246 DIPTERA OF NORTH AMERICA. [PART II. 



II. Tegulse witli pale cilia. 



A. Antennae entirely black. 



15. scintillans Lw. 



B. The two first joints of the antenna? pale. 



A. Fore femora in both sexes, or at least in the % , without yellow 

 thorn-like bristles upon the under side. 



1. Abdomen at the basis not yellow. 

 1G. pallens Wied. 



2. Abdomen at the basis yellow, not metallic. 



a. Tarsi for the most part black. 



17. variegatus Lw. 



b. Tarsi towards the end but little infuscated. 



a. All the coxae entirely yellow. 



18. bicolor Lw. 



&. Middle coxa gray with yellow tip. 



19. psittacinus Lw. 



b. Fore femora in both sexes with yellow thorn-like bristles upon 

 the under side. 



1. All the coxa? entirely yellow. 



20. tener Lw. 



2. Middle and hind coxa? blackish. 



21. filipes Lw. 



Description of the Species. 

 I. TeGULjE CILIATED WITH BLACK. 



A. Wings with a black picture. 



a. Wings black, only the tip and the hind margin hyaline. 



1. P. dimidiatlis Loew. %. — Nitidissimus, capite thoraceque vio- 

 laceis, abdomine viridi ; pedes simplices, graciles, femoribus nigris, tibiis 

 flavis, tarsis fuscis ; alae ex fusco nigrae, triente apicali et margine pos- 

 tico hyalinis. 



Very shining ; head and thorax purplish-blue, abdomen green ; feet plain 

 and slender with black femora, yellow tibia? and brown tarsi ; wings 

 brownish-black, the last third and the hind margin hyaline. Long, 

 corp. 0.17. Long. al. 0.19. 



Syn. Psilopus dimidiatus Loew, Berl. Ent. Zeitschr. VI, 216, 70. 



