APPENDIX C. — BIRDS. 325 



ttan any yet recorded. It is abundant througliout the United 

 States, where the difficulty of shooting it has passed into a proverb. 



BIRDS COLLECTED IN NEW MEXICO BY LIEUT. ABERT. 



1. Falco sparverius, L. — Sparrow-hawk. 



2. PiPiLO ABERTI, Baird. 



This species at first sight exhibits a strong resemblance to Pi- 

 pilo fusca from Monterey, from which, however, it differs in many 

 characteristic features. The colour above is of a nearly uniform 

 rusty-brown, or olive, no material difference in tint being descerni- 

 bte on the head and rump, as in P. fusca. Beneath, and on the 

 sides of the neck, the colour is much like that of the back, with a 

 stronger tinge of ferruginous, however, which becomes very decided 

 about the lower tail-coverts. The markings around the bill are 

 not very distinct, owing to the mutilated state of the specimen ; 

 there appears, however, to be a tendency to black on the loral 

 feathers ; the bristles also are black. The throat seems to be uni- 

 form in colour with the neck and breast, and unspotted. The tail 

 is uniformly coloured, and is destitute of the light tip of JP. fusca. 



The bill is much stouter than in P. fusca, as well as more curved. 

 The claws also are much stronger and larger, the tip of the outer 

 reaching to the middle of the middle one ; while in P. fusca it only 

 extends to the base. 



The general tint of plumage in P. aherti has decidedly more of 

 ferruginous than in P. fusca. The throat is uniform with the 

 breast, and unspotted ; the rump too is uniform with the back ; in 

 both these particulars differing from P. fusca. 



The following table exhibits the relative dimensions of the two 

 species : — 



P. aberti, P. fusca. (Male.) 



Length (approximate) 9 inches. 



Wing folded and slightly curved 2>{^ " Sj^g^ inches. 



Tail to base of quills 4J " 4 



Bill along the ridge = ff " U 



Greatest depth of bill ff " i§ 



Middle tail-feather beyond outer, jf " \^ 



Tarsus.... j| " \l^ 





Claw If " H " 



Rest of hind toe |g " iJ 



Middle claw || " \l 



Rest of middle toe fj " ff 





