PLECOPTERA OF NORTH AMERICA 97 



tion meets the recurved genital hooks of the 10th segment 

 and the dorsum of segments 6, 7, 8 and 9 lying betweer. 

 are concave and somewhat membranous and more or less 

 excavate on the apical margin of the tergum. Segment 10 

 is divided on the middorsal line and the hind angles are 

 produced upward and forward in a pair of remarkably 

 long, strong, genital hooks that are at first incurved and 

 then run parallel to their oblique, rounded spinulose an- 

 teriorily directed tips. There is a line of prickles on the 

 posterior face of each at midway its length. 



Female. The subgenital plate is marked off at the 

 sides by a groove upon the 8th sternite and is produced 

 posteriorly in a low broad triangle, rounded (and occa- 

 sionally emarginate) at the tip. 



Distribution. — 



New York, Ithaca, May 28, June 2, July 19; Mc- 

 Lean, June 9; West Falls, July 15; Mallory- 

 ville, June 20; North Fair Haven, shore of L. 

 Ontario; Gloversville, June 13, 1910 (C. P. 

 Alexander) ; Nassau, June 22 ; Clyde, July 26 ; 

 Ogdensburg, July 19, 1906 (C. Betten) ; Bing- 

 hamton, July 22; West Branch, Ausable R., 

 Essex Co., July 1, 1923 (P. W. Claassen). 



Maryland, Plummers Island, June 19 (M. V. 

 Warner) ; Laurel, July 23 (E. B. Marshall). 



Massachusetts, Springfield (G. Dimmock). 



Pennsylvania, Harrisburg, July 6. 



Minnesota, Minnehaha, June 7. 



Canada, Quebec. 



Nova Scotia, Truro, June 2, June 24, July 17 

 (R. Matheson) . 



Indiana, Elkhart, June 18. 



Illinois, Ottawa, July 2 (W. E. Howard). 



Michigan, Ann Arbor, June 27. 



Kansas, Riley Co., June 22, Popenoe. 



Mississippi, Agricultural College, H. E. Weed. 



Tennessee, Knoxville, June 24. 



North Carolina. 



Perla luctuosa Banks. 



(Plate 12, fig. 8; plate IS, figs. 16-19.) 



1906. Perla luctuosa Banks, Can. Ent., 38:336. 



1907. Perla luctuosa Banks, Cat. Neurop., p. 12. 



Length to wing tips, male, 17 mm.; female, 21 mm.; 

 expanse, male, 29 mm. ; female, 34 mm. 



