DIPTERA. 34' 



5. Diaphorus 



Hab. Mexico, Teapa and Medellin (H. H. Smith). 



A single pair. Allied to D. satrapa, Wheeler, in having the base of the abdomen 

 yellow. I refrain from describing the species, as I am not certain that it differs from 

 the following. 



6. Diaphorus ? 



Hab. Mexico, Teapa (H. H. Smith). 



One pair, both specimens badly broken. The wing of the male has the third vein 

 peculiarly sinuate, a character upon which the genus Lyroneurus, Loew, is based. See 

 my remarks under B. simplex, antea, p. 345. 



CHRYSOTUS. 



Chrysotus, Meigen, Syst. Beschr. iv. p. 40 (1824). 



1. Chrysotus teapanus, sp. n. 



A small, dark species, resembling C. niger, Aldrich, but with paler legs and more metallic dorsum. 



S . Eyes contiguous for half the length of the face ; palpi blackish ; antennae black, small, the third joint in 

 some specimens slightly prolonged, but usually short, the arista pubescent ; front dark green, but little 

 metallic ; cilia of inferior orbil; apparently black, except perhaps one or two near the mouth (I have not 

 been able to see them well, on account of the head in nearly all the specimens being a little flattened back 

 against the thorax). Dorsum of the thorax bright green, pleura) greenish-black ; halteres yellow ; tegulae 

 brownish, the cilia varying from brown to yellow, according to the light. Abdomen somewhat more 

 golden green than the thorax, blackish beneath, the dorsum with rather numerous black hairs. Coxa? 

 and femora brownish-black, the tibiae and tarsi yellow (apparently rather variable in colour). Wings 

 greyish ; venation not presenting any marked peculiarities. 

 $ . Face of uniform width, whitish- dusted ; legs a little paler than in the male. 



Length 1*4 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 

 Seven males and three females. 



2. Chrysotus discolor. 



Chrysotus discolor, Loew, Neue Beitr. viii. p. 65 l ; Mori. N. A. Dipt. ii. p. 182 2 . 



Hab. Noeth America, Middle States 1 2 .— Mexico, Chilpancingo and Omilteme 

 in Guerrero, Teapa in Tabasco (H H. Smith). 



Seven specimens, including both sexes, agreeing perfectly with the description. It 

 ought to be mentioned, in addition, that the bristles of the body are pale, varying from 

 whitish to brownish. The violet abdomen of the male is the most striking character, 

 and seems perfectly constant. 



2y2 



