66 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



half as long as wing (longer than distance from bend of wing to tip 

 of longest secondaries), forked for about one-third its length, the 

 lateral rectrices tapering terminally, with tip narrow but rounded. 

 Tarsus longer than middle toe without claw, entirely naked, even to 

 the tibio-tarsal joint; middle toe united to outer by whole of basal and 

 about half its subbasal phalanx, to the inner by about half the basal 

 phalanx; lateral claws not reaching to base of middle claw. 



Coloration. — Pileum and sides of head gloss}^ black, back soot}'^ 

 brown; wings and tail sooty black; sides and flanks sooty brown, under 

 tail-cove^rts sooty black; rest of under parts white, the throat spotted 

 with dusky. 



Nidification. — (Unknown. ) 



Range. —Guatemala. (Monoty ]3ic. ) 



NOTIOCHELIDON PILEATA (Gould), 

 COBAN SWALLOW. 



Adults {sexes alike). — Pileum, hindneck, and side of head and neck 

 uniform glossy black with a faint bluish luster; back and scapulars 

 plain grayish brown (dark hair brown to sepia), becoming darker on 

 rump and deepening into sooty black or dark sooty brown on upper 

 tail-coverts; lesser wing-coverts glossy black or brownish black; rest 

 of wings brownish black, fading into dark grayish brown or soot}^ on 

 secondary and innermost greater wing-coverts; tail dull black or sooty 

 black; malar region, chin, and throat white, spotted or flecked with 

 sooty .brown; median portion of chest, breast, and abdomen uniform 

 white; sides of chest, sides, flanks, axillars, and under wing-coverts 

 plain grayish brown; under tail-coverts sooty black or very dark sooty 

 brown; bill black; legs and feet dusky brown (in dried skins). 



Adult m«^(?.— Length (skins), 121-123 (122); wing, 94-96 (95); tail, 

 53-54 (53.5), forked for 17-20 (18.5); exposed culmen, 6; tarsus, 10; 

 middle toe, 8.5.^' 



Adult female. — Length (skin), 117; wing, 94; tail, 53, forked for 20; 

 exposed culmen, 5; tarsus, 10; middle toe, 9.'' 



Highlands of Guatemala (Coban, Quiche, Totonicapam, Quezalte- 

 nango. Barranca de los Chocoyos, Calderas, ridge above Barsinas, Villa 

 Lobos, Aceytuno, Volcan de Santa Maria, etc.). 



Atticora plleata Gould, Proc. Zool. Soo. Lond., xxvi, July 13, 1858, 355 (Guate- 

 mala; coll. J. Gould). — ScLATER and Salvin, Ibis, 1859, 13 (Guatemala). — 

 Baird, Review Am. Birds, 1865, 307 (Coban, Guatemala). — Salvin and 

 GoDMAxN, Biol. Centr.-Am., Aves, i, 1883, 230, pi. 15, fig. 2 (Coban, Quiche, 

 Totonicapam, Quezaltenango, Barranca de los Chocoyos, Calderas, ridge 

 above Barsinas, Villa Lobos, and Aceytuno, Guatemala) .— Sharpe, Cat. Birds 

 Brit. Mus., X, 1885, 188, 635.— Sharpe and Wyatt, Mon. Hirund., 1894, 513, 

 518, pi. 100. 



\_Atticora] pileata Gray, Hand-list, i, 1869, 72, no. 860. — Sclater and Salvin, 

 Nom. Av. Neotr., 1873, 14. 



o Two specimens. '' One specimen. 



