OF WASHINGTON, VOLUME XIII, 1911. 179 



in such widely separated localities seemed to him improbable; 

 but he admitted in his first paper that he could not find good 

 distinguishing characters between the Brazilian and North 

 American specimens. In the second paper Lutz calls the 

 Brazilian form pertniax\ he states that owing to the great re- 

 semblance of the images of certain species the identity of 

 forms from such widely separated localities can be considered 

 established only by comparison of the pupae. Lutz points 

 out further that specimens sent to him from Washington as 

 vemistum do not agree with Johannsen's description for the 

 same species and that there is every reason to believe that a 

 number of species have been confused under this name by 

 North American entomologists. Simiilium pcrflannii Ron- 

 band was determined by Coquillett as S. ocnracciim Walker, 

 described from Mexico, but Lutz discarded this synonymy be- 

 cause his specimens would not agree with the description of 

 Walker. The following synonymy results from Dr Lutz's 

 two papers: 



S. montanum Lutz, 1909 (not Philippi) - - pernigrum Lutz, 1910. 



S. venustum Lutz, 1909 (not Say) == pertinax Kollar. 



S. venustum var. infuscata Lutz, 1909 = infuscatum Lutz, 1910. 



S. nigrimanum Lutz, 1909 (not Macquart) + "albimanum" 

 orbitale Lutz, 1910. 



S. incertum Lutz (pupa) == paraguayense Schrottky. 



S. hebeticolor Lutz = simplicicolor Lutz. 



Lutz suggests the possibility of the following synonymy; 

 this must not be considered established until more carefully 

 investigated: 



S. inexorabile Schrottky (? == "venusticm" - pertinax Kollar.) 



S. minusculum Lutz (? == amazonicum Goeldi). 



S. sequifurcatum Lutz (? -= incrustatum Lutz, var.) 



S. diver sibranchium Lutz (? = infuscatum Lutz). 



S. spinibranchium Lutz (? - subpallidum Lutz). 



S. botulibranchium Lutz (? == distinctum Lutz). 



S. diversifurcatum Lutz (? == subnigrum Lutz. var.). 



S. brevifurcatum Lutz (? = auristriatum Lutz). 



