22 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



leaves very numerous, nearly contiguous circular black spots, more 

 abundant on the thorax ; on the dorsum of thorax and abdomen the 

 ground color of the moderately shining punctulate black surface may 

 be in large part denuded. In the middle of the thoracic dorsum is a 

 pair of indistinct, less pollinose stripes. Antennae wholly yellowish 

 red ; the cheeks and the lower part of the face obscurely yellowish, in 

 the middle of the face below the antennai there is an oval space which 

 is evenly pollinose, free from the black dots. Wings hyaline, with two 

 conspicuous blackish spots ; the larger one beginning in the subcostal 

 cell at tip of auxiliary vein, thence more broadly along the marginal 

 cell, the base of the submarginal cell for a third of its length, and less 

 distinctly opposite this on the cross-vein and base of first posterior cell ; 

 the fsmaller spot reaching from the tip of the first longitudinal vein 

 nearly to the third ; veins black, brown toward the base. Legs yellow- 

 ish red; the front femora on basal half, and the other femora, except 

 the tips, black ; the front and hind tarsi brown. 



S . Five male specimens have the dorsal stripes more apparent, there 

 being three with two others between them less apparent ; the legs are 

 darker, the tarsi blackish ; the wings are hyaline, except a small black- 

 ish spot on the stigma reaching across to the third vein. 



One female. New Mexico (Morrison), and five males, California (Co- 

 quillett). 



Since writing the above I have received a number of specimens, both 

 male and female, from Mr. Coquillett, of California, and I find them all 

 agreeing with the males above described. They are all smaller than 

 the type specimen, and differ in the wings having only the one spot, 

 instead of two, as in the original female. A male specimen in the Na- 

 tional ]\[useum, from the Isthmus of Tehuan tepee, has the abdomen nar- 

 rower, with coppery reflections where denuded. Both the legs and the 

 spots on the wings are darker than in the type, and the latter are con- 

 nected through nearly the whole length of the submarginal cell. 



PIPIZA. 



Pipiza Falleu, Dipt. Suec. Syrpli., 58, 1816. 

 Heringia Roudaui, Dipt. Ital. Frodr., i, 53, 1856. 

 Pipizella Rondaui, Dipt. Ital. Prodr., ii, 185,1857. 

 Cntmodon Egger, Verli. Zool. Bot. ges., xv, ,573, 1865. 

 Pe«u(»i Phillipi, V«!rh. Zool. Bot. gcs., xv, 741, 1865. 



Dark metallic green, or black, small or moderate-sized species, thinly 

 pilose and finely punctulate, without yellow or light markings, except on 

 legs and sometimes a basal band on the abdomen. Head as broad or 

 somewhat broader than the thorax. Antenuie not longer than the head, 

 the third joint rounded, elliptical or a little elongate, the arista basal, 

 bare. Face flattened, receding, transversely arched, without tubercle, 

 not, or but slightly projecting below, rounded, clothed with pile, uni- 



