256 NORTH AMERICAN TRYPETINA. 



IX, f. 2. Meigen's figure (Syst. Beschr. V, Tab. XL VIII, f. 3) 



likewise represents the latter variety. It is probable that it will 

 also be found in America. 



Observation 2. — The present species, as well as the preceding, 

 belongs to the genus Trypeta in the narrower sense. 



20. T. polita Loew. 9. (Tab. X, f. 12.)— Atra, nitida, scutello 

 tumido concolore, capite prater faciern exalbidam pedibusque lutescen- 

 tibus, alse albido-hyalinae, macula basali atra, fasciisque tribus latis- 

 siinis fusco-nigris, venis trausversis valde approximates. 



Deep black, shining; the tumid scutellum is concolorous ; the head, with 

 the exception of the whitish face, and the feet clay-yellowish ; the 

 whitish-hyaline wings have a deep black spot upon the basis and three 

 very broad deep black crossbands ; the crossveins are very much 

 approximated. Long. corp. J 0.17 — 0.18, cum terebra 0.22; long. al. 

 0.17—0.18. 



Syn. Trypeta polita Loew, Monogr. "Vol. I, p. 77. Tab. II, f. 12. 



Hab. Mississippi (Schaum); Washington, D. C. ; Xew York; 

 Connecticut (O. S.). 1 



Observation. — I have nothing to add to the above-quoted 

 description. The systematic position of this species will be dis- 

 cussed in the second remark to the following species. 



21. T. atra Lw. % 9 . (Tab. XI, f. 17.)— Atra, nitida, scutello tumido, 

 concolore, capite prater faciem albidam, femorum apice, tibiis tarsisque 

 luteis ; alse albido-hyalinse, macula basali atra, fasciisque tribus latis 

 fusco-atris, venis transversis valde approximatis. 



Deep black, shining; the tumid scutellum concolorous; the head, with 

 the exception of the whitish face, the tip of the femora, the tibiae, and 

 the tarsi clay-yellow ; the whitish-hyaline wings have a deep black spot 

 upon the basis and three broad, deep brownish-black crossbands ; cross- 

 veins very approximate. Long. corp. £ 0.12 — 0.13, J 0.13 — 0.14, cum 

 terebra 0.17—0.18; long. al. 0.13—0.15. 



Syn. Trypeta atra Loew, Berl. Entom. Zeitschr. VI, p. 219. 

 Trypeta atra Loew, Dipt. Anier. Sept. Cent. II, No. 89. 



Deep black, shining. Front rather broad, of a vivid reddish- 

 yellow ; the ocellar triangle, as well as the little stripes descend- 

 ing from the vertex and bearing the uppermost bristles of the 

 vertex, black, with a whitish-gray pollen ; anteriorly, on the lateral 



1 This species produces the galls on Solidago, described by me in the 

 Trans. Amer. Entomol. Soc Vol. II, p. 301. O. S. 



