

Kansas Uiniversity Quarterly. 



^oL. II. * JULY, 1893. . No. 



Revision of the Genera Dolicliopns and 



HyoToeelenthus. 



BY J. M.'^ ALDRICH. 



(With Plate I.) 

 The two genera discussed in the present paper are readily separated 

 from all other North American Dolichopodidre 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 limitetl, near!}- all the numerous species belong to 

 Dolichopits ; under the head of Hygroceleutliiis will be found a state- 

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

 also Loew's Monograph. 



The following descriptions bring up tlie total number of North 

 American species of Dolichflpiis 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 {niyosoia) in Biologia 

 Centrali-Americana,- Diptera I, 213; Wheeler published four {inco7i- 

 gruus, flagellitcncns, henshatoi, gc}-iiiaiiiis) in Psyche, May, 1S90, 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 sj^ccics since Loew's time 

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

 geographical distribution of the genus. It belongs distinctlv to the 



(n IvAN. UNIV. QU•^K. VOL. II. NO. 1, .JULY, 1893, 



