204 Annals of the Carnf.gie Museum. 



Family HEBRIDiE. 



Genus HKRRUS Curtis. 



178. H. americanus Uhler. 



Greensburg, July 10 to October 13. 



Family HYDROMETRID^. 

 Subfam ily HYDR OME TRIN. E. 

 Genus HYDR(3METRA Latreille. 



179. H. lineata Say. 



Pittsburgh ; Beatty. 



Subfamily VELIIN.E. 

 Genus RHAGOVELIA Mayr. 



180. R. obesa Uhler. 



North of Jeannette on the smooth waters of the creek during 

 the month of October. No winged form found. 



Subfamily GERRIN.E. 



Genus GERRIS Fabricius. 



Subgenus Hydrotrechus Stal. 



181. H. remigis Say. 



Portage, August 2, 1901. Greensburg, April, July to cold 

 weather. Pittsburgh. 



Subgenus Limnotrechus Stal. 



1 82. L. marginatus Say. 



Penn Station, April ; Beatty, Crreensburg, March 29, 1897. 



Subgenus Limnoporus Stal. 



183. L. rufoscutellatus Latreille. 



Greensburg, Penn Station. Not common. 



Genus STEPHANIA White. 



1 84. S. picta Herrich-Sch?effer. 



North of Jeannette, October 13, 1901. All without wings. 



