12 PEOCEEDINGS OF THE ISTATIOlSrAL MUSEUM vol. 72 



anal vein large, subcircular; that of the first anal vein very small; 

 veins yellow, brown in the infuscated areas. Venation : Supernumer- 

 ary crossvein in cell M lying just beyond the level of the end of 

 vein second J., so the marks are not in alignment. 



Abdominal tergites dark brownish black, the bases of the seg- 

 ments broadly paler. Male hypopygium with the outer dististyle 

 (fig. 6) relatively short and broad, the outer margin at near two- 

 thirds the length with a small triangular flattened wing that is 

 microscopically toothed; the end of the style terminates in a slender 

 chitinized point; before this point, on the outer margin with numer- 

 ous subappressed spines; inner or lower margin of the style in the 

 angle of the apical spine microscopically denticulate. 



Habitat. — ^Alberta, Montana. Holotype^ male. Glacier Park Sta- 

 tion, Montana, altitude 4,800 feet, July 24 (J. M. Aldrich). Allo- 

 type^ female, Banff, Alberta, July 7, 1922 (C. B. Garrett). Para- 

 types, two males with allotype, July 28-30, 1922. Allotype in the 

 Canadian National Collection. 



Type.—M^lQ, Cat. No. 40325, U.S.N.M. 



This interesting Lim/nophila is named in honor of Dr. J. M. 

 Aldrich, to whom I am greatly indebted for very many kindnesses 

 in the past. 



LIMNOPmLA (PHYLIDOREA) COLUMBIANA, new species 



Male. — Length about 9 mm. ; wing, 9.5 mm. 



Closely allied to L. {P.) adusta Osten Sacken, differing especially 

 in the coloration and structure of the male hypopygium. 



Rostrum and palpi dark brown. Antennae with the basal seg- 

 ment dark brown, the succeeding three segments obscure brownish 

 yellow, the remainder of the flagellum passing into brown. Head 

 dark, grayish pruinose. 



Pronotum and mesonotum dark brown, the sides of the sclerites 

 paler, the surface with a sparse pollen; scutellum and postnotum 

 paler with a narrow dark brown median line. Pleura brown, with 

 a distinct microscopic pruinosity. Halteres pale, the knobs dark 

 brown. Legs with the coxae pale brown, sparsely pollinose; tro- 

 chanters obscure yellow; femora obscure yellow, the tips rather 

 narrowly and vaguely infuscated; tibiae obscure yellow, the tips 

 vaguely darkened; tarsi pale brown, the tips of the individual seg- 

 ments narrowly darker; terminal segment uniformly dark. Wings 

 subhyaline, the costal region slightly more yellowish; stigma oval, 

 dark brown; cord narrowly and very indistinctly seamed with 

 darker; wing apex not darkened; veins dark brown. Venation: 

 Bc^ ending shortly before the fork of Rs, Sg^ much longer, ending 

 just beyond this fork; Rs angulated and short spurred at origin; 



