424 NORTH AMERICAN BIRDS. 



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

 with wliite throat, and a i>atch of the same on each side of rump, and other- 

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

 (4.70), and has the tail more deeply forked than P. melanoleuca. 



Synopsis of Species. 



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

 of throat transversely 'lefined j)osteriorly. Tail deeply forked, the lateral 

 feathers excessively attenuated and acute. 



Wing, 4.80; middle tail-feather, 1.20, external, 2.30. Hub. Cayenne 

 and Brazil var. cayanensis} 



Wing, 7.30; middle tail-feather, 1.90, external, 3.60. Hah. Guatemala. 



var. sancti-hieronym i.' 

 P. melanoleuca. Lustrele!?s dull black; no supraloral 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. Hah. Middle Proviuce 

 of United States, south tc Guatemala. 



Fanyptila melanoleuca, Baird. 



WUITE-THKOATED SWIFT. 



Cypschis melnnolcucus, Baird, Pr. A. N. Sc. Phil. VII, June, 1854, 118 (San Francisco 

 Mountains, N. M.). — Cassin*, Illnst. 1,1855, 248. Fanyptila mclajiokuca, Baikd, 

 Birds N. Am. 1858, 141, pi. xviii, f. 1. — Sclater & Salvix, Ibis, 1859, 125 (Guate- 

 mala). — ScLATEU, P. Z. S. 1865, 607. — Kexnerly, P. R. R. X, b, 36, ]il. xviii, f. 1. 

 — Heermanx, lb. X, c, 10. —Cooper, Orn. Cal. I, 1870, 347. 



Sp. Char. Wings very long ; tail forked ; tarsi and ^ overed with feathers. 



Black all over, except the chin, throat, middle of the bell} ir as the vent, a patch 



on each side of the rump, the edge of the outer primary, and biotches 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. 



Had. Xevada, Utah, Colorado, Arizona, and southern Rocky Mountains, to Guatemala. 

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

 57) ; San Diego (Cooper). . 



Altliough there is no difference in size betw^een 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 whitish 

 so conspicuous in most northern skins. In the Guatemalan female (30,837, 

 Duefias, February 13) the dusky of the lateral, and white of the medial, 

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



1 Panj/2}tila cayanensis (GyiFA..), Cab. Hirundo Cfty. Gmelix, Syst. Nat. I, 1024. PanyptUa 

 cay. Cabax. Wiegni. Archiv, XIII, 345 (1847). — Scl. P. Z. S. 1866, 606. 



* Panyptila sancti-hkronymi, Salvix (P. Z. S. 1863, 190, pi. xxii ; ScL. P. Z. S. 1866, 

 607). May be the northern form o( cayanensis, which, however, we have not seen. 



