May, 1907 BIRDS COLLECTED ON CERROS, SAN BENITO AND NATIVIDAD IS. 



79 



Two specimens: A male and female, 







Wing 



A. 



ad. S 



396 



B. 



youngish $ 



363 



C. 



ad. $ 



406 



D. 



ad. ? 



395 



April 18. This subspecies, latel.y described bj^ Oberholser from I^lano de Yrais, 

 Lower California, appears to be a well-marked form. 



Mimus polyglottos leucopterus (Yig. ) 

 both adults, April 19. 



Thryomanes bewickii cerroensis (Anthony). Thirteen specimens, including 

 adults of both sexes, and two young, a male and a female; the adults taken March 

 27 to April 14, and the two young April 17. 



The characters that separate this form, peculiar to Cerros Island, from 7\ 

 bezvickii charienturns of the coasts of southern California and northern Lower 

 California, are well marked in this series, and the subspecies is a very good one 



Salpinctesobsoletusobsoletus (Say). Nine adults, both sexes, March '^1 to 

 April 4. 



Corvus corax clarionensis Roth. & Hart. Four specimens, both sexes, April 4 

 to April 6. From the accompanying measurements of these four skins, it would 

 seem that the raven of Cerros Island is rather nearer to C. C. ckirioiieiisis than to 

 C. corax simiatiis of southern Mexico; all skins examined in this connection, how- 

 ever, from Sonora and the western United States are nearly if not quite inter- 

 mediate and might almost as well be referred to one as the other race. The four 

 skins afford the following measurements, in millimeters: 



Tail 

 214 

 194 

 218 

 216 

 Lanius ludovicianus gambeli Ridg. Three 

 April 3 to April 21. 



Icterus cucullatus nelsoni Ridg. Two specimens, a young male April 18, 

 a female (?) April 17. 



Astragalinus psaltria hesperophilus Oberholser. Three specimens, 

 and a female, April 1 to April 6. 



Carpodacus mexicanus dementis (Mearns). Seven specimens, three adult 

 males, three adult females, and one young female in nestling plumage, March 30 

 to April 12. This form had previously been found as far south as Todos Santos 

 Island, Lower California; but it was a surprise to us to find that the Cerros Island 

 bird was wholly referable to it and so very different from C. nicg-yeg-ori of the 

 nearby San Benito Islands. 



There can be no question as to the identification of the skins. We not only 

 worked over them very carefully ourselves, but sent them to Mr. Harry C. Ober- 

 holser who compared them with a large amount of material and pronounced them 

 identical with specimens from the Santa Barbara Islands. 



Passerculus rostratus sanctorum (Ridg.). One young male, in the moult, 

 changing from the nestling to the autumnal plumage, April 21. This individual 

 may have been a straggler from San Benito Island, where Mr. Brown found the 

 bird very common. 



Amphispiza bilineata deserticola Ridg. Six specimens: four adults, both sexes, 

 and two young males in nestling plumage, March 26 to April 7. These skins are 

 like more northern ones, except in being a trifle smaller in all measurements. 



Spizella breweri Cassin. One adult male, March 30. 



Zamelodia melanocephala (Swains.). One adult female, April 12. 











Depth of 











bill at 



Tarsus 





Culmen 





nostril 



68.5 





72. 





255 



66. 





65- 





22. 



66. ■ 





70. 





23.5 



68. 





68. 





23- 



"emales. 



two adult. 



one 



young. 



and 



two males 



