556 Eepoet of State Geologist. 



m^. Nasal feathers erector directed backwards, not cov- 

 ering nostrils ; bill more or less curved downwards. 

 TkoglodytidjE. — Wrens, Thrashers, Etc. XLVIII 

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

 portion. 



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

 not spotted. 



SyLVIID^. — KiNGI/ETS AND GnATCATCHERS. LI 



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

 distinctly spotted. 



TurdidjE. — Thrushes, Etc. LII 



A. Order. PYGOPODES. Divers. 



Suborder PODICIPEDES. Grebes. 



I. Family PODICIPIDJE. Geebes. 



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

 depth at base. 

 6'. Neck much shorter than body. Colymbus. 1 



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



PctolLYMBUS. 2 

 1. Gehhs colymbus Linn^us. 



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



61. Length 18.00, or over. C. holboellii (Reinh.) 1 



a^. Wing not over 6.00; bill much shorter than head. Subgenus Dyies. 



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



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



C. uigricollis californicus (Heerm.) 3 



Subgenus Colymbus. 



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



Holboell'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 silyery-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. 



