1098 U.S. NATIONAL MUSEUM BULLETIN 23 7 part 2 



Voice. — The call notes of the Guadalupe junco are similar to those 

 of Junco oreganus. Bryant (1887) states that he heard the song only 

 twice, deli veered from the top of tall cypress trees, and that it resembled 

 the trill of the chipping sparrow. I did not hear any song approxi- 

 mating a trill, and describe the songs I heard as "wheep-whit-whit- 

 whit-wheep." Bryant (1887) also mentions that the juncos gave 

 a sharp chipping note when alarmed. No other accounts of the 

 vocalizations of insularis have been published. 



Field marks. — As insularis is strictly resident on Guadalupe Island, 

 and as no other juncos are to be found there other than accidentally, 

 there is no problem in field recognition. The Guadalupe junco has 

 a gray hood, black lores, a dark brown iris, brownish (not rufous) 

 back and flanks, no wing bars, and a white-edged tail. The long 

 bill is quite noticeable in the field and would probably serve to dis- 

 tinguish insularis from any other forms in the same genus. 



Distribution 



Range. — The Guadalupe junco is resident on Guadalupe Island, 

 Baja California. 



Egg dates. — Baja California: 3 records, March 10 to April 12. 



JUNCO GANICEPS (Woodhouse) 



Gray -headed Junco* 



PLATE 60 



Contributed by Donald M. Thatcher 



Habits 



One of the most frequently observed and relatively least known 

 avian species of the coniferous forests of the southern Rocky Moun- 

 tains and the Great Basin is the gray-headed junco. Two races are 

 recognized: the northern Junco caniceps caniceps and the southern 

 Junco caniceps dorsalis. 



According to present taxonomy the genus Junco includes 10 species, 

 4 of which are subdivided, making a total of 21 recognized forms. 

 The over-all range of these 21 forms resembles a chain, double and 

 interlocking in the West, extending from Panama and southern Baja 

 California north to Alaska and northern Canada, thence east to 

 Labrador and Newfoundland, and from there south to Georgia, 

 wherever suitable habitat occurs. From southern Arizona and north- 

 em Baja California northward and eastward, junco habitat is essen- 

 tially continuous or its "islands" not too widely separated, so the chain 



♦The following subspecies are discussed in this section: Junco caniceps caniceps 

 (Woodhouse) and /. c. dorsalis Henry. 



