PLECOPTERA OF NORTH AMERICA 8.5 



Male. Abdominal segments normal to the 6th, though 

 the apical border of the 6th sternite is bordered with yel- 

 lowish. Segment 7 slightly enlarged, the edges of the 

 sternite produced in a yellow scurfy pubescent scoop-like 

 border. Segment 8 similarly less produced. Segment 9 

 somewhat narrower, its sternite slightly produced, up- 

 turned and angulate in the rear, its entire rear margin 

 yellowish. Segment 10 yellowish, cleft on the middorsal 

 line, the rear angles beside the cleft produced obliquely 

 to rearward in a pair of elongate triangular obtuse-tipped 

 hairy lobes that lie nearly flat, and are not recurved at all 

 to form genital hooks. Upturned tip of the U-shaped 

 supra-anal process cylindric, very obtusely pointed, and 

 bearing a pair of brown strongly chitinized claw-like 

 lateral stylets near its middle. 



Female. Abdominal segments 9 and 10 are yellow- 

 ish and both are covered beneath by the subgenital plate 

 of the 8th sternite which is produced rearward in a very 

 broad scoop in the middle of whose hind border is a 

 wide, shallow, rounded notch. 



Distribution.— N. C. in May; White Mts., N. H. ; Glen 

 House, N. H. June 13 (C. W. Johnson) ; Camp Kennedy, 

 Mt. Katahdin, Me., 3,000 ft., Aug. 1902; Old Forge, N. Y., 

 Aug. 20, 1905 (J. G. Needham) ; Summit of Mt. Grey- 

 lock, Mass., June 15 and June 11, 1906; Axton, N. Y., June 

 12-20, 1901 (A. D. MacGillivray and C. O. Houghton) ; 

 Woodworth's Lake, June 23, 1910 (C. P. Alexander) ; Eas- 

 ton, N. Y., May 25, 1923 (M. D. Leonard) ; Ringwood 

 Hollow, near Ellis, N. Y., May 21, 1922 (C. F. Wu). 



Perla fugitans, new species. 



(Plate 12, fig. 7; plate 17, figs. 13, 14.) 



Length to wing tips, male, 15 mm. ; expanse 28 mm. 



Color brown varied with yellow. Head brownish above 

 with a wide occipital band reaching nearly to the brown 

 hind angles, with a median yellow extension forward to 

 the middle of the ocellar triangle, constructed on the epi- 

 cranial suture. Antennae and palpi dull brownish. 



Prothorax quadrangular with straight and parallel 

 sides and rather sharp angles ; obscure rugosities upon 

 the sides of the disc bordering the usual pale yellowish 

 median line. This line is narrowed before the middle of 

 the disc and widened again to rearward, and extended on 

 to the middle of the mesothorax, very narrow in front but 

 widened regularly backward on that segment. Legs 

 brownish. Wings subhyaline with strong brown veins. 



