PLECOPTERA OF XORTH AMERICA 99 



color extending from the middle ocellus to the antennae 

 and reappearing on the sides of the head behind the eye. 

 Ocelli very large and close set, the hind ones twice the size 

 of the median, and separated from each other by little 

 more than the diameter of one of them ; twice as far re- 

 moved from the eye. Antennae yellowish beyond the yel- 

 lowish brown basal segment. Palpi yellowish. 



Prothorax a little wider than long, sides contracted on 

 the posterior third, front margin convex, hind margin 

 straight or hardly rounded, the angles are sharp ; disc 

 nearly smooth ; middorsal yellow stripe is narrowed in the 

 middle. Meso- and metathorax yellowish brown. Legs 

 yellowish with a narrow dark band crossing the tip of the 

 femora. Tarsi darker toward the tip. Wings uniformly 

 subhyaline with pale brown veins. The second anal vein 

 of the hind wing is remarkable for the number of its 

 branches, all pectinately arranged on the posterior side. 



Abdomen yellowish brown, tails brown. The basal seg- 

 ment is longer than wide, and succeeding segments 2, 3 

 and 4 are wider than long. 



Male unknown. 



Female. Ventral plate produced over at least one-half 

 of the 9th sternite, broadly rounded, very slightly emargi- 

 nate in the middle. On the ventral margin of the 9th ster- 

 nite each side there is a transverse, elongate triangular 

 area closely covered with short, spiny hairs that bend 

 forward. 



Holotype, female, Ithaca, N. Y. (Cornell University Col- 

 lection.) 



Perla kansensis Banks. 



(Plate 19, figs. 11, 12.) 

 1905. Perla kansensis Banks, Psyche, 11:56. 



Length to wing tips, male, 21 mm. ; female, 22 mm. Ex- 

 panse, male, 34 mm. ; female, 36 mm. 



Color yellowish brown, head concolorous above except 

 for the rings of black pigment bordering the ocelli in- 

 ternally and ocelli and eyes about equidistant. Antennae 

 and palpi brownish. 



Prothorax wider than long, greatly narrowed to rear, 

 ward with broadly rounded hind angles, straightish be- 

 tween them, the front margin strongly convex. Surface 

 of the sides of the disc slightly rugose. Meso- and meta- 

 thorax brownish, legs brown. Femora with a narrow dark 

 band at the tip. Tibiae broader than usual, inner edges 

 somewhat swollen, tarsi brown. Wings pale yellowish, the 

 venation only slightly darker. 



