104 PACIFIC COAST AVIFAUNA No. 12 



means impossible that this species may occur upon tlie islands occasionally, the 

 above unsubstantiated record is inconclusive. 



12. Vireosylva gilva swainsoni (Baird) 



Western Warbling Vireo 



Vireosylva gilva swainsoni Dawson, Condor, xvii, 1915, p. 204. 



W. L. Dawson states that he heard one of these birds on Santa Cruz during 

 the morning of April 4, 1915. This identification is too uncertain to stand as a 

 record. 



13. Hylocichla g-uttata nanus (Audubon) 



Dwarf Hermit Thrush 



T Urdus nanus Cooper, Proc. Calif. Acad. Sci., iv, 1870, p. 78. 



Hylocichla guttata nana Richardson, Condor, x, 1908, p. 68. Linton, Condor, x, 1908, p. 



86. Linton, Condor, x, 1908, p. 129. 

 Hylocichla guttata nanus Willett, Pac. Coast Avif., 7, 1912, p. 108. 



It is with considerable hesitation that I place this subspecies in the hypo- 

 thetical list. The presence of nanus upon the islands in winter is to be expected, 

 and there are several records of its occurrence, ])ut I can learn of no definitely 

 identified specimens ever having been taken, and so must include the form con- 

 ditionally. 



TABULATION OF SPECIES BY ISLANDS 



To facilitate comparison of the avifauna of the several islands, I have pre- 

 pared the following table. Although there are many species which certainly oc- 

 cur on all the islands, though recorded from but a few, I have not taken this fact 

 into account, having marked with an asterisk (*) only those birds which have 

 been definitely reported from the several islands. 



