180 



Jewett: Plecoptera 



Fig. 6:52. Terminalia of Acroneuria. a,f, pacifica; fa,c, ffieo- 

 dora; c/,e, californica; a,b,d, dorsal view of male; c,e,f, ventral 

 view of female (Needham and Claassen, 1925). 



— Supra-anal process about 1.2 times as broad near the 

 tip as it is near the base (figs. 6:49a*; ?, 6:5 lo); British 

 Columbia to California; Colorado 



borealis (Banks) 1895 



15. Supra-anal process with a short, upturned hook at the 

 tip, not club-shaped in lateral view (figs. 6:49c; ?, 

 6:51a); British Columbia to California; Montana to 

 Colorado coloradensis (Banks) 1898 



— Supra-anal process without a hook at the tip; club- 

 shaped in lateral view (figs. 6:47a; ?, 6:50c); California 



townesi Ricker 1952 



Family PERLIDAE 



This family is divisible into two well-characterized 

 subfamilies, the Perlinae of the Old World tropics 

 and temperate regions of Africa, Eurasia, and eastern 

 North America, and the Acroneurinae of the Americas 

 and eastern and southeastern Asia. The keys on 

 pages 159-160 and 162-163 will separate the sub- 

 families and genera found in North America, and the 

 following key includes the recognized American sub- 



Fig. 6:53. o, Pe/toper/o quadri spinula, aedeagal structure 

 through the ninth sternite; b, Nemoura spiniloba, ventral view of 

 male terminalia; c, Capni'o mocu/ota, lateral view of male ter- 

 minalia; d, Isogenus alameda, ventral view of female terminalia; 

 e, /soper/o marmoraia, lateral view of male terminalia; f, Alio- 

 per/a chandleri, lateral view of male terminalia (Jewett, 1954b). 



genera and the three California species of Acroneuria 

 Pictet 1841. 



Key to North American Subgenera and 

 California Species of Acroneuria 



1. Fore wings suddenly widened beyond the origin of Rs; 



color wholly yellow; Appalachian (subgenus 



Eccoptvra Klapalek 1921) xanthenes (Newman) 1828 



— Fore wings gradually widened to stigma; not wholly 

 yellow 2 



2. Grooves of the mesosternum widely divergent 3 



— Grooves of the mesosternum short and nearly parallel 

 (fig. 6:52a,/); nymph with anal gills; British Columbia 

 to California; Montana to Colorado. . .(synonyms: A. 

 pumila Banks 1906, H. obscura Banks 1938, A. delta 

 Claassen 1937) (subgenus Hesperoperla Banks 1938) 

 pacifica Banks 1900 



3. Ninth abdominal sternite of male bearing a triangular 

 disc or hammer; Georgia, North Carolina, Tennessee 

 (subgenus Beloneuria Needham and Claassen 1925) 



georgiana (Banks) 1914 



— Ninth abdominal sternite of male bearing an oval or 

 longitudinally rectangular disc or hammer 4 



4. Hammer of male elongate-rectangular; nymph with a 

 fairly complete row of spinules across the occiput; 

 western North America .. .(subgenus Calineuria Ricker 

 1954) 5 



— Hammer of male transversely oval; nymph with or 

 without a row of spinules across the occiput; eastern 

 North America 6 



5. Head and thorax blackish (fig. 6:526, c); ocellar triangle 

 dark in nymph, and head and thorax not strikingly 

 patterned; Oregon and California, Montana and Wyoming 

 theodora Needham and Claassen 1922 



— Head and thorax brownish (fig. 6:52a",e); ocellar triangle 

 yellow in nymph, and head and thorax strikingly pat- 

 terned; British Columbia to California 



californica (Banks) 1905 



6. Nymph with a wavy but complete row of spinules across 

 the occiput. . .(subgenus Attaneuria Ricker 1954) . . . 



ruralis (Hagen) 1861 



— Nymph without a row of spinules across the occiput 

 (subgenus Acroneuria, s.s.) 



