556 Keport of State Geologist. 



7/1^. Nasal feathers erector directed backwards, not cov- 

 ering nostrils; bill more or less curved downwards. 

 Troglodytid.k.- Wrens, Thrashers, Etc. XLVIII 

 li'-. Front of tarsus not divided into scales except at extreme lower 

 ))ortion. 



■p^. Smallhirds; length under five inches; young, 

 * not spotted. 



SvLVlIDiE. — KiNOLETS AND GnATCATCHERS. LI 



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

 distinctly spotted. 



TuRDiD.i:. Thrushes, Etc. LII 



A. Order PYGOPODES. Divers. 



Suborder PODICIPEDES. Grebes. 



I. Family PODICIPIDJE. Grebes. 



o^ Bill slender, straight, rather acute; its length rather more than twice its 

 depth at base, 

 fti. Neck much shorter than body. Colymbus. 1 



aK Bill stout, somewhat hqoked; its length not (juite twice its greatest depth. 



PODILYMBUS. 2 

 1. Gknus colymbus LiNN.iiUS. 



«'. Wing more than 6.00; bill about as long as head. Subgenus Colymbus. 



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



a^. Wing not over 6.00; bill much siiorter than head. Subgenus /))//(.<. 



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



C-. Bill depressed; wider than deep at base. 



C. nigricollis calif ornicus (Heerm.) 3 



Subgenus Colymhus. 



1. (-2.) Colymbus holboellii (Reinh.). 



Holbcell's Grebe. 



Synonym, Red-necked (Irehe. 



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. 



