190 DIPTEROUS GENUS DIAPHORUS 



very short, those on the fore femora longest ; tibiae and tarsi 

 yellow, in one specimen the tarsi are scarcely darker towards their 

 tips, in the other the distal third of hind tibiae and their tarsi are 

 brownish ; the bristle on the front side of the middle tibiae near 

 the base is rather large ; bristles of the hind tibiae small ; pulvilli 

 of the fore tarsi a little enlarged. Tegulae, their cilia and the 

 halters yellow. Wings hyaline ; the first vein does not reach quite 

 half the distance to the tip of the second vein. 



Two females that appear to belong here have the palpi 

 normal but still rather large, yellowish with thinner white pollen ; 

 the face is black when viewed from in front and has a transvers 

 suture below the middle ; third antennal joint small ; front and 

 thorax more coppery than in the male ; wings with the first vein 

 shorter than in the male (this is often the case in this genus). 



Described from two males and two females from Lewiston, 

 Idaho. Type in the collection of Prof. J. M. Aldrich. 



34 Diaphorus amoenus Aid. 



Diaphorus amoenus Aldrich, Kans. Univ. Sci. Bull., vol. i, 

 p. 86. 



Male : Length 2.5 mm. Eyes widely separated by the front ; 

 pollen of the face yellowish ; antennae black, third joint pointed ; 

 arista apical ; palpi yellowish white, very large, about a third as 

 long as the height of the head and two-thirds as wide as long. 

 Thorax and abdomen bright green, somewhat golden, the former 

 a little dusted ; bristles at the tip of the abdomen distinct. Halters 

 and cilia of the tegulae yellowish. Fore coxae, femora and tibiae 

 yellow; middle and hind coxae brown; pulvilli of fore tarsi 

 elongated. Wings tinged with gray. 



Grenada, W. I. 



35 Diaphorus parvulus Aid. 



Diaphorus parvulus Aldrich, Trans. Ent. Soc. of Ludon, pt. 

 iii, p. 321. 



Male : Eyes widely separated by the front ; antennae black, 

 third joint rather large; arista subapical. Thorax shining green. 

 Abdomen bronze green, venter yellowish, without stout bristles at 

 tip. Fore coxae, apical part of middle coxae, femora, tibiae and 



