Dolichopodidae. 53 



far down, is scarcely valid, several species of Dolichopus coming near 

 in this respect. Melander and Brues (Biol. Bull. I, 1900, 123) have 

 also treated the genus as a subgenus only, and have among several 

 American species also referred D. plumipes to it, and Aldrich unites 

 it in the Gatal. of North Amer. Dipt. with Dolichopus. 



Of the genus 4 species are known from the palæarctic region; 

 two occur in Denmark. 



Table of Species. 



1 . Discai vein bent obtusely 1 . latipennis. 



— Discai vein bent rectangularly 2. diadema. 



1. H. latipennis Fall 



1823. Fall. Dipt. Suec. Dol. 8, 1 (Dolichopus). — 1824. Meig. Syst. 

 Beschr. IV, 83, 16 (Dolichopus). — 1831. Stann. Isis 1831, 45, 1 (Doli- 

 chopus). — 1842. Stæg. Krøyer's Tidsskr. IV, 13, 1 (Dolichopus). — 1843. 

 Zett. Dipt. Scand. II, 503,3 (Dolichopus). — 1862. Schin. F. A. I, 212. — 

 1903. Kat. palaarkt. Dipt. II, 294. 



Male. Frons and vertex bluish. Epistoma moderately broad, 

 stretching downwards just to the lower margin of the eyes; it is 

 light grey, brownish above. Palpi greyish yellov^. Occiput grey, 



Fig. 14. Antenna of H. latipennifi c?, from the inside. X oO. 



slightly greenish; postocular bristles black above, yellowish below, 

 Antennæ black, long, the two basal joints somewhat elongated, of 

 about equal length, the third shorter, pointed oval; the basal joint 

 with bristles above, the second with very small bristles at the apex, 

 it overlaps the third above on the outside, below on the inside; the 

 arisla somewhat short, distinctly hairy. Thorax bluish or greenish 

 black, at the sides more greenish, shining, very slightly brownish 

 pruinose, most distinctly anteriorly; sometimes it is more bronze- 

 coloured. There are two posthumeral, a præsutural and three supraalar 

 bristles; sometimes some of the hairs on the front part of the disc 

 may be strong, so as to imitate bristles. Scutellum with short, pale 

 hairs, especially distinct at the margin, and with two black bristles 



