NORTH AMERICAN DIPTERA. 227 



A REVIEW OF THE STRATIOxlIYIA AND OI>OXTO- 

 MYIA OF NORTH AMERICA. 



BY CHARLES W. JOHNSON. 



The object of this paper is to try and make clear the specific char- 

 acters of* the species that have been phxced in these two genera. That 

 there are many synonyms in the present list is apparent to all who 

 have attempted to determine the species. Of the species pertaining 

 to the United States I have examined a great deal of material, and 

 carefully studied all available types, but the want of material from 

 Mexico leave many doubtful and undetermined species. That some 

 of the species of Bellardi and Gerstaecker, described from Mexico, 

 are the same as those described from Texas and California, seem 

 evident, and if so, would have priority ; yet it would be unadvisable 

 to do this without a thorough study of the Mexican species. While 

 varying considerable in many structural chararcters, these variations, 

 when studied collectively, seem hardly sufficient to be of generic 

 importance. I therefore refrain in this present paper from adopting 

 any additional genera until typical specimens of described genei^a 

 have been studied. 



I here wish to express my sincere thanks to Mr. Samuel Henshaw, 

 through whose kindness I was permitted to examine the tyjje in the 

 Museum at C-ambridge ; to Dr. S. W. Williston and Mr. W. A. 

 Snow, of the Kansas University, for the loan of specimens, the 

 comparing of specimens with Day's types and valuable information ; 

 to Prof. C. V. Riley, for the privilege of examining the large collec- 

 tion in the National Museum ; to Prof. Lawrence Brunei* and Mr. 

 W. D. Hunter, of the University of Nebraska ; and to Prof. J. M. 

 Aldrich, Mr. D. W. Coquillett, Dr. W. A. Nason, Prof. G. C. 

 Davis, Mrs. Annie T. Slosson and others, for the generous loan of 

 specimens. 



STRATIOMYIA. 



Sf.ratiomys Geoffroy, Hist. Nat. d. In. ii, 475, 1764. 

 Stratiomyia, as amended by Loew. Centur. vi, 4.* 



Rather large ; black with yellow markings, pile or tomentum va- 

 riable. Head hemispherical; eyes of the male contiguous, but 



* " Geofifroy, in translating Eeaumur's Blanche armee, evidently meant to make 

 the name Stratiomyia and not Statiomys, which is nonsensical" (Osten Sacken). 



TRANS. AM. ENT. SOC. XXII. JULY, 1895. 



