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543 



MONOGRAPHS OF NOBTH AMEBIOAN ItODE^tlA. 



This form of the genus nppcars to have been first noted hy Dr. Wood- 

 house in 1 853. His specimens were from EI Pnso. The known limits of its 

 distribution were enlarged in 1857 to include the regit-n of the Platte ; while 

 specimens still more recently examined show that it extends northward to the 

 Yellowstone ot least, further east in Dakota, Nebraska, and Kansas than was 

 formerly 8up|)osed, and even reaches to Arkansas, where specimens were 

 lately procured at Fort Cobb. 



Note. — The special papers in which the Saccomyida have been treated 

 will be found quoted pamm in this article; these citations constituting that 

 portion of the bibliography of the family which I have compiled. 



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