424 NORTH AMKKICA.V BIRDS. 



Three species of this genus are described by authors, all of them black, 

 with wliite throat, and a patch of the same on each side of rump, and other- 

 wise varied with this color. The type P. cayanensis is much the smallest 

 (4.70), and lias the tail more dec^ply f(jrked than P. melanoleuca. 



Synopsis of Species. 



P. cayanensis. Glossy intense black ; a supraloral spot of white ; white 

 of throat transversely defined posteriorly. Tail deeply forked, the lateral 

 feathers excessively attenuated and acute. 



Win,?, 4.80; middle tail-feather, 1.20, external, 2.30. ITab. Cayenne 

 and Brazil var. cayanensis} 



Wing, 7.30; middle tail-feathor, 1.90, external, 3.60. Bab. Guatemala. 



var. sancti-hierony mi.' 

 P. melanoleuca. Lu.strcless dull black ; no SMpralor;d white spot, but 

 instead a hoary wash ; white of throat extending back along middle of 

 abdomen to the vent. Tail moderately forked, the lateral feathers obtuse. 

 Wing, 5.75 ; middle tail-feather, 2.30, outer, 2.85. Hab. Middle Province 

 of United States, south to Guatemala. 



Panyptila melanoleuca, Baied. 



WHITE-THROATED SWIFT. 



Ci/pschis melnnohucus, B.\IRD, Pr. A. N. Sc. Phil. VII, June, 1854, 118 (San Francisco 

 Mountains, N. M.). — Cassis, lllust. 1,1855, 218. Panyptila inclanolcuca, Baikd, 

 Birds N. Am. 1858, 141, pi. xviii, f. 1. — Scl.\T£R & Salvin, Ibis, 1859, 125 (Guate- 

 mala). — ScLATER, P. Z. S. 1865, 607. — Kenserly, p. K. R. X, b, 36, pi. xviii, f. 1. 

 — Heermann, lb, X, e, 10. — Cooper, Oni. Cal. I, 1870, 347. 



Sp. Char. Wings very long ; tail forked ; tarsi and feet covered with feathers. 

 Black all over, except the chin, throat, middle of the belly as far as the vent, a patch 

 on each side of the rump, the edge of the outer primary, and blotches on the inner webs 

 of the median tail-feathers, near the base, which are white, as is also a band across the 

 ends of the secondaries. Length, 5.50 ; wing, 5.50 ; tail, 2.70. 



Hab. Nevada, Utah, Colorado, Arizona, and southern Rooky Mountains, to Guatemala. 

 Localities : Cajon Pass (Cooper, Pr. Cal. Ac. 1861, 122) ; Arizona (Coues, P. A. N. S. 1866, 

 57) ; San Diego (Cooper). 



Although there is no difference in size between Rocky Mountain and 

 Guatemalan specimens, the only two of the latter in the collection are darker 

 colored, showing scarcely any indication of the frontal and supraloral wliitish 

 so conspicuous in most nortliern .skins. In tlie Guatemalan female (30,837, 

 Duenas, February 13) the dusky of the lateral, and wliite of tlie medial, 

 portions of the breast blend gradually together, there not being that sharp 



» Panyptila cayanensis {Gi[F.l..), Cab. ffirundo cay. Gmelix, Syst. Nat. I, 1024. PanyptUa 

 cay. Caban. Wiegm. Archiv, XIII, 345 (1847). — Sou P. Z. S. 1866, 606. 



'^ Panyptila sancti-hierony mi, Salvix (P. Z. S. 1863, 190, pi. x.xii ; Sri,. P. Z. S. 1866, 

 607). May be the northorn form of cayanensis, which, however, we have not seen. 



