NATURAL SCIENCES OF PHILADELPHIA. 107 



whitish, tinged with very dilute tawny yellow ; across the upper part of the 

 breast is a tawny colored band, spotted with brown ; upper mandible black- 

 ish brown, the lower yellowish with the tip dusky ; irides brown ; tarsi and 

 toes pale yellow. 



Length (fresh measure) 4| in. ; wing 2_5 g ; tail If ; bill | ; tarsi f. 



Habitat. The Savannah near Panama City. 



The female is smaller and has the margins of the feathers above more ru- 

 fous and distinct ; the hue of the under surface much more tawny, especially 

 the sides which are conspicuously spotted, as well as the breast ; the outer 

 tail feathers are of a light fawn color. 



Length (fresh) 4 in. ; wing 2^ ; tail If; bill J>^'; tarsi |I. 



I determined this species to be A. rufus from specimens in the Phil. Acad.; 

 these being mounted, the comparison could not be made satisfactorily, except 

 as regards general appearance, in which they are much alike. The Panama 

 species, however, is smaller, the lengths of the two sexes taken from fresh 

 specimens, are respectively 4| and 4^ inches, the dried skins measuring half 

 an inch less. Since my first determination of it, I have received specimens of 

 A. rufus (as I suppose them to be) from Bahia, Brazil; these now measure 5\ 

 in., and probably the length of recent specimens would be fully 6 inches. 



The under plumage of the Brazil species is more decidedly yellow ; and in 

 several specimens there are none resembling the female of the other species, 

 in its tawny under plumage. The Brazil bird has the outer tail feather white, 

 with the margin of the inner web broadly brown nearly to the end; the next 

 feather is brown, with a wedge shaped white stripe in the centre, terminating 

 half way from the end. 



Birds from the two localities are certainly different, though I may err in 

 calling ihose from Brazil, A- rufus. However, as it differs in its diminutive 

 size, together with some other characters from all described species, I have no 

 hesitation in deciding that it is new. 



Prof. Baird (Kev. Am. Birds, p. 157) considers its nearest ally to be Neo- 

 corys Spraguei, which species I state that it resembles in habits, in my first 

 account of it. Prof. Baird proposes for it a new subgenus, viz. Notiocorys. 

 He also expresses a doubt of my identification of it as A. rufus being correct. 



3. Thamnophilus nigricristatits. 



Male. Crown deep black, on the front a few feathers are narrowly pencil- 

 led with white ; upper plumage black, regularly banded with lines of white ; 

 the feathers of the throat and the sides of the head have black centres, with 

 their outer edges white ; tail black, all the feathers marked on the margins 

 of both webs With roundish white spots, six on each side ; quills black, the 

 outer webs marked with white spots of a quadrate form ; wing coverts black, 

 all terminating in white ; the feathers of the under plumage marked with al- 

 ternate bars of greyish white and black ; upper mandible black, the lower 

 plumbeous, paler at the end ; irides yellow ; feet black. 



Length (fresh) 6 in. ; wing 2| ; tail 2 ; bill 1 1 ; tarsi 1. 



Habitat. Line of Pan. R. R., Lion Hill Station. 



Female. Crown dark cinnamon, the feathers of the hind neck and sides of 

 the head pale cinnamon, with black centres ; wing coverts and outer margins 

 of quills and back bright cinnamon ; tail dark cinnamon ; inner webs and ends 

 of the quill feathers blackish brown ; throat grey with a slight cinnamon 

 tinge, under plumage clear cinnamon, much paler than the back; the mid- 

 dle of the abdomen whitish ; under lining of wings pale cinnamon; inner 

 margins of quills of a light salmon color ; bill and feet as in the male. 



This species differs from doliatus and affinis in having no white in the crest; 

 doliatus is darker below, the black bands being nearer together ; it also differs 

 from affinis in having the white markings above smaller and more distinct ; in 

 that species they are more linear in form ; the female of the new species is very 

 different from that of affinis, being much brighter and clearer in color ; it is 



1865.] 



