188 THOMAS SAY FOUNDATION 



Abdomen blackish brown above, the last two segments 

 and the ventral surface lighter. Tails dark brown, hairy. 

 Distribution. — Type locality, Washington. 



Canada, Maligne Lake, Alberta, July 1-3, 1915 



(E. L. Diven) ; Waterton Lakes, Alberta, July 



21, 1923 (J. McDunnough). 

 Colorado, Gunnison, Julv (Oslar) ; Tolland (G. 



S. Dodds). 

 Oregon, Elkton, March 26, April 5, 1896; Cor- 



vallis, June. 

 California, Dunsmuir, Shasta Co.; Cisco, 1899; 



Yosemite Valley, June 12, 1921 (E. C. 



Van Dyke) ; Nevada Co., May 16, 1918 (E. R. 



Leach). 

 Wyoming, Yellowstone River, Aug. 5, 1921 (F. 



M. Sallee) ; Upper Falls, Yellowstone, Aug. 9, 



1896 (R. P. Currie) ; Yellowstone River, July 



21, 1921 (R. A. Muttkowski). , 

 Montana, Bridger Mts., June 19, 1914, 5,000 it. 

 Washington. Olympia, June 1, 1894. 



Acroneuria pumila Banks. 



(Plate 29, figs. 5, 6; plate 30, fig. 15.) 

 1906. Acroneuria pumila Banks, Can. Ent., 38:335. 

 1922. Acroneuria pumila Xeedham and Claassen, Can. Ent., 54:253. 



Length to tip of wings, female, 17 mm. Expanse, fe- 

 male, 26 mm. 



Color shining yellowish brown. Head uniformly yel- 

 lowish except the posterior angles which are a little dark- 

 er. Frontal tubercles are elongate, transverse ridges that 

 extend well forward nearly opposite the middle ocellus. 

 Ocelli ringed with black, antennae and palpi brown. 



Prothorax wider than long, distinctly narrowed behind, 

 remarkably rounded in front and somewhat rounded in 

 the rear, especially on the angles. General color yellow- 

 ish brown with darker margins, the surface rugose on 

 each side, middorsal smooth space very wide, especially at 

 its ends. Meso- and metathorax darker yellowish brown 

 and uniform in color. Legs brown. Wings abbreviated, 

 a little longer than the abdomen, subhyaline with the 

 ends a little darker, especially in the vicinity of the anal 

 cell. In the forewings many costal apical crossveins. 



Abdomen brown, paler beneath. Tails brown, hairy, the 

 hairs longer on the basal segments. 



