Vol. 31, pp. 65-68 June 29, 1918 



PROCEEDINGS 



OF TH E 



BIOLOGICAL SOCIETY OF WASHINGTON 



NOTES AND DESCRIPTIONS OF SOME ANTHOMYIID 



GENERA. 



BY J. R. MALLOCH. 



The matter contained in this paper is presented now in order 

 to make possible the subsequent presentation of generic keys to 

 the family Anthomyiidae. The generic concepts of different 

 authors are vague and varied, and with a view to clearing up 

 the generic status of at least the American forms I have obtained 

 from Dr. Villeneuve and Mr. P. H. Grimshaw genotypes of 

 many of the European genera upon which I have based my 

 generic concepts. The limits of these genera do not coincide 

 with those defined by European authors, probably owing to the 

 fact that the characters now used by me were ignored or over- 

 looked by those authors, or else consideration of genotypes was 

 deemed unnecessary by them. 



Mydaea Robineau Desvoidy. 



Genotype, Musca pagana Fabricius. 



This genus contains about six North American species. The described 

 species known to me are, pagana Fabricius, urbana Meigen, obscicra 

 Stein, nigricolor Fallen. The last species I have a slight doubt about, as 

 I have not compared it with European material ; the specimens are from 

 Plummer's Island, Md., and Little Falls, D. C. ( \V. L. McAtee). 



The third vein is bristly at base in both sexes and the female has the 

 penultimate genital segment armed with spines on venter. 



Aricia Robineau Desvoidy. 



Genotype, Musca impuncta Fallen. 



The genotype differs from Phaonia R. D. in having no calcar on hind 

 tibia. There are many North American species of this genus. 



19— Proc. Biol. Soc. Wash.. Vol. 31, 1918. (65) 



