66 CYRTIDAE OF NORTH AMERICA 



as long as in some species, with rather long thick brown pile. Humeral 

 and prealar calli black. White color which is around base of wings extends 

 some distance on the post-alar callosities. Squamae grayish with black 

 margins, the black color spreading some distance into the membrane; sur- 

 face of squamae with short white pile. Alar squamae pure white. Thoracic 

 spiracle white and with a narrow white line separating pleura from mes- 

 thoracic dorsum. Pleura and coxae brownish-black. 



Abdomen shining brownish-black with sparse white pile; the posterior mar- 

 gins of all abdominal segments but first, narrowly white. Femora darkened, 

 knees, tibiae and tarsi whitish; the claws black. First and second segments of 

 venter and median spot on third blackish-brown, the rest sordid whitish. Wing 

 veins pale brown but quite strong; the upper branch of the fifth longitudinal 

 fork and the anal vein much clearer than usual (see fig. 41). 



Hahitat.—Stockton, Utah, July 11, 1916, (T. Spaulding). 



Type. — A female in Museum of Comparative Zoology at 

 Cambridge. 



Ogcodes dispar (PI. XIV, fig. 39.) 

 Oncodes dispar Macquart, Dipt. Exot., Suppl., v, p. 67, pi. 11, f. 12, (1855). 



cf . Body bright yellow. Head and antennae blackish. Thorax with a 

 brown tinge in some specimens. Scutellum brownish-yellow. Thorax and 

 scutellum with short yellow pile which does not conceal the ground color. 

 Pleura yellowish. Squamae yellow hyahne with a yellow margin. 



Abdomen usually a little paler than thorax. Incisures whitish and raised 

 slightly. Sides of abdomen with very conspicuous blackish spots around the 

 spiracles. Venter yellow with broad whitish posterior margins to segments and 

 round brown spots at sides of second, third and fourth. Stem of halteres 

 yellow, the knob brown. Genitalia brown. 



Legs yellow with short yellowish pile. Hind tibia darkened in middle and 

 above in some specimens. Tarsi brownish, the last joint darkest. Claws 

 black. Wings hyaline with a shght brownish tinge. Costal cells pale brown. 

 Veins of wing brown. Length, 5.5 mm. ; wing, 5 mm. 



9 . Body a sepia brown, often with yellowish or whitish mottlings. Head 

 noticeably smaller and wings larger than in the male. Squamae pale brown. 

 Abdomen dark brown with narrow white incisures. Venter blackish brown 

 with paler posterior margins. Legs darker than in male and wings more in- 

 fuscated. Length, 5.5 mm.; wing, 6 mm. 



Habitat. — Macquart described the species from Baltimore, 

 Maryland (coll. M. Bigot). I have seen specimens from Mary- 

 land; Arizona; Montreal, Quebec, and Pennsylvania. 



Macquart noted the difference in color of two specimens on the 

 same pin. He could not distinguish the sexes but considered 

 them one species. There are a number of specimens in the Na- 

 tional Museum from Plummer's Island, Maryland, taken in May, 



