16 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.68 



although there is a deep groove. The anterior forceps are shining 

 brown, large, considerably curved forward toward the apex and they 

 have on the posterior and inner edge a groove beginning at the tip 

 of the posterior forceps and extending nearly to their own apex. 

 The thin margins of this groove curve slightly up or down, con- 

 siderably changing the shape of the organ. The fifth sternite has a 

 wide excision, with a cluster of hairs each side, and outside of this 

 another excision beyond which are about three bristles. This is 

 practically the same in argentea. The female can be distinguished 

 by the character given in the table — the terminal hooks of the last 

 genital segment being attached below a square shoulder with which 

 they are nearly jjarallel in profile. There are no special groups of 

 spines on the venter. 



Length, 9 to 11.5 mm. 



Redescribed from 35 specimens, of both sexes. Of these 26 are 

 in the National Museum, including 16 from the District of Columbia 

 and adjacent parts of Maryland and Virginia, collected by Town- 

 send, Currie, Quinter, Shannon, Crawford, and Walton. The rest 

 are from Franconia, New Hampshire (Townsend)^ Ohio (Rein- 

 hard) ; Union Springs, New York (Anderson) ; Clementon, New 

 Jersey (Johnson) ; White Springs, Florida (Townsend) ; College 

 Station, Texas (Reinhard) ; Galveston, Texas (Trotter) ; Boulder, 

 Colorado (Cockerell). 



In C. W. Johnson's collection are five specimens, from Province- 

 town, Massachusetts (Morse) ; Durham, New Hampshire (Brid- 

 well) ; Manomet, Massachusetts (Johnson) ; Monmouth, Maine 

 (Frost), and Wellesley, Massachusetts (Morse). 



In Professor Hine's collection are three specimens, from Hinckley, 

 Ohio (Hine) ; Bluffton, Indiana (Williamson), and Golden, Colo- 

 rado (Hine). 



In the California Academy of Sciences is one s[)ecimen from San 

 Marcial, Socorro County, New Mexico (Duncan). 



In the TTniversity of Kansas collection are 9 specimens, from 

 Connecticut (Williston) ; Illinois (Forbes) ; South Illinois; Ithaca, 

 New York; Ames, Iowa; Pennsylvania; Minnesota, and Galveston, 

 Texas (Snow). 



CYLINDROMYIA ALTICOLA. new species 

 (Figs. 13, 24) 



The only North American species at present known in which the 

 abdomen is entirely shining without any pollinose markings. Frontal 

 stripe decidedly red, at the middle about three times as wide as 

 either parafrontal, the latter and the parafacial silvery; the para- 

 facial at narrowest is hardly wider than the third antennal joint. 



