1910.] NATURAL SCIENCES OF PHILADELPHIA. 409 



true position to be in Ischnoptera, we have placed it, at least provision- 

 all}', in this genus. 



ISCHNOPTERA Burmeister. 



Distribution in North America. — Extending from southwestern Maine, 

 southwestern Quebec, southeastern Ontario, Lake Superior, Minnesota 

 and Oregon, south to southern Florida, Gulf Coast, extreme southern 

 Texas, southern Arizona and California, apparently absent from the 

 Cordilleran region from Colorado north and from the greater portion 

 of the Great Basin. 



Species Groups. 



Deropeltiformis group. — General dark coloration. Supra-anal plate 

 of male more or less truncate distad. 

 Subgroup with subquadrate tegmina in female. 



1. /. deropeltiformis B runner. 



2. /. nigricollis Walker. 



Subgroup with sublobiform or lobiform tegmina in female. 



3. /. johnsoni Rehn. 



4. /. americana (Scudder). 



Pensylvanica group. — Pronotum of male always with dark discal 

 area, usually indicated in female. Supra-anal plate of male 

 with produced median portion rotundato-truncate or obtuse- 

 angulate, lateral margins of same production distinctly arcuato- 

 emareinate. 



5. /. pensylvanica (De Geer). 



5a. /. p. incequalis (Sauss. and Zehntner). 



6. /. divisa Sauss. and Zehntner. 



Uhleriana group. — General pale coloration, very rarely with disk of 

 pronotum darkened. Tegmina of female short, more or less 

 subquadrate. 



7. /. couloniana Sauss. 



8. /. uhleriana Sauss. 



8a. /. u. fulvescens Sauss. and Zehntner. 



Notha group. — General pale coloration. Supra-anal plate of male 

 broadly truncate. Tegmina of female covering greater portion 

 of abdomen. 



9. /. notha n. sp. 



