178 THOMAS SAY FOUNDATION 



13. Size large. Expanse of wings 30-50 mm. Fe- 



male subgenital plate produced over half of seg- 

 ment 9, the hind margin slightly angulate and 

 usually bearing at the apex a squarish shiny 



spot pacifica 



Size smaller. Expanse of wings 18-30 mm. Fe- 

 male subgenital plate produced over two-thirds 

 of 9, the margin evenly rounded and not bearing 

 at the apex a shiny spot . jrumila 



14. Female subgenital plate much produced, either 



bilobed or bearing a declivitous projection. Male 

 genital hooks cylindrical, segments 9 and 10 



above with short spines 15 



Female subgenital plate not much produced, hind 

 margin more or less evenly rounded. Male geni- 

 tal hooks flattened, triangular 16 



15. Female subgenital plate narrow at base and at 



the apex two-lobed. Male genital hooks cylin- 

 drical, slender and usually outcurved, hammer 



small, somewhat circular arida 



Female subgenital plate with a declivitous pro- 

 jection whose hind margin is entire. Male geni- 

 tal hooks more broadly cylindrical and usually 



straight, hammer large, transversely oval 



ez 'oluta 



16. Female subgenital plate somewhat produced, 



evenly rounded and bearing before the apex a 

 transverse narrow tubercle. Male genital hooks 

 flat, broadly triangular, hammer transversely 

 oval, segments 9 and 10 above without short 



spines ruralis 



Female subgenital plate somewhat produced, the 

 hind margin slightly angulate, no tubercle be- 

 fore the apex. Male genital hooks flat, narrow- 

 ly triangular, hammer transversely oval, seg- 

 ments 9 and 10 above with short spines 



pennsyh'anica 



Acroneuria abnormis Newm. 



(Plate in, fig. 1; plate 28, figs. 3, 4; plate 30, fig. 12.) 



1838. Perla abnormis Newman. Ent. Mag. 5:177. 



1842. Acroneuria abnormis Pietet, Ins. Neurop. (Perlides), 180. 



1852. Perla abnormis Walker. Cat.. 147. 



1861. Perla abnormis Hagen, Syn. Neur. X. Am., 17. 



1873. Perla abnormis Hagen, Geol. and Geog. Sur. Col., 574. 



1892. Acroneuria abnormis Banks, Cat., 341. 



1894. Acroneuria abnormis Banks, Ent. News, 5:178. 



