PLECOPTERA OF NORTH AMERICA 39 



decurved, its sperm cup placed within an apical dilatation 

 of the descending arm as in that species. Subanal plates 

 broad. 



Female. Eighth sternite produced in a broadly rounded 

 lobe and bearing at midway the length of the segment 

 two very large elongate-triangular processes that reach 

 rearward beyond the middle of the 9th sternite. 



Distribution. — Mission, British Columbia, down the 

 west coast to Palm Springs, Southern California. 



This species is somewhat earlier in season. Specimens 

 from Shasta Springs, Calif., collected by T. E. Snyder 

 bear date of June 23 ; and the species was found by the 

 senior author in the height of its transformation at St. 

 Andreas Canon, near Palm Springs, Calif., in April. 



Pteronarcys proteus Newman. 



(Plate 7, figs. 11, 12, and text fig. 2.) 



1838. Pteronarcys proteus Newman, Ent. Mag., 5:377. 



]873. Pteronarcys proteus Hagen, Proc. Bost. Soc. Nat. Hist., 15:283 

 (nymph). 



3907. Pteronarcys spinosa Banks, Proc. Ent. Soc. Wash., 8:8. 

 1917. Pteronarcys proteus Smith, Trans. Amer. Ent. Soc, 43:452 

 (full bibliography of 9 titles). 



Male. Length to wing tips 33 mm. ; of antennae 17 

 mm. ; of tails 7 mm. ; expanse of wings 56 mm. 



Female. Length to wing tips 40 mm. ; of antennae 20 

 mm. ; of tails 7 mm. ; expanse 70 mm. 



Color dark brown ; frontal tubercles rufous. A narrow 

 obscure rufous median line upon the disc of the prothorax. 

 Venter varied with testaceous or obscure rufous, deepen- 

 ing on the abdomen. 



Head a little narrower than the prothorax, the latter 

 slightly widened posteriorly, sides and front border of 

 disc straight, rear margin convex; angles square. Wings 

 dusky. 



Male. Ninth ventral segment moderately produced, not 

 wholly covering the sternite of 10, upturned and evenly 

 rounded in the rear. The ninth tergite bears a horny 

 rounded projection that arises from its rear and is di- 

 rected forward upon the apex of 8 middorsally and closely 

 laid upon the tergum. Tenth segment almost covered by 

 the 9th below, and bifid above in a pair of rounded lobes. 

 Subanal plates spoonshaped together clasping between 

 them the base of the supra-anal plate which is modified 

 into slender erect, recurved, probe-like organ, utterly dif- 



