280 REVIEW OF 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; difference 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, ete. 
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 true 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. 
Smith-|Collec-| Sex When 
sonian| tor’s | and Locality. Received from Collected by 
Collected. 
No. No. | Age. 
30,278 18 jad.g| Spanishtown, Jam.| May, 1863. Wet. March. 94) 0 Po eoaae 
30,279 18 g ee “ «“ ae 
30,280 sie Q Je July, 1863, SE. diet ood dl te tates . 
26,815 He a? re July, 1862. uh oeeaane 
24,378 os 10) iy July, 1861. Sisil: andi Reese . 
a0 145 | ad.| Porto Rico. Sin Cab. Lawrence. | .ccecs 
Progne leucogaster. 
Progne leucogaster, Barr. 
Progne dominicensis, Scuater, P. Z. 8S. 1857, 201 (Vera Cruz); 1859, 
364 (Xalapa).—Scnarer & Sanviy, Ibis, 1859, 13 (Guatemala).— 
Satyv. Ibis, 1859, 466 (Belize).—Taytor, Ibis, 1860, 110 (Honduras). 
Progne chalybea, CABANIs, Jour. 1860, 402, (San Jose, Costa Rica ; July) 
(not H. chal. of Gmetin ?).—Lawrence, Ann. N. Y. Lye. 1861, 318 
(Panama R. R.).—Cassin, Pr. A. N. Se. 1860, 133 (Carthagena). 
Hab. From Southern Mexico to Isthmus of Darien, and Carthagena. (N. 
eastern South America ?) 
(No. 30,718, $4.) Upper parts glossy steel blue, as in P. subis; the quills, 
greater coverts, and tail feathers blackish, scarcely glossed, with the color of 
<>e-pey  ee ee s d l e 
