BIRDS OF NORTH AND MIDDLE AMERICA. 727 
CHATURA CINEREIVENTRIS LAWRENCEI Ridgway. 
LAWRENCE’S SWIFT. 
Similar to C. c. pheopygos, but upper tail-coverts darker (nearly 
black on outer webs) and color of under parts lighter (under parts 
of body slate color) with dusky bases to feathers of throat broader, 
more exposed. 
Adult male.—Length (skin), 105.5; wing, 104; tail, 40; exposed 
culmen, 5; tarsus, 11; middle toe, 7.4 
Adult female.—Length (skin), 108.5; wing, 106.5; tail, 42.5; ex- 
posed culmen, 4; tarsus, 10.5; middle toe, 6.5.° 
Islands of Grenada, Tobago, and Trinidad; Margarita Island, 
Venezuela. 
(2) Acanthylis oxyura (not Hirundo oxyura Vieillot) Ltoraup, Ois. Trinidad, 
1866, 84. 
Chextura cinereiventris (not of Sclater) Weis, Proc. U. S. Nat. Mus., ix, 1886, 
620 (Grenada, W. I.; habits)—Cory, Auk, v, 1888, 158 (Grenada); Birds 
West Ind., 1889, 294 (Grenada). 
[Chetura cinereiventris.] Subsp. a. Chetura guianensis Hartert, Cat. Birds Brit. 
Mus., xvi, 1892, 486, part (Grenada). 
Chetura cinereiventris guianensis Cory, Cat. West Ind. Birds, 1892, 106 (Gre- 
nada).—Cuark, Proc. Bost. Soc. N. H., xxxii, 1905, 273 (Grenada). 
Chietura] cinereiventris guianensis Hartert, Das Tierreich, Podarg., Caprim., 
Macropt., 1897, 76, part. 
Chetura lawrencet Ripeway, Proc. U. 8. Nat. Mus., xvi, no. 923, June 13, 1893, 
43 (Grenada, Lesser Antilles; coll. U. 8. Nat. Mus.). 
Clhxtura] cinereiventris lawrencei Ripeway, Proc. U. §. Nat. Mus., xvi, 1893, 44. 
Chetura cinereiventris lawrencet Ripaway, Proc. U. 8. Nat. Mus., xvi, June 13, 
1893, 43 (Grenada; Tobago; Trinid4d).—CuHapman, Bull. Am. Mus. N. H., 
vi, 1894, 58 (Trinidid).—Rosinson, Proc. U. 8. Nat. Mus., xviii, 1896, 668 
(Margarita I., Venezuela).—Hztimayr, Novit. Zool., xiii, 1906, 37 (Trinidéd; 
crit.); Verh. Orn. Gesellsch. Bayern, viii, 1908, 154 (synonymy; descr.). 
Chetura guyanensis (not C. cinereiventris guianensis Hartert) Damas, Bull. Soc. 
Zool. France, xiii, 1900, 143 (Tobago). 
[Chetura] guianensis SHarpz, Hand-list, ii, 1900, 92, part (Triniddd; ‘‘Lesser 
Antilles’’). 
(?) Chetura fumosa (not of Salvin ?) CuERRIE, Brookl. Inst. Arts and Sci., Science 
Bull., i, no. 8, 1906, 192 (Heights of Aripo, Trinid4d). 
CHATURA CINEREIVENTRIS PHZOPYGOS Helimayr. 
GRAY-RUMPED CHIMNEY SWIFT. 
Similar to ©. c. lawrencei, but upper tail-coverts clear ash gray, 
like rump, and under parts of body much darker, less strongly con- 
trasting with blackish of under tail-coverts. Similar also to C. e. 
fumosa, but rump darker and less buffy gray, the upper tail-coverts 
concolor with the rump; wing averaging shorter. 
Adults (sexes alike)—Pileum, hindneck, lores, back, scapulars, 
wings, and tail deep, slightly glossy, bluish or greenish black; rump 
@ One specimen, from Margarita Island, Venezuela. 
> One specimen (type of the subspecies) from Grenada. 
