256 NORTH AMERICAN TRYPETINA. 



IX, f. 2. Meigen's figure (Syst. Beschr. Y, Tab. XLVIII, 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 praeter faciem exalbidam pedibusque lutescen- 

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

 simis fusco-nigris, venis transversis valde approximatis. 



Deep black, sliming; the tumid scutelhim is concolorons ; tbe 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. 9 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. 



Bab. Mississippi (Schaum) ; Washington, D. C. ; New 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 praeter faciem albidam, femorum apice, tibiis tarsisque 

 luteis ; alas albido-hyalinae, 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, 9 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. Amer. 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. 



