78 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Thryomanes bczvicki nesophilus Oberholser 



Type locality — Santa Cruz Island, California. 



Range — Santa Cruz and Santa Rosa islands, California. 



Specimens examined from the following locality: Santa 

 Cruz Island, 19 (14 adults, 5 juvenals). 



Distinguishing characters — Most nearly like T. b. charien- 

 turns of the adjacent mainland, from which it is but slightly 

 differentiated. In coloration the dorsal surface and flanks are 

 of a somewhat darker brown than is the mode in the mainland 

 form. Tail usually shorter than wing; in just one of the adults 

 at hand is it the reverse. In charientiirns the tail is generally 

 longer than the wing. 



Remarks — The Santa Cruz Wren is apparently one of the 

 most illy defined of any of the described forms of Thryomanes 

 bewicki. The available series affords satisfactory material for 

 comparison, containing four September specimens in newly 

 acquired winter plumage, others taken in early spring, before 

 becoming excessively worn, and some juvenals. Judging from 

 these specimens this island form has become but slightly dif- 

 ferentiated from the mainland race. I am able to appreciate 

 the average slightly darker coloration of upper surface and 

 flanks, but it is covered in the range of variation shown by 

 mainland charienturus, occasional individuals of the latter be- 

 ing quite as dark. 



The difference in proportions is perhaps the most tangible 

 character, for the proportionately shorter tail of nesophilus is 

 evident upon measurement. It is perhaps notev/orthy that the 

 slight differences serving to distinguish nesophilus from chari- 

 enturus are steps in the direction of spilurus, the slightly more 

 reddish dorsal coloration, darker flanks, and shorter tail, be- 

 ing just the characteristics encountered in birds occupying the 

 intermediate coastal region between the ranges of charienturus 

 and spilurus. The mainland nearest to Santa Cruz Island 

 forms part of this intermediate region. 



Thryomanes bciincki catalincu Grinnell 



Type locality — Avalon, Santa Catalina Island, California. 

 Range — Santa Catalina Island, California. 



