6. CH^TTTKA. 479 



narrower ou the uppurside. Total length about 7'5 inches, wing 

 7-4, tail 2-8. 



Hah. Roraima Mountains in British Guiana, and perhaps in some 

 high mountains of Colombia, while the true C. zonaris is also found 

 in Colombia. 



Probably the smaller form from Roraima is produced by the 

 isolated situation and great altitude of the mountains, and it is 

 doubtful whether the birds named Hemiprociie minor by Lawrence 

 really belong to the same small form. 



a, b. (^2 ad. .sk. Koraima, -SoOO ft., April Salvin-Godmau Coll. 



(W/iiMi/). 

 c. Ad. sk. Guiana (L'rown). Sclater Coll. 



<Z. Imm. sk. "Cote Ferme ■' (FwTe««.i'). Jardine Coll. 



e. Ad. st. Brit. Guiaua. 



7. ChaBtura biscutata. 



Chaetura biscutata, Scl. P. Z. S. 1865, p. 009, pi. 'Si (Rio Janeiro & 

 Ypanema) ; id. J. f. O. 1867, p. 130 ; Pelz. Orn. Bras. p. 15 

 (1867) ; Graj/, Hand-l. i. p. 07 (1869) ; Berl. Zeitsclir. gei. Orn. 

 1885, p. 155 (Rio Grande do Sul). 



Hemiprocne biscutata, -S'c/. S,- Sdlv/'n, Nomencl. Av. Neotrop. p. 95 

 (1873). 



Difters from C. zonaris in its collar not being complete, but 

 broken into a large white patch on the breast and nape by the dark 

 sides of the neck. Besides this the feathers of the chin are white 

 with brown borders and shaft-stripes ; front of head and short 

 superciliary stripe whitish. Total length about 9 inches, wing 8'3, 

 tail 3-2. 



Hah. South-eastern Brazil (Ypanema, Rio de Janeiro, Rio Grande 

 do Sul). 



a, b. cJ ad. sk. Ypanema, Brazil, June 25 (batterer). Sclater CoU. 



(Types of the species.) 

 c. 5 ad. sk. Rio de Janeu-o. Hardy CoU. 



8. Chaetura semicoUaris. 



Acanthylis semicoUaris, Sauss. Rev. Zool. 1859, p. 118. 



Chajtura semicoUaris, Scl. Cat. Am. B. p. 282 (1862) ; id. P. Z. S. 



1863, p. 99, 1865, p. 609 ; Scl. Sr Salvin, Ex. Orn. p. 52, pi. iii. 



(1866) ; Scl. J. f. O. 1867, p. 130; Scl. ■$■ Salvin, Nomencl. Av. 



Neotrop. p. 95 (1873). 

 Hemiprocne semicoUaris, Smnic/ir. Naturaleza, v. p. 250 (note of 



type) (1882). 



Adult. Blackish brown, with a narrow white band across the hind 

 neck ; no white on the underparts. Tail subequal. Total length 

 about 9 '5 inches, wing 9 '2, taU 3-1. 



Hah. Mexico. 



a. Ad. sk. Mexico {De Saussure). Sclater Coll. 



