556 EEPOBT OF STATE GEOLOGIST. 



ra 2 . Nasal feathers erector directed backwards, not cov- 

 ering nostrils ; bill more or less curved downwards. 

 TROGLODYTID.E. WRENS, THRASHERS, ETC. XLVIII 

 h 2 . Front of tarsus not divided into scales except at extreme lower 

 portion. 



p l . Small birds; length under five inches; young, 



not spotted. 



SYLVIID.E. KINGLETS AND GNATCATCHERS. LI 

 p 2 . Larger birds; length over five inches; young 

 distinctly spotted. 



TURDID.E. THRUSHES, ETC. LII 



A. ORDEK PYGOPODES. DIVERS. 

 SUBORDER PODICIPEDES. GREBES. 



I. FAMILY PODICIPID^E. GREBES. 



* 



a 1 . Bill slender, straight, rather acute; its length rather more than twice its 



depth at base. 



6 1 . Neck much shorter than body. COLYMBUS. 1 



a 2 . Bill stout, somewhat hooked; its length not quite twice its greatest depth. 



PODILYMBUS. 2 



1. GENUS COLYMBUS LINN^US. 



a 1 . Wing more than 6.00; bill about as long as head. Subgenus Colymbus. 



ft 1 . Length 18.00, or over. C. holbcellii (Reinh.) 1 



a 2 . Wing not over 6.00; bill much shorter than head. Subgenus Dytes. 



c 1 . Bill compressed ; deeper than wide at base. C. auritus Linn. 2 



c 2 . Bill depressed; wider than deep at base. 



C. nigricollis californicus (Heerm.) 3 



Subgenus COLYMBUS. 



1. (2.) Colymbus holbcellii (REINH.). 



Holbcell's Grebe. 

 Synonym, RED-NECKED GREBE. 



Adult. Front and sides of neck rich brownish-red; throat and sides 

 of head ashy, whitening where it joins the dark color of the crown, 

 the feathers slightly ruffled; top of head with slight occipital crest; 

 upper parts, generally, and wings dark brown, the feathers of the back 

 paler edged; primaries brown, part of inner quills white; lower parts 

 pale silvery-ash, the sides watered or obscurely mottled, sometimes 

 obviously speckled with dusky; bill black, more or less yellow at base; 

 eye carmine. (Wheaton.) Immature. Above, blackish; sides of head 

 with white stripes; fore part and sides of neck light rusty; otherwise 

 as in adult. 



