300 C. R. Osten Sachen: a singular north-american fly. 



parallel to the costa, with a very narrow space between , and coa- 

 Icsccs with it unrler thc projection. 



Hab. Dallas, Texas (J. BoU); a Single male, labeled 26, IX., which 

 probably means Sept. 26. 



N B, The wings of this species somewhat resemble those of Ptero- 

 dontia, on account of the singular expansion of the costa. It may 

 be that this character is merely sexual. My description .shows the 

 principal points of difference between the venation of this species and 

 that of the european Oi?sebius (Pithogaster) inflatus figured by Loew 

 in the Wien. Ent. Monatschr. I, Tab. I. fig. 1 ; the profile of the body, 

 1. c. f. 2 is exactly like my 0. pterodontinus. 



Post-Script to p. 291. I should have stated that the venation 

 of ApJocera haruspex is not correctly described in the Western Diptera, 

 p. 284 (,,exactly like Dr. Philippi"s figure of Anypenus"). Dr. Hagen, 

 at my request, very kindly sent me a drawing taken from the original 

 specimen and my stateraents are based upon it. 



