192 THOMAS SAY FOUNDATION 



Acroneuria theodora Needham and Claassen. 



(Plate 16, fig. 9; plate 28, figs. 21, 22, 23; plate 30, fig. 4.) 

 1922. Acroneuria theodora Needham and Claassen, Can. Ent., 54: 



2 r,4. 



Length to tip of wings, male, 15 mm.; female, 35-37 

 mm. Expanse, male, 20 mm. ; female, 59-63 mm. 



General color blackish with smoky wings. Head a little 

 wider than prothorax ; black over the ocellar triangle and 

 extending laterally to the base of the antennae; occiput 

 and area in front of the frontal M-ridge dark brown ; fron- 

 tal ridge and lateral tubercles yellowish ; ocelli form an 

 equilateral triangle ; hind ocelli closer to each other than 

 to the eyes. Antennae blackish at base, brown towards 

 the tip. Prothorax uniformly blackish, wider than long, 

 somewhat narrowed behind ; front angles sharp, hind 

 angles rounded; rugosities rather strong. Wings pale 

 yellow at base, beyond uniformly smoky ; veins blackish ; 

 no crossveins in the outer field beyond the cord. Basal 

 half of abdomen yellowish above, beyond blackish. Tails 

 brown, thickly clothed with short hairs. 



Male brachypterous ; ninth ventral segment bears a 

 large, longitudinally rectangular hammer whose surface 

 is covered with rearward curving ridges ; subanal lobes 

 cylindrical, short and sharp. 



Female. Eighth ventral segment unmodified. 



Distribution. — 



Wyoming, Big Horn Mts., June 18, 1896 (R. P 



Currie). 

 Montana, Gallatin Mts., Aug. 15, 1914, 6,000 ft., 

 Yellowstone Park, Gallatin Mts., Aug. 14, 

 1921 (R. H. Muttkowski). 



Acroneuria californica Banks. 



(Plate 28, figs. 17-20; plate 30, fig. 1.) 

 1905. Acroneuria californica Banks, Invert. Pacifiea, 1 :87. 

 1905. Acroneuria californica Banks, Trans. Am. Ent. Soe., 32:3. 

 1908. Acroneuria concolor Banks, Trans. Am. Ent. Soe., 34:255. 

 1922. Acroneuria californica Needham and Claassen, Can. Ent., 54: 

 253. 



Length to tip of wings, male, 23 mm.; female, 31 mm. 

 Expanse, male, 40 mm.; female, 54 mm. 



Color brown, varied with yellow. 



Head pale, area over ocellar triangle pale reddish yel- 

 low; clypeus also lighter; a dark spot each side between 

 the front ocellus and the lateral tubercles, rear of head 

 darker ; tubercles yellowish, distinct ; frontal ridge rather 

 weak ; the ocelli form an almost equilateral triangle ; hind 



