556 REPORT OF STATE GEOLOGIST. 



m 2 . Nasal feathers erect or directed backwards, not cov- 

 ering nostrils; bill more or less curved downwards. 

 TROGLODYTID^E. WRENS, THRASHERS, ETC. XLVIII 

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

 portion. 



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



not spotted. 



SYLVIIDJE. KINGLETS AND GNATCATCHERS. LI 

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

 distinctly spotted. 



. THRUSHES, ETC. LII 



A. ORDER PYGOPODES. DIVERS. 



SUBORDER PODICIPEDES. GREBES. 



I. FAMILY PODICIPIDJE. GREBES. 



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



depth at base. 



ft 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. 



b l . 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. 



