174 DIPTEROUS GENUS DIAPHORUS 



Specimens from St. Vincent sent me by Prof. J. M. Aldrich 

 seem to belong here, although the costa is not thickened and 

 they are somewhat smaller. 



11 Diaphorus nigrescens Aid. 



Diaphorus nigrescens Aldrich, Biologia Diptera, i, p. 346. 



Male : Length 3.1 mm. Eyes separated by the front but 

 not widely so ; antennae small, black ; arista apical ; thorax 

 opaque black, a little shining behind ; abdomen blackish-green, 

 shining, apical bristles distinct ; hypopygium large ; legs opaque 

 black, all the knees yellow ; pulvilli white, moderately enlarged. 

 Wings unif ormally inf uscated, not very dark. Halters yellow ; 

 cilia of the tegulae black, that of the inferior orbits yellowish. 



Mexico. 



12 Diaphorus spectabilis Loew. 



Diaphorus spectabilis Loew, Neue Beitr., viii, p. 57 ; Mon. 

 N. A. Diptera, ii, p. 162. 



D. approximatus Aldrich, Trans. Ent. Soc. of London, 1896, 

 pt. iii, p. 321. 



Male: Length 3.5-4.25 mm. Eyes contiguous; antennae 

 small, black ; arista almost apical ; thorax and abdomen bronze 

 green, the former with yellowish brown dust, but quite shining ;• 

 bristles at the tip of the abdomen rather striking. Coxae and 

 femora black ; tibiae brownish yellow ; fore pulvilli very much 

 enlarged. Halters yellow with the, tips of their knobs some- 

 times inf uscated ;' tegulae yellow with blackish cilia which has a 

 yellowish reflection in some lights. Wings tinged with gray. 



Prof : Aldrich states that the eyes are narrowly separated 

 in some specimens. He described this form under the name of 

 D. approximatus. I have not seen any, where the eyes did not 

 touch on the front. 



I have seen specimens from Mo., 111., Tenn., N. J., D. C, 

 Va., N. C, Ga., La. Prof. Aldrich reports it from W. I. and 

 Mex. 



