274 Bulletin American Museum of Natural History. [Vol. XXXVl, 



(945) Hydropsalis climacocerca Tsch. 

 Hydropsalis dimacocercus Tsch., Wieg. Arch, fiir Naturg., 1844, p. 269 (Peru). 



A male and two female adults, and two immature specimens from La 

 Morelia evidently represent this species which does not appear to have been 

 before recorded from Colombia. I have seen no other specimens. 



La Morelia, 4. 



(948) Nyctidromus albicollis albicollis (GmeZ.). 



Caprimulgus albicollis Gmel., Syst. Nat., I, 1788, p. 1030 (Cayenne). 



Nyciidromus guianensis Cass., Proc. Acad. N. S. Phila., 1860, p. 133 (Turbo). 



Nyctidromus albicollis Wyatt, Ibis, 1871, p. 375 (Lake Paturia); Scl. & Salv., 

 P. Z. S., 1879, p. 532 (Concordia; Remedios; Medellin); Robinson, Flying Trip, 

 p. 158 (R. Magdalena); Stone, Proc. Acad. N. S. Phila., 1879, p. 305 (Honda). 



We have found this species to be the commonest member of its family. 

 It is distributed throughout the Tropical Zone, and under favorable con- 

 ditions ranges upward to the lower border of the Subtropical Zone. None 

 of our twenty-six specimens has the wing over 158 mm., and they therefore 

 presumably all represent the resident South American form. There is, 

 however, as usual in this species, much variation in color. A male from La 

 Candela, for example, is paler above and below than any one of ten speci- 

 mens from Santa Marta {N. a. gilvus Bangs), but a female from the same 

 locality is darker than the average "albicollis." Specifeaens from the Pa- 

 cific coast average darker and smaller than those from the interior and doubt- 

 less represent a local race, but I have not a sufficiently large series of true 

 albicollis to determine its characters satisfactorily. 



Novita, 1 ; Los Cisneros, 1 ; Barbacoas, 1 ; Ricaurte, 1 ; San Antonio, 1 ; 

 Cali, 1; Rio Frio, 4; Puerto Valdivia, 1; La' Sierra, 2; La Candela, 2; 

 Chicoral, 1; Puerto Berrio, 2; Malena, 4; Algodonal, 1 (might be referred 

 to gilvus) ; Buena Vista, 1 ; Villavicencio, 2. 



(951) Thermochalcis cayennensis cayennensis (Gmel.). 

 Caprimulgus cayennensis Gmel., Syst. Nat., I, 1788, p. 1031 (Cayenne). 



We have found this species only at Villavicencio where it was locally 

 common in brushy places at the border of pastures, and at La Playa. Three 

 males taken at Villavicencio March 12, are apparently just finishing a com- 

 plete molt, involving both wings and tail. They are considerably paler 



