10 PROCEEDINGS OF THE NATIONAT. MUSEUM vol. 69 



New York: Wilmot, June 1-15, 1887 (J. H. Coin- 

 stock). Adirondack Mountains, Mount Seward, 

 4,500 feet, June 22, 1901 (A. 1). MacGillivray). 

 Ithaca, May 22, 1901 ((3. A. Johannsen). 



Virginia: Maywood, April 21, 1916 (W. L. Mc- 

 Atee). Scott's Run, April 11, 1912 (W. L. Mc- 

 Atee). Dead Run, March 18-April 19, 1914-1916 

 (R. C. Shannon). Great Falls, April ;i, 1922 

 (H. S. Barber). Vienna, April 18, 1915 (W. L. 

 McAtee) . 



PROSIMULIUM EXIGENS. new species 



Close to hirtipes. Antennae entirely blackish; third joint broader 

 than long; antepenultimate palpal joint moderately enlarged; pile 

 entirely pale: legs ^^ellowish, apices of tibiae and all tarsi darkened; 

 stem vein pale pilose. 



Ovipositor : Long and stout but not reaching beyond middle of 

 anal lobes. Lobes conical, equal or slightly exceeding the cerci, 

 llnely setose above, more coarsely so below but intergrading. Gen- 

 ital rod forked, each arm with a triangular chitinous expansion. 

 (Figs. 3 and 4.) 



Male hypopygium. Side pieces conical, stout, and strongly chit- 

 inized, longer than wide; chitin absent on one side (within), a 

 small detached piece at base lying obliquely ; bridge piece narrow, 

 widening below and joining the basal prongs of the adminicuhmi. 

 Clasper stout, conical, with three terminal claws. Adminiculum 

 transverse, the center forming a projecting point, pilose, the angles 

 stronglj^ shouldered rounding over to the broad basal prongs. 

 Membranous arms without hooks, granular. (Figs. 30 and 31.) . 



Type locality. — Moscow, Idaho. 



Cotypes, two males, allotype female, Cat. No. 28329. U.S.N.M. 



Three female specimens at hand, two males. The females are 

 scarcely distinguished from hirtipes; the male structures very 

 different. 



Distribution. — Colorado: Custer County (T. D. A. Cockerell) 

 (no male). 

 Idaho: Moscow Mountain June 1, 1907 (J. M. 

 Aldrich), Moscow (J. M. Aldrich). 



PROSIMULIUM PANCERASTES. new species 



Near exigens. Differs in having the basal antennal joints yellow; 

 the legs and the pile more deeply yellow. 



Ovipositor: Essentially as in exigens. (Figs. 16 and 17.) The 

 female specimen is from Lawyers Can^^^on, whereas the male type is 



