368 Annals of the Carnegie Museum. 



Drosophila costata Zetterstedt^' and D. nigrimana Meigen^^ may be- 

 long in the same group as amcena and procnemis, judging from the 

 statement by Professor Strobl above cited that they have the lower- 

 most fronto-orbital situated very near the antenna and closer to the 

 eye (he does not mention the directions of the bristles) ; D. costata has 

 the evident black costa and black front legs much as in procnemis, 

 but the latter has the last four joints of front tarsi whitish. D. proc- 

 nemis has eyes in life pale, rather than dark, purplish, with a slightly 

 shining reflection of green or bluish green in certain lights, especially 

 below. I have taken this species at sap on trunks of Rohinia pseud- 

 acacia Linnaeus together with Aulacigaster rufitarsis Macquart ancl 

 Traginops irrorata Coquillett and on windows, at Lawrence, Kansas; 

 on windows at Urbana, Illinois; and at sap of trunks of Acer ruhrum 

 Linnaeus together with the same species as above of Aulacigaster and 

 Traginops and on windows at Pittsburgh, Pennsylvania. There is a 

 specimen of D. procnemis in the Carnegie Museum from Chapada, 

 Matto Grosso, Brazil, collected in Oct., by H. H. Smith (Carn. Mus. 

 Ace. 2966). It is absolutely identical with North American speci- 

 mens, and though by an accident it has been quite broken up, enough 

 still remains to clearly identify it beyond a doubt. Drosophila amcena 

 Loew is a common North American species with eyes in life quite 

 light blood-red; I have taken this pretty species on windows and at 

 sap on trunks of different trees at Lawrence, Kansas, at Urbana, 

 Illinois, at Pittsburgh and Ohio Pyle, Pennsylvania; and there arc 

 specimens in the Carnegie Museum from Westmoreland Co., Pennsyl- 

 vania, and Cheat Mts., W. Va., collected by H. H. Smith. 



Before giving the characters of Leucophenga I desire to explain 

 certain terms used, not as new expressions, but that there may not 

 be the slightest misconception of my definitions. 



Supra-alar bristles (anterior supra-alar bristles of Osten-Sacken^^) : 

 I designate as such those along the upper edge of the supra-alar 

 cavity, anterior to the transverse ridge (alarfrenum of Osten-Sacken^") 



Post-alar bristles (posterior supra-alar bristles of Osten-Sacken) -P 

 I thus designate those on the post-alar callus, with the strong anterior 

 bristle situated at the top of the transverse ridge (alar frenum), which 

 divides the supra-alar cavity, and the posterior bristle close to the 



'^'^ Dipt. Scandin., VI (1847), p. 2552. 



>2 System. Beschr. Europ. Zweift. Ins., VI (1830). p. 87. 



" Trans. Ent. Soc. London, 1896, Part III, p. 413. 



