All of our species have four postsutnral and four sternopleural macro- 

 clueta^, and at most with only two marginal macrocha'ta' on the lirst 

 segment of the abdomen; hind tibia^ outwardly ciliate, two pairs of 

 orbital bristles in both sexes: 



1. Third joint of antennjie, except sometimes the base, black 2. 



Third joint of aDtennse deep yellow; otherwise as in ccipitata; length, 



11 to 13 mm. Maryland; St. Louis, Mo., and Georgia. (Cana- 

 dian Entomologist, Vol. XIX, p. 10; January, 1887. Gonia 

 sagax Towusend, Canadian Entomologist, Vol. XXIV, p. 65; 

 March, 1892.) nenilis Will. 



2. Viewed from the side, the head projects in front of the eye only 



slightly more than the horizontal diameter of the eye, and is 

 sparsely covered with bristly hairs ; sides of front, when viewed 

 from behind, shining, destitute of pollen except next the eyes; 

 abdomen black, the sides sometimes jDartly or wholly reddish or 

 yellow, bases of last three segments gray pollinose; length, 9 to 

 14 mm. Toronto, Canada; Beverly, Mass.; Oswego, X. Y. ; 

 District of Columbia; Xorth Carolina; Georgia; Detroit, Mich.; 

 Illinois; Ames, Iowa; Missouri: Sunnyside, Ark.; Kansas; 

 Texas; Colorado; California; Pullman, Wash., and Austria. 

 A male specimen from Austria received from Brauer and Ber- 

 genstamm and by them labeled Gonia capitata DeGeer.' (Me- 

 moires servir I'Histoire Insectes, Vol. VI, p. 12; 1770: Mmca, 

 Gonia fronfofia Say, Journal Acad. Xat. Sci. Phila., Vol. VI, 

 p. 175; 1829. Gonia -phila del phi ca Macquart, Dipteres Exo- 

 tiques. Vol. II, I»art III, p. 208 [51]; 1842. Gonia albifrons 

 Walker, List of Dipterous Insects, Part IV, p. 798; 1849. 

 Gonia exul Williston, Can. Entomologist, Vol. XIX, p. 11; Jan., 

 1887. Gonia seqnax Williston, loc. cit., p. VI.). capitata DeGeer. 

 Viewed from the side, the head projects in front of the eye almost 

 twice the horizontal diameter of the eye and is densely covered 

 with bristly hairs; sides of front when viewed from behind 

 wholly covered with white pollen; black, the front, including 

 the vitta, the face, cheeks, pal])i. humeri, hind end of thorax, 

 scutellum, and sides of the first three segments of the abdomen 

 except the hind margin of the third, yellow; front in profile 

 only slightly convex, almost at right angles to the occiput, in 

 the male two and one-half times as wide as either eye, frontal 

 bristles descending to base of second antennal joint, two or 



' The synonymy of this species in Europe is very uncertain and unsatisfactory. It 

 will doTibtless be found that ornata Meigen aihV fasciata Meigen are but colorational 

 inrnis of capitata DeGeer. Our specimens of the latter from this country show every 

 possible gradation from those with the abdomen wholly black to those that have it 

 yellow and marked with a narrow black dorsal vitta. A female having the abdomen 

 wholly black except a small yellowish spot on each side of the second segment was 

 taken united in coition to a male in which the sides of tlie lirst three segments were 

 almost wholly yellowish. 



