616 



BULLETIN UNITED STATES GEOLOGICAL 6UEVEY. 



chauge probably does not take place macb, if any, east of tbe Eocky 

 Mountains. Pure villosus occurs on the Missouri at Fort Eaudall. 



List of specimens. 



PICUS YILLOSUS HARRISI, {And.) Coues. 

 Harris's Woodpecker. 

 Found only in the Eocky Mountains. 



List of specimens. 



SPHYEAPICUS VARIUS, {Linn.) Bd. 



Yellow-bellied Woodpecker, 



Plentiful at Pembina, where it was breeding with the Eedheads in 

 June, and again seen on the Mouse Eiver j not observed further west, 

 nor anywhere ia the Missouri country, — though we are not to infer that 

 it is actually absent from that region. In these high latitudes (and 

 further north — for it goes to 61° at least), it is probably only a summer 

 resident. It seems to be more decidedly migratory than most of our 

 Woodpeckers, and penetrates in winter to Central America. This may 

 be partly, at least, due to the peculiarity of its food, for it feeds largely 

 upon living cambium, and may not be able to secure this to its taste 

 when the sap ceases to flow. 



List of specimens. 



