PLECOPTERA OF NORTH AMERICA 139 



ringed with yellow that is confluent with the dorsal 

 stripe. Hind angles of head black externally, the M-mark 

 across the frons is polished, slender, and near its outer 

 end are the minute roundish frontal tubercles. Antennae 

 and palpi brown. 



Prothorax one-half wider than long, quadrangular with 

 wide submarginal grooves across both front and rear. 

 Color brown, with a wide and conspicuous parallel sided 

 median yellow stripe. There is a faint continuation of 

 this stripe on the front of the mesothorax. Embossed 

 markings of sides of the prothoracic disc are rather fine 

 vermiculate, polished brown. The angles have a faint sug- 

 gestion of yellow color. Legs brown beyond the yellow 

 short basal segments except for a conspicuous yellow knee 

 cap, covering an eighth of the tips of the femora. Wings 

 subhyaline with strong brown veins. 



Abdomen blackish, genital parts and environs yellow- 

 ish. Tails brown, paler at base. 



Male. Abdominal segments normal to the 8th, which 

 is very slightly modified on the ventral side, a crescentic 

 apical area being yellowish and somewhat delimited bas- 

 ally by a shallow groove. The ninth segment is prolonged 

 ventrally into a low broad subgenital scoop with the usual 

 upcurvature of the apex. The tenth segment is inclosed 

 in the ninth below, entire above, and broadly convex 

 in the middle. Genital hooks spring from the subanal 

 lobes, short, recurved and clawlike. 



One male specimen from Olympia, Wash., June, 1898 

 (Cornell University Collection). 



Clioperla clio Newman. 



(Plate 12, fig. 3; plate 25, figs. 4, 5, 6.) 



1833. Isogenus clio Newman, Mag. Nat. Hist., 3:86. 



1852. Isogenus clio Walker, Cat. Neur. Ins., p. 146. 



1861. Perla clio Hagen, Syn. Neur. N. A., p. 19. 



1863. Perla clio Hagen, Stett. Ent. Zeit., 24:371. 



1907. Isogenus clio Banks, Cat. Neurop., p. 11. 



1912. Isogenus clio Klap., Coll. Selys, 4:60. 



Length of male to wing tips, 17 mm., expanse, 28 mm. 



Length of female to wing tips, 20 mm.; expanse, 34 

 mm. ; antennae, 10 mm. 



Color fuscous varied with yellow. Head yellow above 

 with a big blackish short-armed X-mark on the crown, 

 the crossing of the X between the ocelli, the projecting 

 arms short, especially rearward, the forward arms ex- 

 tending toward the bases of the antenna. A heavy yel- 

 low V-mark in front of the middle ocellus, the V opening 



