508 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



CoKiscus, Schrauk. 



33. Coriscus suhcoleoptratus. 



Nabicula suhcolcoptrata, Kirby, Fauna Bor.-Amer. vol. iv, p. 282. 

 Nubis suhcoleoptratus, Eeuter, Ofversigt Vetensk. Akad. Forhandl. 1872, p. 81, 

 No. 1. 



. From Pembina, July ; from Turtle Mount, July 24 ; and from Milk 

 Eiver region. 



34:. Coriscus ferus. 



Cimex ferus, Linn. Fauna Suecicse, p. 256, No. 962. 

 NaMs ferus, Fieb. Eur. H6mipt. j). 161, No. 9. 



Inhabits Pembina; was collected June 19; near Mouse Eiver, August 

 29 ; and Milk Eiver region. 



Subfamily EEDUVIINA. 



SiNEA, Amyot & Serv. ' 



35. Sinea diadema. 



Beduvius diadema, Fab. Gen. Ins. p. 302 ; Ent. Syst. iv, p. 206, No. 46. 

 Sinea multispinosa, Amyot & Serv. HcSmipt. p. 375, No. 1. 



Obtained at Pembina and at Turtle Mount, July 24. It is distributed 

 over a large part of North America, from Mexico into Canada, and 

 throughout the Atlantic region. 



Subfamily APIOMEEINA. 



Apiomerus, Hahn. 



36. Apiomerus ventralis. 



Beduvius ventralis, Say, Heteropt. p. 31, No. 2. 

 One specimen from the vicinity of Pembina. 



HYGROMETRID^. 



LiMNOTRECHUS, St&l. 



37. Limnotrechus marginatus. 



Gerris marginatus, Say, Heteropt. p. 36, No. 2. 



Inhabits the Milk Eiver region, and is quite common in the Atlantic 

 district in most of its areas. 



LlMNOPORUS, Stai. 



38. Limnoporus rufoscutellatus. 



Gerris rufoscutellata, Lat. Gen. Ins. iii, p. 134, No. 2.— Schummel, Ploteres, tab. 

 3, figs. 1,2. 



Occurs at Pembina, on the pools and ponds. 



