280 



REVIEW OP AMERICAN BIRDS. 



[part I. 



paler streak on throat. In all stages of plumage the feathers of crissum are 

 snowy white to their roots, including the shafts. 



(No. 30,278.) Total length, 7.00; wing, 5.60; tail, 3.15; difference be- 

 tween outer and inner feather, .78 ; diflFerence between 1st and 9th primary, 

 2.88 ; length of bill from forehead, .55, from nostril, .34, along gape, .88 ; 

 width of gape, .68 ; tarsus, .55 ; middle toe and claw, .78 ; claw alone, .26 ; 

 hind toe and claw, .48 ; claw alone, .23. 



The pure white of the belly and crissum, in all stages, will readily 

 distinguish females and young of this species from those of subis, 

 in which the white is not pure, and the feathers of the crissum always 

 clouded with gray in the centres. The adult male is of course 

 readily distinguished by the snowy white belly, etc. 



In size the two birds are not materially different — the dominicensis 

 rather the smaller. The tail feathers appear disproportionately 

 narrower and more attenuated — the outer being .40 of an inch wide, 

 instead of .48. The feet, too, are disproportionately smaller, the 

 hind toe and claw especially, which measure .48, instead of .54. 



I cannot detect any difference between the Jamaica bird and a Porto 

 Rican skin in Mr. Lawrence's collection, except that the latter has 

 a patch of blackish on the outer web of the longest crissal feather. 

 I am, however, by no means sure that the Cuban and Porto Rican 

 birds, either or both, belong to the ti'ue dominicensis, of St. Domingo. 

 They are, at any rate, very different from the species of continental 

 Middle, or of South America, usually considered as identical. 



Progne leucogaster. 



Progne leucogaster, Baird. 



Progne dominicensis, Sclater, P. Z, S. 1857, 201 (Vera Cruz) ; 1859, 



364 (Xalapa). — Sclater & Salvin, Ibis, 18.39, 13 (Guatemala). — 



Salv. Ibis, 1859, 466 (Belize).— Taylor, Ibis, 1860, 110 (Honduras). 



Progne chahjbea, Cabanis, .lour. 1860, 402, (San Jose, Costa Rica ; July) 



(not //. rhal. of Gmelin?).— Lawrence, Ann. N. Y. Lye. 1861,318 



(Panania R. R.).— Cas.sin, Pr. A. N. So. 1860, 133 (Carthagena). 



Eab. From Southern Mexico to Isthmus of Darien, and Carthagena. (N. 



eastern South America ?) 



(No. 30,718, 'J, .) Upper parts glossy steel blue, as in P. subis ; the quills, 

 greater coverts, and tail feathers blackish, scarcely glossed, with the color of 



