4S0 Descriptions of New Species of American Birds. 



ciable one of brownish ; the white speculum is smaller, the 

 cinnamon color is more extended on the rump." 



Remarks. — Since the above was written many specimens 

 have been received at the Smith. Inst., most of them have the 

 back entirely olivaceous, without any mixture of black. These 

 I consider to be not fully mature; in all other respects, how- 

 ever, they agree with the type. As stated by Prof. Baird S. 

 torqueola has the back of a uniform black down to the cinna- 

 mon color on the rump, without any olivaceous color interven- 

 ing as it does in the new species. 



18. Pyrgisocna xantusii, Baird, MS. 



" Male. Top of bead and its sides behind the ear coverts, with 

 the nape chestnut ; rest of upper parts including wing and tail, 

 forehead, cheeks and sides of body dark dull olive ; beneath, from 

 bill to anus, white ; flanks behind and under tail coverts light cin- 

 namon brown ; edge of wing, ring round the eye and a loral spot, 

 white ; a somewhat concealed spot in the middle of the breast 

 dark ashy olive ; bill black ; feet light brown. 



" There is scarcely any appreciable edging of lighter to the quills 

 and tail-feathers ; the olive of the forehead is not abruptly defined, 

 but passes gradually into the chestnut or dark cinnamon of the 

 top of the head ; there is a tinge of ashy on the sides of the neck 

 and breast ; the feathers of the upper part of the breast which 

 produce the spot, are of a dark plumbeous olive, on their whole 

 outer webs, and white on the inner. 



"Length 7.25 ; wing 3.25 ; tail 3.15 ; bill above, .63 ; from nostril, 

 .43 ; tarsus .96. 



" Habitat. — Western Mexico, Plains of Colima. Collected by 

 John Xantus, June, 1S63. No. of type, 31,828. 



"This species is very similar in size and appearance to P. 

 biarcuatu/Ji, but lacks the white crescent on the side of the 

 neck, and the black forehead, and has the cheeks olive not 

 white : the dark spot on the throat is not found in liarcuatum. 



