Dolichopodidae. 163 



This genus is, as mentioned, nearly related to Hercostomus, espe- 

 cially to the subgenus Hercostomus ^ it is mainly distinguislied by the 

 subplumose arista, and partly by the course of the wing-veins. 



As far as I am aware the developmental stages of the genus 

 are not known. 



The species o( Foecilobothnis are all somewhat large, very beauti- 

 ful flies ; they occur in low herbage on meadows, especially at horders 

 of water, and also in woods on humid piaces. 



Of the genus 9 species are known from the palæarctic region; 

 one is found in Denmark. 



1. P. nobilitatus L. 



1767. Linn. Sysl. Nat. Ed. XII, 2, 995, 98 {Musca). — 1805. 

 Fabr. Syst. Antl. 268, 6 (Dolichopus). — 1824. Meig Syst. Beschr. IV, 

 75, 1 {Dolichopus). — 1831. Stann. Isis 1831, 140, 34 (Dolichopus). — 

 1842. Stæg. Krøyer's Tidsskr. IV, 37, 30 (Dolichopus). — 1843. Zett. 

 Dipt. Scand. II, 565, 55, et 1849. VIII, 3085, 55 (Dolichopus). — 1862. 

 Schin. F. A. I, 206 (Gymnopternus). — 1903. Kat. palåarkt. Dipt. II, 308. — 

 Dolichopus plumicornis Meig. 1824. Syst. Beschr. IV, 83, 15. 



Male. Vertex and frons green. Epistoma greyish white, slightly 

 yellowish upwards. Palpi dark. Occiput green; postocular bristles 

 yellowish below, black above. Antennæ short, black, third joint short 

 triangular. Thorax bright green, sometimes æneous or bluish, with 

 indications of stripes in the middle, only slightly shining ; on the fore- 

 most part it is greyish or brownish pruinose ; at the upper part of the 

 præsutural depressions there is a velvet black, somewhat purplish spot; 

 scutellum often bluish in the middle, short and sparingly pubescent at the 

 margin and with a few hairs above. Pleura greenish or æneous, grey 

 pruinose ; propleura with pale hairs and a black prothoracic bristle. Ab- 

 domen green or more or less golden or coppery, slightly greyish pruinose 

 downwards; it is clothed with short, black hairs, and has hindmargi- 

 nal bristles, longest on the first segment. Venter green or bluish, 

 greyish pruinose, with distinct, pale hairs, which are long at the base. 

 Hypopygium somewhat short, blackish green or æneous, more or less 

 grey pruinose; the eighth segment has black hairs, and is a little 

 reddish in the middle at the upper margin ; on the ventral side there 

 are broad lobes in the middle, which are projecting downwards, tri- 

 angular, and with some hairs; at the end of the hypopygium there 

 are two pairs of inner lamellæ, the lateral are directed straight 

 backwards, they are elongated triangular, attenuated to a thin point 

 and with a hair at the upper margin; the median inner lamellæ are 

 curved strongly downwards and somewhat hammer-like dilated at the 



11* 



