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. 



Ooloratio7b. — Pileum and sides of head glossy black, back sooty 

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

 tail-coverts sooty black; rest of under parts white, the throat spotted 

 with dusky. 



Nidification. — (Unknown. ) 



Rcmge. — Guatemala. (Monotypic.) 



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 sooty 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 male.— LQngt}x (skins), 121-123 (122); wing, 94-96 (95); tail, 

 53-54 (53.5), forked for 17-20 (18.5); exposed culmen, 5; tarsus, 10; 

 middle toe, 8.5.« 



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

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



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

 nango. Barranca de los Chocoj^os, Calderas, ridge above Barsinas, Villa 

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



Atticora pileata Gould, Proc. Zool. Soc. Lond., xxvi, July 13, 1858, 355 (Guate- 

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

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

 GoDMAN, Biol. Centr.-Am., Aves, i, 1883, 230, pi. 15, fig. 2 (Ooban, Quich6, 

 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. 



lAtticord] pileata Gray, Hand-list, i, 1869, 72, no. 860. — Sclatbr and Salvin, 

 Nom. Av. Neotr., 1873, 14. 



" Two specimens, >> One specimen. 



