ORTALID^I TRITOX A. 107 



very small -extent only, so that the crossband appears somewhat 

 abbreviated near the anterior margin of the wing ; the thmi _ 

 hyaline crossband, which is almost as oblique as the second, is 

 more curved upon its posterior than upon its anterior portion. 

 Hab. Illinois (Dr. Schimer). 1 



3. T. Cimeata n. sp. $ <?. (Tab. VIII, f. 11.) Rufo-badia, abdo- 

 mine nigro; alse fuscae, fasciarum hyalinarum secunda obliqua et levis- 

 sime arcuata, tertia subnormali et recta. 



Reddish chestnut-brown, with a black abdomen; wings brown, their 

 second hyaline crossband oblique and only gently curved ; the third 

 almost perpendicular and straight. Long. corp. 0.23 0.25 ; long. al. 

 0.210.22. 



Reddish chestnut-brown, with a black abdomen. Front 

 opaque, however, with the exception of the edge of the vertex and 

 of the two callosities, descending from it, and bearing the strong 

 frontal bristles, of a rather reddish coloring ; with a very narrow 

 border of white pollen near the orbit ; this border also extends 

 over the face, but is not very perceptible here. The remainder 

 of the face is covered with a very delicate whitish pollen, which 

 is more perceptible near the antenna? only. The third antennal 

 joint, with the exception of its basis, brown; arista with a very 

 short, yet distinctly perceptible, pubescence. Thoracic dorsuni 

 upon its sides with a broad shining border, otherwise opaque ; 

 the rather whitish pollen which covers it is very distinct in well- 

 preserved specimens, but even in such specimens it does not form 

 any distinct longitudinal stripes. Scutellum, metathorax, and 

 pleurae shining, the latter with a white bloom. Abdomen black 

 or brownish-black, with a black pubescence, usually reddish 

 chestnut-brown upon the sides of the first and second segments. 

 The feet are of the color of the thorax ; the fore tarsi usually alto- 

 gether dark brown ; the middle and hind tarsi towards their end 

 dark-brown to a great extent. Halteres yellowish-white. Wings 

 comparatively narrower than in T. incurva, attenuated to a rather 

 cuneiform shape towards their basis ; second longitudinal vein only 

 slightly wavy ; the small crossvein very steep, almost perpen- 

 dicular; the posterior crossvein oblique, its anterior end some- 

 what nearer the apex of the wing, so that the posterior angle of 



1 Tritoxa incurva occurs together with T.flexa, so that Dr. Schimer, who 

 Sent me specimens of both, took it for a mere variety of his onion-fly. 0. S. 



