NOTES ON SOME ACALYPTRATE FLIES IN THE UNITED 

 STATES NATIONAL MUSEUM 



By John R. Malloch 



Biologist, United States Bureau of Biological Survey 



INTRODUCTION 



During recent years I have given some of spare time to a partial 

 study of the Oriental and Australasian Ortalidae, using for the 

 greater part of the work the material in the collection of the United 

 States National Museum, and having found in that collection some 

 undescribed species, coupled with a few interesting characters seem- 

 ingly overlooked by other writers on the family, I am presenting 

 herein a summary of some of my findings. I also present herein 

 descriptions of Helomyzidae and Periscelidae. 



The types of the new species are in the collection of the United 

 States National Museum. 



Genus EUPROSOPIA Macquart 



Euprosopia Macquart, Dipteres Exotiques, Suppl. 2, p. 89, 1847. 



This genus is distinguished from its allies by the very large lower 

 calypter, which is quite as expansive as in many Tachinidae and 

 would appear to belie the name "Acalyptrate " as applied to the sub- 

 family to which it belongs, the presence of hairs or setulae on the 

 posterior side of the upper surface of the stem vein as in certain 

 Calliphoridae, and the flattened central carina of the face with its 

 deep lateral antennal foveae. The species are characteristically 

 marked on the wings with many dark spots or interrupted fasciae, 

 and in one species, which is described herein, the wings are con- 

 spicuously fasciate with black. 



The genus contains some well-defined segregates which might rea- 

 sonably be accepted as at least subgenera. In the group in which 

 the tegulae, or a process below these, extend forward along the noto- 



No. 2858.— Proceedings U. S. National Museum, Vol. 78, Art. 15. 



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