130 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIII. 



Range: Guiana, Venezuela, north Brazil, Colombia and Trinidad? 

 6: British Guiana 2; Venezuela (Encontrados, etc.) 3; and north 

 Brazil (near Boa Vista) i. 



*Thermochalcis cayennensis tobagensis* (Ridgway). TOBAGO STENOP- 



sis. 

 Stenopsis tobagensis RIDGWAY, Proc. Biol. Soc. Wash., xxi, 1908, p. 195 



(Tobago). 



ICaprimulgus leopetes JARDINE and SELBY, Illust. Orn. Ser., I, Vol. II, pi. 87 

 (Tobago); CHAPMAN, Bull. Am. Mus. N. H., XXXVI, 1917, p. 275, in text 



(ait). 



Range: Island of Tobago; Trinidad? 

 2 : Tobago. 



*Thermochalcis cayennensis insularis (Richmond). ISLAND STENOPSIS. 



Stenopsis cayennensis insularis RICHMOND, Proc. Biol. Soc. Wash., XV, 1902, p. 159 



(Curacao Island); RIDGWAY, Bull. U. S. Nat. Mus., No. 50, VI, 1914,?. 499. 



Range : Curacao Island, Bonaire Island and Margarita Island ; coast 

 of Venezuela? 



2 : Margarita Island. 



Thermochalcis cayennensis monticola b (Chapman). COLOMBIAN 

 STENOPSIS. 



Stenopsis cayennensis monticola CHAPMAN, Bull. Am. Mus. N. H., XXXIII, 

 1914, p. 172 (San Antonio, alt. 6,600 ft., western Andes above Cali, Colombia) ; 

 Id., XXXVI, 1917, p. 275 (San Antonio, Western Andes). 



Range: Colombia. 



Thermochalcis cayennensis albicauda (Lawrence). WHITE-TAILED 

 STENOPSIS. 



Stenopsis albicauda LAWRENCE, Ann. Lye. Nat. Hist., N. Y., XI, 1875, p. 89 



(Talamanca, Costa Rica). 

 Stenopsis cayennensis albicauda, RIDGWAY, Bull. U. S. Nat. Mus., No. 50, VI, 



1914, p. 502. 



Range: Costa Rica and Panama. 



a Thermochalcis cayennensis tobagensis (RIDGWAY): Differs from T. c. cayen- 

 nensis (GMEL.) in lighter coloration and more white on the lateral rectrices, and 

 wing and tail shorter. Differs from T. c. insularis (RICHMOND) in having inner webs 

 of all rectrices (except middle pair) mostly white; tail shorter. Very close to T. c. 

 cayennensis (see Ridgway, Bds. N. & M. Am., VI, 1914, p. 498, footnote). It is 

 probable that if the Tobago bird proves separable, it should stand as Thermochalcis c. 

 leopetes Jardine and Selby. 



b Thermochalcis cayennensis monticola (CHAPMAN): Differs from T. c. cayen- 

 nensis (GMEL.) in having longer wings and tail and bill larger; breast and flanks more 

 heavily barred and tail bands wider. The female is much darker (and other char- 

 acters). Differs from T. c. albicauda (LAWRENCE) in males having the black bar 

 crossing the white vane of the tail feathers (and other characters). The female is 

 darker above and much deeper buff below than in albicauda. 



