APPENDIX 



HOLBCELL GREBE 



(2. Colymbus holboelli) 20 in. 



Brownish black above; throat and cheeks ashy gray; fore-neck 

 rufous, changing to silky gray or whitish on breast and belly. 



In winter, upper parts are lighter; chestnut and ashy of neck and 

 throat replaced by dull gray. 



TP.F. On ocean. Few authentic records for this region, 



LONG-TAILED JAEGER 



(38. Stercorarius longicaudus) 20 in. 



Similar to Parasitic Jaeger, but smaller, cap black, tail much longer. 

 Habits in every way similar. 



TF.F. On ocean. Rare. Very few records for southern California 

 coast. Nests from northern Hudson Bay to northern Greenland. 



THAYER GULL 



(51-. Larus argentatus thayeri) 22-24 in. 



A well-marked subspecies of the Herring Gull, not yet included in 

 the A.O.U. Check-List. It differs from the Herring in smaller average 

 size; slaty wing- tips, instead of black; and white wedge of basal portion 

 of second outer primary extending to and uniting with the mirror. 



California coast. Apparently irregular in occurrence, or possibly 

 mistaken for the Herring. Range not perfectly known. Nests in 

 Arctic regions of northeastern North America. 



FRANKLIN GULL 



(59. Larus franklini) 14 in. 



Adult: Head black; mantle much darker than that of the Bonaparte, 

 the common black-headed Gull with which it associates on the south- 

 ern California coast. May be distinguished in winter by darker back 

 and slaty cast on back of head and neck. 



Nests in southern Canada, east of the Rockies, and in South 

 Dakota, Minnesota, and Iowa. 



Only four records of occurrence within our limits. 



SABINE GULL 



(62. Xema sabini) 13 in. 



Adult: Head plumbeous, with clear black ring separating this from 

 white neck; mantle bluish gray. Tail distinctly forked. 



