124 



ME LANDER AND BRUES. 



[Vol. 1. 



middle legs similarly ornamented if we except pluvtipes. For 

 this reason and because it shows a tendency toward the length- 

 ened face of Hygroceleuthus, we have included pliimipes in the 

 present paper. But as this species shows strong Dolichopns 

 characters in the short, stout antennae and slight costal thick- 

 ening, it cannot be placed satisfactorily in either genus as they 



have been defined. On 

 the other hand, the 

 European Hygroccleu- 

 this diadema merges 

 with Dolichopns on ac- 

 count of its shortened 

 antennae. 



The original defini- 

 tion of HygroceleiitJius 

 included a deep incision 

 in the hind margin of 

 the wing and broadened 

 wings. From these 

 characters Aldrichiidind 

 Wheelerii deviate very 

 decidedly. 



Latipes, the only 

 North American Hy- 

 groceleutJms which Loew saw, possessed no characters at vari- 

 ance with the typical species. It was because of limited material 

 that Loew felt justified in constructing this genus. Like other 

 genera founded on secondary sexual characters alone, such as 

 ^Rhagotieura and Spathochira of this same group, Hygroceleuthus 

 has been found invalid as the number of species increased. 



From the foregoing it seems advisable that Hygroceleuthus 

 be no longer retained with generic value, but may be kept as 

 an expression for a group of the genus Dolichopns. 



Of the previously described species of Hygroceleuthus, one 

 has failed to be recognized, lamellicornis Thom., if indeed 

 this be a species of Hygroceleuthus. The type was a female 

 from California, but the description omitted the important 

 points. 



Fic. I. — Showing length of face: i, Dolichopus comatus, 

 male; 2, Hygroceleuthus plumipes, male; 3, Hygroce- 

 leuthus Wheelerii, male; 4, Hygroceleuthus amnicola, 

 female ; 5, Hygroceleuthus afflictjis, male ; 6, Hygroce- 

 leuthus latipes, male. 



