20S Anxals of the Carnkgik Museum. 



muddy spots among the grass on the banks of the creek, where 

 the stream overflows when the water is high. 



Genus GAIXiULUS Latreille. 



209. G. oculatus Fabricius. 



Washington County. October. 



Family BELOSTOMATID^. 



Genus ZAITHA Amyot et Serville. 



210. Z. fluminea .Say. 



Jeannette. 



Genus BENACUS Stal. 



211. B. griseus .Say. 



Wihiierding, Jeannette, Pittsburgh. Under electric lights. 



Family NEPID^. 

 Genus NEPA Fabricius. 



212. N. apiculata Uhler. 



Wilmerding. 



Family NOTONECTIDi^. 



Genus XOTUNECTA Linnaeus. 



213. N. undulata Say. 



St. Vincent's College, Beatty, October 26, in the pond of a 

 brick-yard. 



214. N. irrorrata Uhler. 



Captured with the preceding species. 



Genus ANISOPS Spinola. 



215. A. platycnemis Fieber. 



Taken with N. undulata. 



Family CORISID^. 



Genus CORISA Geoffroy. 



216. C. alternata Say. 



Greensburg, October 26, 1901. Taken in fresh water. 



