PLECOPTERA OF NORTH AMERICA 21,5 



Nemoura vallicularia Wu. 



(Plate 38, figs. 1-4.) 

 1923. Nemoura vallicularia Wu, Bulletin Lloyd Library No. 23, Ento- 

 mological series No. 3:1-47.* 



Length to tip of wings, male, 11 mm. ; female, 12.6 mm. 

 Expanse, male, 17.5 mm. ; female, 19.5 mm. 



General color blackish brown. Head a little wider than 

 prothorax ; hind ocelli little closer to eyes than to each 

 other; antennae dark brown. Prothorax dark brown, 

 somewhat lighter on sides ; wider than long ; slightly nar- 

 rowed behind; angles broadly rounded. Legs yellowish 

 brown. Wings uniformly smoky ; 1st A and 2nd A of 

 forewing united before margin; anal field of hind wings 

 large. Gills absent. 



Male. Subanal lobes, as viewed from side, flask shaped, 

 recurved over body, truncate at tip; cerci very small, 

 membranous; supra-anal process not recurved but di- 

 rected upward and slightly backwards; subgenital plate 

 rather narrow, long and turned up at right angles ; ventral 

 lobe about two and one-half times as long as wide. 



Female. Seventh sternite produced over entire eighth 

 segment into a narrow subgenital plate which is evenly 

 rounded behind ; eighth sternite unmodified ; ninth ster- 

 nite with a small round blackish spot each side. 



Distribution. — Holotype, male, allotype, female, Ithaca, 

 N. Y. Cornell University Collection. Many males and fe- 

 males, April and May, Ithaca, N. Y., and vicinity ; June 20, 

 Monmouth, Me. (C. A. Frost) ; March 28, Mosholu, N. Y.; 

 March 6, 1902, Nassau, N. Y.; March 31, 1902, Ilion, N. 

 Y. ; April 10, 1903, Clinton, N. Y. ; April 14, Riverton, N. 

 J. ; 1877, Morganton, N. C. (Morrison) ; May, 1912, Sun- 

 burst, N. C. (F. Sherman). 



Nemoura carolinensis Claassen. 



(Plate 38, figs. 5-7.) 

 1923. Nemoura carolinensis Claassen, Can. Ent., 55:287. 



Length to tip of wings, male, 9 mm. Expanse, 16 mm. 



General color brown. Head wider than prothorax, uni- 

 formly brown; hind ocelli closer to eyes than to each 

 other. Prothorax wider than long, uniformly brown, 

 slightly rugulose, considerably narrowed behind, angles 

 narrowly rounded. Legs uniformly brown. Wings uni- 

 formly subhyaline ; anal field of hind wings narrow. Gills 

 apparently absent. 



*This paper contains, besides the technical description, a very complete account 

 of the morphology, anatomy and biology. 



