AMERICAN DIPTERA. 



331 



A HOLOGRAPH OF THE NORTH AMERICAN 

 PHORID,E. 



BY CHARLES THOMAS BRUES, M. 8. 



The present work was begun several years ago, by Prof. J. M. 

 Aldrich, of the University of Idaho, by whom all the material was 

 collected. At that time a number of the new species were described, 

 but owing to work on his catalogue of the North American Diptera, 

 Professor Aldrich was compelled to discontinue work on the Phorhhe. 

 At his suggestion, the collection was sent on to me, together with the 

 descriptions of new species already prepared. In the text I have 

 placed such descriptions in quotation marks and the initials J. M. A. 

 after them in parentheses. This signifies that the original descrip- 

 tion was drawn up by Professor Aldrich. 



The material was derived from various sources. A large portion ' 

 of it was collected by Professor Aldrich in Dakota, Idaho, and at 

 Lawrence, Ivans. A large number of the eastern species were col- 

 lected by Mr. C. W. Johnson, and many from the middle west by 

 Dr. William M. Wheeler. Acknowledgments are also due to Dr. 

 Garry de N. Hough for many eastern and southern forms, to Mr. 

 A. L. Melander for Texan species, to the National Museum for the 

 loan of some types, to the University of Kansas, Stanford University 

 and Cornell University. Specimens have also been obtained from 

 Dr. Nason, Dr. Kertesz and Mr. Trevor Kincaid. The West Indian 

 forms were loaned by the British Museum. 



I have examined the types of Loew's species in the Museum of 

 Comparative Zoology at Cambridge, the types of Prof. Aldrieh's 

 West Indian species (loaned by the British Museum), as well as the 

 types of some species described by Coquillel and those by Lintner 

 and Felt. An European collection identified by Strobl has been a 

 great help in detecting the identity of certain American and Euro- 

 pean species. 



A set of types of the new species described have been placed in 

 the U. S. National Museum. 



In conclusion I wish to express my most sincere thanks and 

 appreciation to Prof. Aldrich for his many valuable suggestions and 

 criticisms, as well as for his generosity in placing the collection in 

 my hands. 



TRANS. AM. ENT. SOC. XXIX. OCTOBER, 190o. 



