274 NORTH AMERICAN TRYPETINA. 



vein ; two large spots of the same color lie in the exterior costal 

 cell and fill out a large portion of it; a double spot of the same 

 color is in the marginal cell immediately beyond the stigma ; 

 finally, there are two large spots of the same kind on the second 

 longitudinal vein, the one upon its root, the other below the 

 double spot in the marginal cell. The basis of the exterior costal 

 cell is irregularly reticulate with very small drops. A small hya- 

 line spot is situated between the double spot of the marginal cell 

 and the end of this cell, filled out by the common origin of the 

 three crossbands which occupy the apex of the wing. The third 

 longitudinal vein is distinctly bristly, gently curved forward before 

 its end and as gently backwards ; posterior crossvein long, but 

 not as long as in T. latipennis Wied. 



Hub. Cuba (Otto) ; in the Berlin Museum. 



Observation. — The present species forms, with T. latipennis 

 Wied. and a group of related species from South America, an 

 easily recognizable genus, very well characterized by the breadth 

 of its large wings, their outline, which reminds of Phasia, and 

 their peculiar picture. These species also have the structure of 

 the head and the bristly third vein in common. I adopt for this 

 genus, apparently exclusively American, the name of Acrotsenia, 

 in allusion to the most striking peculiarity of the picture of the 

 wings. 



29. T. sparsa Wied. % 9. (Tab. X, f. 13.) — Fusca, alae latissimse, 

 subrotundatae, nigrse, albido-guttulatre, apice albido-marginato oruatse. 



Brown ; wings very broad, almost round, black, with whitish drops, and 

 the apex margined with white. Long. corp. % 0.15 — 0.27 ; 9 cum 

 terebra 0.19—0.30; long. al. 0.16—0.26. 



Syn. Trypeta sparsa Wiedemann, Auss. Zweifl. II, p. 492. 

 Trypeta caliptera Say, Journ. Acad. Phil. VI, p. 187, 3. 

 Platystoma latipennis Macquart, Dipt. Exot. II, 3, p. 200. Tab. XXVI, 



f. 8. 

 Acinia novaboracensis Fitch, First Report, 67. 

 Trypeta sparsa Loew, Monographs, etc., I, p. 78. Tab. II, f. 13. 



Hab. Northern Wisconsin River (Kennicott) ; Texas (Bel- 

 frage). 



Observation 1. — Trypeta sparsa Wied. is either a very vari- 

 able species, both in its size and in the shape of its wings, or else 

 several species are mixed up here, which, owing to the insuffi- 



