PLECOPTERA OF NORTH AMERICA 141 



median groove. There are faint touches of orange at the 

 front angles and farther back upon the side margins, and 

 sometimes also in the midst of the black each side of the 

 disc. Embossed markings subobsolete. Legs yellowish 

 at the sides and across the apex of the femora, elsewhere 

 brown, darkening on the tarsi. Coxae and trochanters 

 yellow. Wings hyaline, with a faint suggestion of yellow- 

 ish in the costal space and with very heavy black veins. 

 A large closed cell occupies about half the space between 

 veins R and M beyond the cord. 



Abdomen blackish above except for the apices of the 9th 

 and 10th segments which are yellow. There are also nar- 

 rowed yellow lines on lateral and apical carinae of some 

 of the preceding segments. Tails blackish, thinly clad 

 with short yellowish pubescence. 



Male, unknown. 



Female. Subgenital plate very low and broad, about as 

 wide as the abdomen, extended beneath half or more of 

 segment 9, and broadly rounded on its free border, with 

 a black spot each side at its base. Segments 9 and 10 yel- 

 low beneath with a conspicuous round black spot at each 

 side. 



Distribution. — Black Rock, Clinton Co., N. Y., June 21, 

 1910 (C. R. Crosby) ; Quebec (Geo. Maheux). 



Holotype female in Cornell University Collection. 



Clioperla ebria Hagen. 



(Plate 25, figs. 1, 2, 3.) 

 1875. Perla ebria Hagen, Bull. Geol. Surv. Terr., p. 577. 

 1907. Isoperla ebria Banks, Cat. Neurop., p. 13. 



Length to wing tips, male, 12-14 mm.; female, 15-17 

 mm. Expanse, male, 20-24 mm. ; female, 25-29 mm. 



Color brownish varied with yellow. Head brown in the 

 middle above and on the hind angles at the sides behind 

 the eyes ; three yellowish spots in area between the eyes, 

 one the crown spot between the ocelli, the others outside 

 the lateral ocelli ; three pale spots across the frons, one be- 

 fore the median ocellus, the others (more whitish) just 

 within the bases of the antennae. Palpi and antennae 

 pale brown, the latter darker on the stout basal segment. 

 The antennal carinae and the crest of the frontal tubercle 

 finely margined with black. 



Prothorax with a broad yellow median band distinctly 

 widened at both ends, traversed by a median brown im- 

 pressed line that joins similar cross lines at its ends to 

 make a toppled H-shaped figure. Sculpturings of the disc 



