STELGIDOPTERYX. 



317 



the faintly rufous throat, contrasting, not uniform, with the mouse 

 brown of the breast ; this brown only extends over the front of the 

 breast, instead of reaching to the belly, which is faintly yellowish, 

 not dull white. The crissum is quite the same in both. Young 

 birds of the two species are so similar that I cannot distinguish 

 them by the color. 



The species agrees with ruficollis, and differs from iiropijgialis, 

 in the want of contrast of a pale rump and dark back. The size 

 is decidedly less. It differs from both in much paler fulvous of 

 throat, less amount of sulphur yellow on the belly, and the want 

 of the dusky brown tips of the longer of the under tail coverts. 



(35,096.) "Compared with type." 



Stelgidopteryx iiropygialis. 



Cotyle mopygialis, Lawr. Ibis, April, 1863, 181. — Ib. Anu. N. Y. Lye. 



(Panama). 

 Cotyle flavigastra (Vieill.), Sclater, P. Z. S. 1860, 274 (Babahoyo, 



Ecuador).— Co^^?e ruficollis (Vieill.), Sclatek, P. Z. S. 1860, 292 



(Esmeraldas, Ecuador). 



Hab. Istlimus Panama ; southward along Andes. 



(No. 157, % , type.) This species, if really distinct from ruficollis, resembles 

 it very closely in most respects. It is, however, smaller, and the rump de- 

 cidedly lighter, or pale grayish, in prominent contrast to the brown of the back. 

 The rufous of the throat seems rather deeper, and the inside of wings darker. 



A specimen (17,792) differs in having the wings longer and more pointed, 

 measuring 4.45, the extreme difference between tips of primaries 2.15, the 

 tail 2.30. It may, however, be that the wing of the type is not fully grown. 



(No. 157.) Total length, 5.10 ; wing, 4.15 ; tail, 2.40, fork, .18 ; difference 

 of primaries, 1.96 ; length of bill from forehead, .41, from nostril, .20, along 

 gape, .55, width, .40 ; tarsus, .39 ; middle toe and claw, .52, claw alone, .18 ; 

 hind toe and claw, .35, claw alone, .14. 



(157.) Type. 



