322 Professor Aldrich on the 



front shining green, broader than face ; antennae black, third joint 

 rather large, with subapical arista. Cilia of inferior orbit white. 

 Thorax shining green, a little dusted ; bristles black ; pleurae 

 black, with thin grey dust. Abdomen shining bronze-green, 

 venter yellowish ; the black bristles at apex not present ; hypopy- 

 gium concealed, the tips of two small, yellow appendages 

 visible ; hair of abdomen black, below somewhat reddish. Fore 

 coxae yellow, with yellow hairs ; middle coxae pale at tip, the basal 

 half or more blackish ; hind tibiae yellow with dark base. Femora, 

 tibiae and tarsi yellow, the last one or two joints of the tarsi 

 infuscated ; the femora sometimes have a brownish tinge. Fore 

 tarsi one and a-half times the length of the tibiae, with enlarged 

 pulvilli ; the other pulvilli of equal size scarcely enlarged. The 

 erect lateral bristle of the middle tibiae very large. Wings 

 yellowish, with yellow veins and the usual configuration. 



9 . Antennae, particularly the third joint, smaller. Pulvilli 

 plain ; otherwise as in the male. 



Length 1 -2 mm. ; of wing, the same. 



Three males^ three females, 1500-2000 feet. May, 

 July. 



4. Diaphorus dimidiatusj n. sp. 



Light green, whitish pruinose ; basal half of abdomen yellow. 



^ . Face and front concolorous, bluish-green with grey dust ; 

 lower part of the face rather narrow, palpi rather large, pale 

 yellow, with black hairs; antennae blackish, third joint very short, 

 with dorsal arista ; cilia of lateral and inferior orbit pale, the 

 lower ones long. Thorax light green, somewhat bluish, wholly 

 pruinose with white ; in the middle of the dorsum a little shining ; 

 pleurae concolorous with the dorsum, opaque ; halteres large, pale 

 yellow; tegulse pale yellow with black cilia. Second and third 

 segments of the abdomen light yellow, with black ihairs ; fourth 

 and fifth segments shining green, a little coppery ; the four apical 

 bristles large ; hypopygium concealed, with scarcely visible 

 appendages. Fore cox^ pale yellow, with long black bristles and 

 a few small black hairs on the front side ; middle coxae black with 

 yellow tip, with rather coarse black bristles on the front side ; 

 hind coxae brownish-yellow, more black at base, purer yellow at 

 tip, with a single lateral bristle. Femora, tibiae and tarsi yellow, 

 the last two or three joints of the tarsi infuscated ; the fore tarsi 

 are longer than the tibiae, with pulvilli as long as the third 

 joint ; middle tarsi proportionally a little shorter, their pulvilli 



