PLECOPTEKA OF NORTH AMERICA 37 



ish middorsal band on prothoracic disc, widened toward 

 its ends. 



Prothorax slightly broadened posteriorly, with straight 

 sides, end convex margins, especially in the rear, and 

 acute angles. 



Male. Ninth ventral abdominal segment prolonged 

 rearward, covering and extending far beyond the 10th 

 sternite and ending in a notch the bordering lobes of 

 which in lateral view are sharply decurved at tips. Ap- 

 pendage-like lobes of the divided 10th tergite a little 

 shorter and slenderer than in P. dorsata, somewhat con- 

 tracted before the apex and not sharply upcurved at tips. 

 Supra-anal plate developed as a sperm conveyor, un- 

 branched, and bearing a terminal sperm cup. 



Female. Subgenital plate not separate from the ster- 

 nite, apical margin very slightly produced and with a 

 median rectangular notch in its margin. 



Distribution. — Canada to Georgia, west to Kansas and 

 Minnesota. 



This species is very close to the preceding and only a 

 careful examination of the genitalia will distinguish the 

 males. It is less common than the preceding specie?, but 

 if a specimen in the U. S. National Museum (a small male 

 ticketed "Coquillett; Los Angeles, Calif.") is correctly 

 labelled as to locality, it has a wider range. In the Eastern 

 U. S. it flies during June and July. 



Pteronarcys calif ornica Newport. 



(Plate 7, figs. 5, 6.) 

 1851. Pteronarcys calif 'ornica Newport, Trans. Linn. Soc. Lond., 



20:450. 

 1873. Pteronarcys calif ornica Hagen, Proc. Bost. Soc. Nat. Hist., 



5:284 (nymph). 

 1883. Pteronarcys calif ornica Packard, 30th Rept. IT. S. Ent. Com., 



pi. 39, fig. 8 ; 40, fig. 6 ; 44, figs. 1, 9. 

 1917. Pteronarcys calif ornica Smith, Trans. Amer. Ent. Soc, 43:449 



(contains full bibliography, 8 titles). 



Male. Length to wing tips 33-40 mm.; expanse of 

 wings 58-66 mm. 



Female. Length to wing tips 41-46 mm. ; expanse of 

 wings 72-84 mm. 



Color dark brown, paler beneath. Head blackish, supra- 

 antennal plate ends in a sharp erect tooth. Median line 

 on disc of prothorax obscurely reddish, widened toward 

 its ends. Legs dark brown. Wings with blackish veins. 

 Tails brown in middle, paler toward both ends. Pronotum 

 nearly as long as broad, its front and sides straight, its 

 hind margin convex, its angles obtuse. 



