EMPIS. 215 



1. Empis diaphorina, sp. n., $ . 



Metallic green ; antennae and coxa? black ; legs yellow, the hind pair with black fringes. 

 Length about 4 millim. 



Hah. Mexico, Ciudad in Durango 8100 feet (Forrer). 



Differs from E. dolichopodina, Schiner (Brazil), by its black antennae ; from E. cyanea, 

 Bell. (Mexico), by the front legs being altogether yellow and without fringes, and the 

 wings yellowish, and not hyaline ; and from E. suavis, Loew (Mexico), by the colour of 

 the legs and wings. 



Antennae black ; third joint elongate, about as long as the first two joints united, with 

 a short style. Occiput hoary, beset with black pile ; front metallic green. Thorax 

 metallic green, shining, with a vestige of three pollinose stripes on the dorsum, the 

 latter sparsely beset with long, erect, black pile ; meso- and sternopleura shining metallic 

 green ; pteropleura black, slightly hoary ; the fan-like row of bristles black ; halteres 

 black; metanotum slightly pulverulent. Abdomen metallic bluish, greenish at the 

 base. Legs brownish-yellow, the tips of the tarsi brown ; the front pair beset with 

 moderately long, delicate hairs, their first tarsal joint long, swollen ; on the middle 

 pair the hairs are stouter and more dense, fringe-like, especially on the underside of 

 the femora ; the hind tibiae are broad and flattened, and bear, on each side, a fringe of 

 long, stout, almost scale-like hairs ; similar fringes on the hind femora, but less con- 

 spicuous ; coxae black ; trochanters brown. Wings with a pale brownish-yellow tinge 

 towards the root and the anterior margin ; stigma hardly visible ; hind margin greyish ; 

 the branch of the third vein nearly perpendicular ; the first vein issuing from the discal 

 cell turning anteriorly before its end ; the first and second veins reach the margin, but 

 are" very thin and evanescent before it. Two females. 



2. Empis benigna, sp. n., <? $ . 



Metallic green, the antenna? and legs black, the knees yellowish ; wings subhyaline, yellowish at the base and 



anteriorly. 

 Length 4-5 millim. 



Hah. Mexico, Ciudad in Durango (Forrer). 



Differs from the description of E. cyanea, Bell., by its black legs, the knees only 

 being yellowish. Compared with E. diaphorina the antennae are shorter and have the 

 third joint more lanceolate and less elongated; and the metallic green thorax is 

 without any vestige of pollinose stripes. 



Antenna? black ; third joint a little shorter than the preceding two joints united, the 

 division, or suture, occupying about two-thirds of its length and very distinct, the style 

 short and stout. Face and front very dark metallic, shining, almost black. Thorax 

 metallic green, shining, beset with long, erect, black pile ; pleura metallic green, shining 

 anteriorly, black, slightly hoary posteriorly ; halteres and the fan-like bristles in front 

 of them black. Abdomen metallic green ( <y ), or metallic blue, green at the base ( $ ) ; 



