera danica : genera and species of flies hitherto found in Denmark . l.) he has further Bibio annnlata, also a new two common species were thus originally founded on Danishspecimens. Zetterstedt in 1842 (Dipt. Scand. I) records one species,nobilitata, from Denmark and no more in the following Loew in 1847 (Dipt. Beitr. II) records bipunctata from Den-mark. Thus in all three species were known. In the present work10 species are enumerated. Only one genus, Thereva, occurs in Denmark. 1. Thereva of medium size, more or less hairy, generally the males
Diptera danica : genera and species of flies hitherto found in Denmark . l.) he has further Bibio annnlata, also a new two common species were thus originally founded on Danishspecimens. Zetterstedt in 1842 (Dipt. Scand. I) records one species,nobilitata, from Denmark and no more in the following Loew in 1847 (Dipt. Beitr. II) records bipunctata from Den-mark. Thus in all three species were known. In the present work10 species are enumerated. Only one genus, Thereva, occurs in Denmark. 1. Thereva of medium size, more or less hairy, generally the malessomewhat long haired, the females shorter and more sparingly colours greyish or yellowish to blackish, sometimes as broad as thorax, broader than high; it is somewhat archedin front, but the face which looks forwards and downwards is some-what flattened; the head is slightly arched behind; the frons is some-times more or less protruding. Eyes in the male somewhat reniform,touching, in the female well separated, the vertex being more or less. Fig. 45. Antenna of T. nobilitata. X ; in the female the frons very often has a black, shining callus,sometimes divided into two. The eye-facets are in the male largerin the upper part than below. The colour of the eyes is more orless dark greenish, slightly metallic, in some species as anilis andannulata bright green; along the posterior eye-margin there is a rowof weaker or stronger occipito-orbital bristles, they are generallystronger in the females than in the males; also farther down on theocciput there are some bristles. Antennae inserted near to each other,in or a little below the middle. Jowls small, slightly descending belowthe eyes. Antennae consisting of five joints, the first somewhat long, Therevidae. 135 the second short, globular, the third generally the longest, at theapex with a small, two-jointed style the first joint of which is short,the second terminating in a bristly apex; sometimes
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