HYGROCELEUTHUS. IT 



Gen. I. HYGROCELEIJTHUS. 



The genera Hygroceleuthus and Dolichopus are the only ones 

 which have spine-like bristles on the first joint of the hind tarsi, 

 and this character helps to distinguish them most easily from all 

 other Dolichopodidae. They have also the following characters in 

 common : first antennal joint beset with hairs above ; third joint 

 not prolonged ; arista dorsal ; hypopygium entirely disengaged ; 

 its outer appendages proportionally large or moderately large, 

 lamelliform. The difference between the two genera is to be 

 found in the length of the face, which, in Hygroceleuthus, reaches 

 down to the inferior corner of the eye, and which is shorter in 

 Dolichopus. In the typical species of Hygroceleuthus the first, 

 and. sometimes also the second joints of the antenna? are consider- 

 ably longer than in Dolichopus. As on one side the European 

 Hygroc. Diadema Hal. approaches Dolichopus by the structure 

 of its antennae, so, on the other side, some species of Dolichopus, 

 for instance, D. plumipes Scop., a species common to Europe and 

 North America, are related to Hygroceleuthus by the somewhat 

 greater length of their face. 



1 know as yet only four species of Hygroceleuthus ; of the three 

 typical species, one inhabits northern and middle Europe; the 

 second Siberia; the third North America. The fourth species of 

 the genus is spread over all Europe. 



The name Hygroceleuthus (vyeox£tev$o$, living in the wet) has 

 been given to the genus on account of the species being found in 



moisl localities. 



1. H. latipes Loew. % and 9- — Aeneo-viridis, antennis runs, ciliis 

 oculorum inferioribus pallidis, tegularum ciliis nigris, tarsis interrnediis 

 maris compressis. 



Brassy green ; antenna; red ; cilia of the inferior orbit pale; cilia of th* 

 tegulae black ; middle tarsi of the male compressed. Long. corp. 0.26. 

 Long. al. 0.23. 



Sth. Hygrocdeuthut latipes Loew, Neue Beitr. VIII, 5. 

 2 



