IIO UNIVERSITY OF COLORADO STUDIES 



to omit the latter until further investigation clears up the doubt. The 

 specimens in the University collection are pileolala, some of them having 

 been identified by the United States Biological Survey. A series of 

 j uncos identified at the same time clears up some of the doubts con- 

 cerning that genus for this county. The most troublesome specimen is 

 declared a hybrid (not a true intergrade) — J. aikeni X J. mearnsi. This 

 gives us two hybrids, as the supposed species /. annectens, heretofore 

 listed, is now considered a hybrid — J. caniceps X J. mearnsi. This 

 eliminates J. annectens from the former list, but we add J. montanus, 

 so that the total remains unchanged by that omission. The juncos, 

 eliminating the two hybrid forms, for the county, now stand as follows : 



J unco aikeni. — white- winged junco. 



J unco oregonus shujeldti. — Shufeldt junco (J. h. connectens). 



Junco hyemalis. — Slate-colored junco. 



Junco montanus. — Montana junco. 



Junco mearnsi. — Pink sided junco. 



Junco caniceps. — Gray-headed junco. 



Professor Felger confirms the occurrence of the ring-necked duck 

 (Ay thy a collar is), lesser scaup duck (A. affinis), American scaup duck 

 (A. marila), and American goldeneye (Clangula americana). The 

 writer confirms the occurrence of McGillivray warbler by a specimen 

 taken above Camp Albion last September. The sora rail was found 

 dead by Professor Felger, in company with the writer, on the surface 

 of the ice near the terminal moraine of Arapahoe Glacier, last September. 



One evening during the summer of 1903 a flock of about fifteen 

 crows or ravens passed over Mapleton Hill, Boulder, just after sun- 

 down, flying barely over the housetops. The writer was unable to 

 determine the species. If they were crows (Corvus americanus) or 

 American ravens (C cor ax sinuatus), another species would be added 

 to the known Boulder County avifauna; but from the fact that the 

 range of the former in Colorado is confined chiefly to the northeastern 

 part of the state, and the range of the latter chiefly to the mountains 

 and westward, while the range of the white-necked raven (C. crypto- 

 leucus) was along the eastern base of the mountains before the species 



