BIKDS OF NORTH AND MIDDLE AMERICA. 727 



CHiETURA CINEREIVENTRIS LAWRENCEI Ridgway. 



LAWRENCE'S SWIFT. 



Similar to C. c. 2)hxopi/gos, 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."' 



Adult female.— hength (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. 



(?) Acanthylis o.ryura (not Tlirundo oxyura Vieillot) Leotaud, Ois. Trinidad, 



1866, 84. 

 Chatiira cinerciventris (not of Sclater) Wells, Proc. U. S. Nat. Mus., ix, 1886, 



620 (Grenada, AV. I.; habits).— Cory, Auk, v, 1888, 158 (Grenada); Birds 



West Ind., 1889, 294 (Grenada). 

 [Chsctura cinereiventris.] Subsp. a. Chxtura guiancnsis IIarteut, Cat. Birds Brit. 



Mus., xvi, 1892, 486, part (Grenada). 

 Chxtura cinereiventris guianensis Cory, Cat. West Ind. Birds, 1892, 106 (Gre- 

 nada).— Clark, Proc. Bost. Soc. N. H., xxxii, 1905, 273 (Grenada). 

 Ch[setura] cinereiventris guianensis Hartert, Das Tierreich, Podarg., Caprim., 



Macropt., 1897, 76, part. 

 Chsetura lawrencei Ridgway, Proc. U. S. Nat. Mus., xvi, no. 923, June 13, 1893, 



43 (Grenada, Le-sser Antilles; coll. U. S. Nat. Mus.). 

 C\hxtura\ cinereiventris lawrencei Ridgway, Proc. U. S. Nat. Mus., xvi, 1893, 44. 

 Chxtura cinereiventris lawrencei Ridgway, Proc. U. S. Nat. Mus., xvi, June 13, 



1893, 43 (Grenada; Tobago; Trinidad).— Chapman, Bull. Am. Mus. N. H., 



vi, 1894, 58 (Trinidad).— Robinson, Proc. U. S. Nat. Mus., xviii, 1896, 668 



(Margarita I., Venezuela).— IIellmayr, Novit. Zool., xiii, 1906, 37 (Triniddd; 



crit.); Verb. Om. Gesellscb. Bayern, viii, 1908, 154 (synonymy; descr.). 

 Chxtura guyanensis (not C. cinereiventris guianensis Hartert) Dalmas, Bull. Soc. 



Zool. France, xiii, 1900, 143 (Tobago). 

 [Chxtura] guianensis Sharpe, Hand-list, ii, 1900, 92, part (Trinidad; "Lesser 



Antilles"), 

 (f) Chxtura fumosa (not of Salvin?) Gherrie, Brookl. Inst. Arts and Sci., Science 



Bull., i, no. 8, 1906, 192 (Heights of Aripo, Trinidad). 



CHiETURA CINEREIVENTRIS PHiEOPYGOS Helimayr. 



GRAY-RUMPED CHIMNEY SWIFT. 



Similar to C. c. lawrencei, but upjjcr 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. c. 

 fumosa, but rump darker and less buflfy gray, the upper tail-coverts 

 concolor with the rump ; wing averaging shorter. 



Adults {sexes alike). — Pileum, hindneck, lores, back, scapulars, 

 wings, and tail deep, sliglitly glossy, bluish or greenish black; rump 



a One specimen, from Margarita Island, Venezuela. 

 & One specimen (type of the subspecies) from Grenada. 



