THE NAUTILUS. 117 



181. STROBILOPS VIRGO (Pils.). Canada to Northern Alabama 

 and west to Minnesota and Kansas. 



182. STROBILOPS AFFINIS Pils. New York, Ohio, etc. 



183. STROBILOPS HUBBARDI (Brown). Calhouu Co., Texas; 

 Savannah, Ga. ; Eastern and Northern Florida. Also Jamaica. 



Genus LEUCOCHEILA Martens. 



184. LEUCOCHEILA FALLAX (Say). Prov. Ontario, Canada, to 

 Florida, and west to Minnesota, Texas and Arizona. 



185. LEUCOCHEILA MODICA (Old.). St. Simon's Island, Ga. to 

 Florida ; west to Cedar Keys and Ala. 



Genus BIFIDARIA Sterki, 1891. 



Section Albinula Sterki. 



186. BIFIDARIA ARMIFERA Say. Ontario and Quebec, Canada, 

 and nearly the whole U. S. east of the Rocky Mts. 



187. BIFIDARIA CONTRACTA Say. Ontario, Canada, and the 

 whole U. S. east of the Rocky Mts. ; eastern Mexico. 



188. BIFIDARIA HOLZINGERI Sterki. St. Cloud, Minn., Iowa, 

 S. to AVichita, Kansas and Juliet, Will Co., 111. 



188a. BIFIDARIA HOLZINGERI FORDIANA Sterki. Wichita, 

 Kansas. 



Section Bifidaria s. str. 



189. BIFIDARIA HORDEACEA Gabb. Arizona, New Mexico. 



190. BIFIDARIA PROCERA Gld. Minnesota to New Mexico, and 

 eastward. 



191. BIFIDARIA HORDEACELLA Pils. Comal and Lee Counties, 

 Texas ; New Mexico. 



192. BIFIDARIA RUPICOLA Say. Kansas and New York south- 

 ward to Texas and Key West, Florida. 



193. BIFIDARIA SERVILIS Gld. Florida ; Cuba. 



(An undescribed form of this group has been called P. riogrand- 

 ensis Sterki. Hidalgo, Texas). 



194. BIFIDARIA CORTICARIA (Say). Ontario and Maine to 

 Minnesota, south to South Carolina and Mississippi. 



195. BIFIDARIA HEBES Ancey. New Mexico, Arizona, Nevada 

 and Utah ; type locality White Pine, Nevada. This is P. arizonensis 

 W. G. B., not Gabb, and P. gabbi Dall. A form saxicola 1 Ckll. has 



1 Not Pupa saxicola Lowe nor P. saxicola Moq.-Tand. 



