176 UIPTEROUS GENUS DIAPHORUS 



This is one of the species that are difficult to place, but 

 the bristles at the tip of the abdomen although they are small 

 and the enlargment of the pulvilli seem to place it in this genus. 



The form of the antennae and general color would place it 

 near D. leucostoma Loew but it differs from that species, in hav- 

 ing a central vitta on the thorax. 



15 Diaphorus simplex Aid. 



Lyroneurus simplex Aldrich, Trans. Ent. Soc. of London, 

 189G, pt. iii, p. 333. 



Male : Length 3.5-5.5 mm. Eyes widely separated by the 

 front; antennae small, black, third joint crescent-shaped with 

 long, slender, subapical arista. Thorax and abdomen green with 

 considerable brown dust ; acrostichal bristles in a single row ; 

 bristles at the tip of the abdomen rather long. Tegulae, their 

 cilia, and the halters yellow. Fore coxae green at base becoming 

 yellow at tip ; all femora dark green ; trochanters, tips of femora, 

 tibiae and base of front and middle tarsi yellow ; pulvilli of fore 

 tarsi a little enlarged. Wings yellow at apex in front of the third 

 vein. 



W. I., Mex. 



16 Diaphorus alienus n. sp. 



Male: Length 1.7 mm. Face broad with silvery pollen, but 

 appearing black in certain lights ; palpi yellowish, of moderate 

 size ; front broad with whitish pollen, which almost conceals the 

 green ground color; antennae black, third joint rather large, 

 somewhat subquadrate, nearly as long as wide ; arista inserted 

 just above the upper corner (Fig. 8). Thorax bright green; 

 pleurae more blackish with white pollen. Abdomen green with 

 coppery reflections and without bristles at tip ; hypopygium large, 

 partly disengaged, with a curved central Aliment, black and 

 somewhat shining. Coxae black, the fore pair with yellow tips 

 and with white hairs on the front surface ; trochanters yellowish ; 

 femora greenish black ; tips of femora and tibiae yellow ; tips 

 of hind tibiae and the tarsi brownish ; pulvilli of front tarsi 

 but slightly enlarged. Tegulae, their cilia and the halters pale 

 yellow. Wings hyaline ; first vein reaching a little more than 

 one-third of the distance to the tip of the second vein. 



