I40 Field Museum or Natural History — Zoology, Vol. XIII. 



Chaetura cinereiventris sclateri^ {Pelzeln). Sclater's Swift. 

 Chaetura sclateri Pelzeln, Orn. Bras., 1868, p. 56 (Borba). 

 Chaetura cinereiventris sclateri Hellmayr, Verb, Orn. Gesell Bayem, VIII, 

 1908, p. 157; RiDGWAY, Bull. U. S. Nat. Mus., No. 50, V, 191 1, p. 716, in 

 key; Chapman, Biill. Am. Mus. N. H., XXXVI, 1917, p. 277 (Buena Vista, 

 Colombia). 

 Range: Eastern Peru, eastern Ecuador and central Brazil and 

 Colombia (Buena Vista). 



Chaetura cinereiventris guianensis Hartert. Guiana Swift. 



[Chaetura cinereiventris] Subsp. a Chaetura guianensis Hartert, Cat. Bds. Brit. 

 Mus., XVI, 1892, p. 486 (British Guiana). 



Range: British Guiana and Venezuela? 



Chaetura cinereiventris lawrencei {Ridgway). Lawrence's Swift. 



Chaetura lawrencei Ridgway, Proc. U. S. Nat. Mus., XVI, 1893, p. 43 (Grenada, 



Lesser Antilles). 

 Chaetura cinereiventris lawrencei Ridgway, Bull. U. S. Nat. Mus., No. 50, V, 



1911, p. 727. 



Range: Islands of Grenada, Tobago, Trinidad and Margarita 

 Island. 



Chaetura cinereiventris fumosa^ (Salvin). Smoky Swift. 



Chaetura fumosa Salvin, Proc. Zool. Soc. Lond., 1870, p. 204 (Bugaba, Chiriqui, 



Panama); Hartert, Cat. Bds. Brit. Mus., XVI, 1892, p. 483. 

 Chaetura cinereiventris fumosa Ridgway, Bull. U. S. Nat. Mus., No. 50, V, 19 11, 



P- 725- 

 Chaetura spinicauda fumosa Bangs, Proc. N. Eng. Zool. Club, IV, 1908, p. 25 

 (Costa Rica, crit.); Chapman, Bull. Am. Mus. N. H., XXXVI, 1917, p. 277 

 (crit. Costa Rica and Colombia). 



Range: Southwestern Costa Rica to northern Colombia. 



Chaetura cinereiventris occidentalis'= {Berl. and Tacz.). Western 

 Swift. 



Chaetura sclateri occidentalis Berlepsch and Taczanowski, Proc. Zool. Soc. 

 Lond., 1883, p. 569 (Chimbo, Ecuador). 



Chaetura cinereiventris occidentalis Hellmayr, Verb. Orn. Gesell Bayem, VIII, 

 1908, p. 158; Chapman, Bull. Am. Mus. N. H., XXXVI, 1917, p. 278 (Juntas 

 de Tamana and central Andes, between Cartago and Salento, Colombia). 



Range: Western Ecuador to Colombia. 



» Chaetura cinereiventris sclateri (Pelz.): Nearest to C. c. cinereiventris Sclater 

 but lower part of belly, crissum and lower surface of tail feathers dark bluish ashy 

 gray, similar to lower back and upper tail coverts. 



** Ridgway considers this to be a race of cinereiventris. I have seen no specimens. 



" Chaetura cinereiventris occidentalis Berlepsch and Taczanowski: Differs from 

 C. c. sclateri (Pelz.) in duller coloration of abdomen and much longer wing and tail. 

 Wing, 112; tail, 45 mm. 



