Kansas University Quarterly. 



Vol. II. JULY, 1893. No. i. 



Revision of the Genera Dolichopus and 

 Hygrocelentlins. 



P.V J. M. ALDRICH. 



(With Plate I.) 



The two genera discussed in the present paper are readily separated 

 from all other North American Dolichopodidai by the presence of two 

 distinctive characters, — the hind metatarsus with one or more bristles 

 above, and the first antennal joint hairy above. In order to distin- 

 guish them from some related foreign genera, it is necessary to add 

 only one other peculiarity, — the antennal arista is always bare or 

 pubescent, never plumose. 



DOLICHOPUS Latrelle. 



Of the group so limited, nearly all the numerous species belong to 

 Dolichopus ; under the head of Hygroccleiithiis will be found a state- 

 ment of the characters belonging especially to the latter genus ; see 

 also Loew's Monograph. 



The following descriptions bring up the total number of North 

 American species of Dolichopus to eighty-one, of which only forty- 

 seven are found in Loew's Monograph. Of the remainder, five were 

 described later by Loew in his seventh Century ; Osten Sacken 

 described three in his Western Diptera and one {/uyosoia) in Biologia 

 Centrali-Americana, Dipteral, 213; Wheeler published four {incon- 

 gruus, flagellitcnois, hcnshatvi, gcrwauus) in Psyche, May, 1890, p. 

 337 ; and twenty-one are described in the following pages. The bib- 

 liographical references omitted here are found in Osten Sacken's 

 catalogue. 



The acquisition of such a large number of species since Loew's time 

 has only served to emphasize the correctness of his views on the 

 geographical distribution of the genus. It belongs distinctly to the 



(1) K.\fl. UNIV. QUAK. vol,. U, NO. 1, JULY, 1893, 



