78 DIPTERA OP NORTH AMERICA. 



little exceeds the basal cells. The two first black or brownish- 

 black bands are united on the costal border, so as to form an 

 inverted Y; the second of them runs from the stigma over the 

 transverse veins, and has a more inclined position than the first ; 

 the isolated third ban'd has a position similar to that of the second, 

 and seams the tip of the wing some distance beyond the tip of the 

 fourth longitudinal vein, without coalescing anywhere completely 

 with the border of the wing. 



Hob. Mississippi. (Schaum.) Washington. (Osten-Sacken.) 

 Observation. The Brazilian Urophora connexa Macq. (Dipt, 

 exot. Suppl. Ill, 64, Tab. VII, fig. 10) has the picture of the 

 wings rather similar to those of Tryp. polita. But being greenish- 

 black, and having the last band of the wings completely connected 

 with the preceding, and running straight on with the costal border, 

 but not reaching the tip of the third longitudinal vein, it is evi- 

 dently different from Tryp, polita. 



12. T. sparsa WIED. $ and 9. (Tab. II, fig. 13.) Fusca, alis latis- 

 simis, rotundatis, nigris, albido-guttulatis et margins apicali albo ornatis. 



Brown ; wings very broad and rounded, black with small drops, and the 

 apical border whitish. Long. corp. 0.27 0.30. Long. al. 0.26. 



SYN. Trypeta sparsa WIEDEMANN, Auss. Zweifl. II, 492. 

 Trypeta caliptera SAY, Journ. Acad. Phil. VI, 187, 3. 

 Platystoma latipennis MACQUAKT, Dipt. exot. II, 3, 200. Tab. XXVI, fig. 8. 

 Acinia novasboracensis FITCH, First Rep. etc. 67. 



Of a brownish-red, sometimes more brown color. Front broad, 

 brownish-yellow, frontal bristles black; the bristles of the poste- 

 rior orbit whitish-yellow. Antennae descending below the middle 

 of the face, their bristles with a short, but distinct pubescence. 

 Face excavated in the middle, and marked with two large deep 

 black dots ; another small deep black spot is between the antenna 

 and the anterior angle of the eye. Eyes with three very distinct 

 transverse bands. Palpi dark brown, usually blackish at the tip ; 

 suctorial flaps a little prolonged. On the upper side of the thorax 

 there are usually two or three darker longitudinal lines, and a 

 broad dark-brown edge of the lateral border. The short hairs of 

 the thorax and scutellura are whitish-yellow, the bristles of both 

 black. Of the four bristles placed in the middle of the thorax, the 

 two first are near the transverse suture. Pleurae above with whit- 



