OF WASHINGTON, VOLUME XII, 1!)10. 197 



additional species have been examined from Fort Collins, 

 Colorado, October 11, 1910; Forbestown, California, November 

 27, 1880 (Maggie Dowell); Livingstone, Vancouver^ October 

 1, 1896; California (Behrens); Boulder, Colorado, February 

 24, 1910 (S. A. Rohwer). 



Type: No. 13230, U. S. National Museum. 



This species has frequently been determined as Leptoglossus 

 cor at his Say on account of its most striking resemblance, but 

 by close observation the differently shaped expansion of the 

 hind tibiae will distinguish it at once. In Say's species the 

 expansion reaches with its outer side almost to the apex of the 

 tibiae, while in this new species the expansion on either side 

 extends but two-thirds of the length of the tibiae. 



The species belongs evidently to the Western fauna, and is 

 widely distributed from Colorado to California and north to 

 Vancouver. 



COQUILLETT'S "THE TYPE-SPECIES OF THE NORTH AMERI- 

 CAN GENERA OF DIPTERA."* 



BY FREDERICK KNAB. 



This work purports to be simply an indication of the type 

 species of the genera that have been used in connection with 

 North American Diptera. It will, however, be most valuable 

 for reference, supplementing the Aldrich Catalogue, from 

 which all generic references and synonymy have been omitted. 

 With the unusual, and perhaps unexcelled, library facilities 

 at Washington, and Mr. Coquillett's industry, it may be ex- 

 pected that the list of genera is fairly complete. That abso- 

 lute perfection in this respect cannot be reached is shown by 

 the series of corrections which have already been indicated. t 



Reliability as to the types indicated implies that every work 

 dealing with the genera in question has been gone over. In the 

 determination of the type species two processes are involved: 

 First, to determine if, in those genera which were founded 

 with several species originally included, a type species was not 

 indicated by the author of the genus or by some subsequent 

 author ; second, when no type species has been found indicated, 

 to designate the type. In the latter case there is always a 



*Proc. U. S. Nat. Mus. No. 1719 (vol. 37), pp. 499-647. Published 

 August 4, 1910. 



tCoquillett, D. W. Corrections to my paper on the type-species of 

 the North American genera of Diptera. Canad. Ent., vol. 42, pp. 375- 

 378 (November, 1910). 



