14 PROCEEDINGS OF THE NATIONAL MUSEUM vou 72 



ing apophyses relatively short and very slender, the former a little 

 the longer. 



Hob itat. — ^Montana. 



Holotyfe.—MnlQ, Big Timber, July 14, 191Y (H. G. Dyar). 



Ty^e.— Male, Cat. No. 40327, U.S.N.M. 



LIMNOPHILA NIGROFEMORATA, new species 



Male. — Length about 10.5 mm. ; wing, 10.8 mm. 



Closely allied to L. mcdunnoughi Alexander (Alberta), differing 

 as follows : 



Tuberculate pits appearing as barely evident linear impressions at 

 the cephalic margin of the praescutum, one each on the inner margin 

 of the two intermediate praescutal stripes. Dorso-pleural membrane 

 brown, buffy surrounding the spiracles. Legs with the coxae scarcely 

 paler apically ; fore femora black, with about the basal fourth yellow ; 

 middle femora black, with approximately the basal third yellow; 

 posterior femora as in nncdunnoughi; fore and middle tibiae almost 

 black, the posterior tibiae paler. Wings with Bs angulated and 

 spurred at origin. 



Abdominal tergites dark brown, variegated with obscure yellow 

 immediately beyond the dark basal ring and transverse impressions 

 of each segment ; a blackish subterminal ring ; hypopygium brownish 

 yellow. Male hypopygium with the basistyle (fig. 7) relatively stout, 

 the dorsal lobe short and broad, with conspicuous setiferous tubercles. 

 Outer dististyle flattened but not as broadly so as in mcdunnoughi, 

 the distal half narrowed into a blackened apex that terminates in 

 two conspicuous teeth, the subapical one shorter and straighter ; sur- 

 face of style with abundant microscopic setae. Inner dististyle a 

 very small, stout fleshy lobe. Gonapophyses and aedeagus rela- 

 tively small and inconspicuous. 



Habitat. — Montana. Holotype^ male. Summit Station, altitude 

 5,200 feet, July 25 (J. M. Aldrich). 



Ty^e.— Male, Cat. No. 40328, U.S.N.M. 



In L. mcdunnoughi, the gray of the mesonotum is duller and 

 darker. The fore femur has the darkened apex of about the same 

 degree as in the other legs, but when specimens are fully colored 

 there is a distinct darkened ring beyond the midlength of the seg- 

 ment, followed by an ill-defined dull yellow annulus. Abdomen 

 uniformly darkened. Male hypopygium with the outer dististyle 

 even broader than in nigrofemorata, greatly flattened ; gonapophyses 

 more elongate, much exceeding the aedeagus. L. Tncdunnoughi is 

 still known only from Alberta (Nordegg, July 14, 1921, Mc Dun- 

 nough; Banff, July 18-25, 1922, Garrett). 



