DESCRIPTIONS OF NEW GENERA AND SPECIES OF MUS- 

 COID FLIES FROM THE ANDEAN AND PACIFIC COAST 

 REGIONS OF SOUTH AMERICA. 



By Charles H. T. Townsend, 



Chief of the Estacion de Entomologla, Lima, Peru. 



The present paper contains descriptions of 72 species of muscoid 

 flies from South America, ail collected by myself except as otherwise 

 noted. Among these are the types of 37 genera, which are duly 

 characterized. Very many of these forms have been the subjects of 

 dissections and studies in the female reproductive system, reproduc- 

 tive habit, egg and first-stage maggot, and their naming and char- 

 acterization are thus especially called for. A preliminary paper 

 containing some of these species and giving some of the results of 

 these studies was published in the Annals of the Entomological 

 Society of America.* A few of the forms studied have also been 

 referred to in a paper reviewing Pantel's last work and published in 

 the Proceedings of the Entomological Society of Washington. ^ Since 

 the species named in these two papers were described only by giving 

 characters of the female reproductive system, full descriptions of the 

 adults are included in this paper. 



The types of all the forms here described are deposited in the U. S. 

 National Museum collections. I have taken the precaution to make 

 the particular specimens which furnished the dissections already re- 

 ferred to and which will be fully described and figured in a forthcoming 

 completed paper the actual type-specimens of the species, so that no 

 doubt may hereafter arise as to the identity of the forms treated and 

 figured. A separate TD number, meaning Townsend-Dissection num- 

 ber, is given to each specimen of fly dissected or otherwise connected 

 with the study of the reproductive system, habit, and early stages, and 

 in every case the dissections and early stages obtained from a par- 

 ticular individual fly bear its TD number. The early-stage and 

 reproductive-system material obtained by dissection may thus at any 

 time be referred to the individual adult specimen whence it came. 

 The type-specimens that have been dissected are duly noted in the f ol- 



1 Vol. 4, 1911, pp. 127-152 and 328-329. 2 Vol. 13, 1911, pp. 151-170. 



Proceedings U. S. National Museum, Vol. 43— No. 1935. 



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