ADAMS : NORTH AMERICAN DIPTERA. 453 



posterior cell, and nearly above the hind cross-vein, is a rather 



large hyaline spot. Length, male, 3.5 mm., and female, 4 mm. 



Six specimens ; Palo Alto, Cal., and Lance creek, Wyoming. 



Blachiptera bilineata, n. sp. 



Female : Head yellow ; frontal triangle, occiput, except on 

 the lower part, tip of third antennal joint, and arista black ; 

 pile yellow. Thorax shining black, pile yellow ; mesonotum 

 sparsely punctured, two subdorsal rows of grayish yellow, mi- 

 croscopic hairs, the rows widen caudad and almost meet in 

 front of the scutellum ; scutellum black, coarsely punctured, 

 apical tubercles small ; halteres light yellow. Abdomen shining 

 black, pile yellow. Coxae and legs yellow, anterior tibiae and 

 all tarsi brownish. Wings hyaline, veins at base of wing yel- 

 lowish, on remaining part brownish, third and fourth veins be- 

 yond discal cell parallel, hind cross- vein more than its length 

 from the small cross-vein. Length, 2.7 mm. 



One specimen ; Oak Creek canyon, Arizona. Collected by 

 Dr. F. H. Snow. 



Hippelates splendens, n. sp. 



Female : Head black ; narrow anterior border of front, face, 

 antennjie except apex, and palpi yellow ; frontal triangle shining. 

 Thorax shining black ; mesonotum and scutellum sparsely punc- 

 tured, each puncture bearing a short whitish hair, scutellum 

 also with an apical pair of bristles ; halteres yellow. Abdomen 

 black; venter yellowish basally, pile yellowish. Coxae black, 

 femora except apex, concolorous, tibiae and tarsi yellow. Wings 

 hyaline, veins yellowish brown. Length, 2.2 mm. 



One specimen; Lusk, Wyo. Collected by Hugo Kahl. 



