PLECOPTERA OF NORTH AMERICA 211 



above; subgenital plate not much produced; ventral lobe 

 about three times as long as wide. 



Female. Seventh sternite slightly produced in middle, 

 eighth sternite with a deep median notch ; ninth sternite 

 with a dark spot each side. 



Distribution. — Type, male, No. 11358, from Colorado 

 (Banks Collection Mus. Comp. Zool., Cambridge, Mass.). 



The following additional specimens are in the Banks 

 Collection ; one female, July 29, 1907, one male, July 23, 

 1907, one female, July 27, two females, Aug. 5, 1907, 

 Florissant, Colo. (S. A. Rohwer) ; one male, June 10, Fort 

 Collins, Colo.; one male, Aug. 12, 1907, Chimney Gulch, 

 Golden, Colo. ; one female, Aug. 22, 1907, Boulder, Colo. 

 (S. A. Rohwer). 



We have specimens from the following localities : June 

 27 to July 8, 1906, Florissant, Colo. (T. D. A. Cockrell) ; 

 Manitou, Colo., 1877 (Morrison). 



Nemoura producta Claassen. 



(Plate 37, figs. 1-4.) 

 1923. Nemoura producta Claassen, Can. Ent., 55:286. 



Length to tip of wings, male, 11 mm.; female, 11.5 mm. 

 Expanse, male, 20 mm. ; female, 21 mm. 



General color brown to blackish brown. Head wider 

 than prothorax nearly smooth ; hind ocelli a little closer 

 to eyes than to each other. Prothorax wider than long, 

 slightly narrowed behind; angles quite sharp. Legs 

 brown, not banded. Wings subhyaline ; 1st A and 2nd A 

 of f orewing united before margin ; anal field of hind wings 

 large. Gills apparently absent. 



Male. Subanal lobes broad, produced, upcurved and en- 

 larged at tip (side view), on the inside (ventral view) 

 armed with a stout spine-like process; cerci small, mem- 

 branous ; supra-anal process bent up but not recurved, 

 with chitinous structures surrounded by a finely spinulose 

 membrane; subgenital plate long, narrow; ventral lobe 

 about three times as long as wide. 



Female. Seventh sternite produced into a narrow, 

 evenly rounded subgenital plate which reaches across 

 most of segment eight; eighth sternite unmodified. 



Holotype, male, allotype, female, without any label. Cor- 

 nell University Collection. 



