PETROCHELIDON. 459 
white. Hab. Whole of temperate North America; south, in winter, 
into Mexico (as far as Guanajuato, Tepic, Mazatlan, etc.). 
(77) 611. P. subis (Linny.). Purple Martin. 
6%. Smaller, with narrower tail-feathers, and, relatively, more deeply forked 
tail. Adult male with feathers of ventral region marked, beneath sur- 
face, with a broad spot, or bar, of white. Adult female and immature male 
with whole under portion and sides of head and neck, chest, sides, and 
flanks, uniform sooty grayish brown, in marked contrast with pure 
white of belly, anal region, and under tail-coverts. Length about 7.60, 
wing 5.35-5.60, tail 2.90-3.25 (forked for .65-.90). Hab. Cuba and 
southern Florida; Honduras? 
611.1. P. cryptoleuca Barrp. Cuban Martin? 
a’, Adult males with anterior and lateral lower parts smoky grayish brown (the 
feathers with more or less distinctly paler tips), the belly, anal region, and 
lower tail-coverts white; adult females similar to adult males, but upper 
parts less glossy, the forehead always (sometimes whole top of head) dull 
dark smoky grayish brown. 
Adult male with upper parts uniform glossy blue-black, or dark violaceous 
steel-blue (rather less violaceous than in P. subis and P. cryptoleuca) ; 
length (skin) about 6.30-7.00, wing 5.10-5.40, tail 2.65-2.90. Hab. 
Southern Mexico (north to Vera Cruz), Central America, and northern 
South America, south to Tobago, Guiana, and western Ecuador. 
P. chalybea GmreL. Gray-breasted Martin? 
Genus PETROCHELIDON Cazanis. (Page 457, pl. CXIV,, fig. 3.) 
Species. 
Common CHaracters.—Adulis: Forehead white, pale brownish, or chestnut; 
top of head uniform glossy blue-black; hind-neck brownish gray, with more or less 
of chestnut on upper portion; back and scapulars glossy blue-black, the first 
streaked, more or less, with white; rump cinnamon or cinnamon-buff; upper tail- 
coverts grayish brown, margined with paler; wings and tail plain dusky; lores 
black; rest of head (except as described above), including chin and throat, rich 
chestnut or light cinnamon; sides and flanks (sometimes chest also) grayish 
brown, more or less tinged with cinnamon; longer under tail-coverts grayish 
dusky, bordered with white. Young: Essentially like adults, but colors much 
duller, with pattern less sharply defined. est a gourd- or retort-shaped structure 
composed of pellets of mud, mixed with a few straws and lined with soft feathers, 
1 Progne eryptoleuca Barrp, Review Am. B. i. May, 1865, 277. 
Six Cuban and two Floridan specimens of this well-marked species are before me. The adult females and 
immature males (of which there are four from Cuba and two from Florida in the National Museum collection— 
the latter from Cape Florida and Clearwater) are exceedingly distinct in plumage from those of P. subie. In 
fact, they resemble so closely the corresponding plumages of P. dominicensis Gun. that I am unable to state 
how they can be distinguished. P. dominicensis has not yet been taken, however, in Cuba. 
2 Hirundo chalybea Guat., S. N. i. 1788, 1026, Progne chalybea Bors, Isis, 1844, 178, 
