PLECOPTEKA OF NORTH AMERICA 18? 



Male. Ninth ventral abdominal segment with a slight- 

 ly oval, transverse, polished hammer ; genital hooks cylin- 

 drical, sharp, usually curved outward toward the tip and 

 reaching to or a little beyond the middle of segment 10; 

 segments 9 and 10 above each side with a patch of short 

 spines. 



Female. Eighth ventral segment produced in the mid- 

 dle into a rather narrow subgenital plate which reaches 

 half way across segment 9. At the base of the plate is a 

 declivity. The plate is either evenly rounded behind, 

 truncate, or slightly emarginate and sometimes there is 

 a slight emargination on the sides of the plate at the 

 base. 



Type female in the Hofmuseum, Berlin. 

 Distribution. — Type locality, New Orleans. 



Kansas, Douglas Co., July; Baldwin; Riley Co. (J. 

 B. Norton) ; Manhattan, July 1, 1921 (R. C. 

 Smith) ; Lawrence, July, 1894 (Hugo Kahl) ; 

 June 20-26, 1921 (P. W. Claassen). 

 Ohio, Catonbads, June 23. 

 Missouri, Columbia (C. V. Riley). 



Acroneuria pacifica Banks. 



(Plate 4, figs. 11, 12; plate 16, fig. 3; plate 29, figs. 7, 9, 10; plate 

 30, fig. 3.) 

 1900. Acroneuria pacifica Banks, Trans. Amer. Ent. Soc, 26:242. 

 1904. Acroneuria nigrita Banks, Trans. Amer. Ent. Soc, 30:98. 

 1922. Acroneuria pacifica Needham and Claassen, Can. Ent., 54:253. 



Length to tip of wings, male, 32 mm. ; female, 37 mm. 

 Expanse, female, 58 mm. 



Color dark brown except the head, the general color of 

 which is yellowish. There is a blackish area over the en- 

 tire ocellar triangle, delimited in front by the yellow that 

 covers the M-line and that extends rearward along the in- 

 ner margin of the eye and covers most of the rear of the 

 head. Middle of clypeus and labrum brownish, frontal 

 tubercles yellowish. Ocelli small, the middle one smaller 

 than the others. Antennae and palpi brownish. 



Prothorax a little narrower than the head, a little nar- 

 rowed behind, especially in the posterior half, front 

 angles rather acute, more so than the hind ones. Surface 

 very rugose, chocolate brown in color, transverse grooves 

 at front and rear deeply and broadly excavated. Ru- 

 gosities are few and broad. Meso- and metathorax shin- 

 ing black. Legs brown ; femora yellowish at the extreme 

 tip. Wings uniformly tinted with brownish ; veins a 

 little darker. 



