ATTICORA. 



307 



Atticora pileata. 



Atticora pileata, Gould, Pr. Z. S. 1858, 355 (Guatemala). — Sclater & 

 Salvin, Ibis, I, 1859, 13. 



Hab. Guatemala. 



(No. 30,714, % .) Top and sides of head and neck black, with dull bluish 

 gloss. Interscapular region and sides of body smoky brown ; above passing 

 rather gradually into blackish-brown of rump, wings, and tail ; beneath ab- 

 ruptly defined against blackish-brown of crissum. Rest of under parts and 

 tibiae white ; this color, however, on the chin, throat, and jugulum (the former 

 two especially) margining the feathers narrowly only, and exposing much of 

 the smoky brown bases. Tibial feathers brown at base. 



(No. 30,714, % .) Total length, 4.75 ; wing, 3.75 ; tail, 2.45 ; depth of fork, 

 .75 ; difference of primaries, 1.75 ; length of bill from forehead, .33, from 

 nostril, .17, along gape, .43, width, .35 ; tarsus, .43 ; middle toe and claw, .50, 

 claw alone, .20 ; hind toe and claw, .35, claw alone, .17. 



This species is totally different in appearance from any other known 

 American Swallow. Cabanis is in error in suggesting that it may 

 be the young of cyanoleuca. 



Neochelidon, Sclater. 



Neochelidon, Sclater, Catal. Am. Birds, 1862, xvi. (Type Hirunclo 

 tibialis, Cassin.) 



Microchelidon, Sclater, Catal. 1861, 39. (Same type ; name pre- 

 occupied.) 



Similar to preceding in bill and toes ; the tarsus, however, with the joint 

 covered with feathers, which invade the inner face at the upper end. Tail 

 less forked ; fork one-fourth the length. 



Atticora tiliialis. 



Petrochelidon tibialis, Cass. Pr. A. N. So. 1853, 370 (Brazil). — Micro- 

 chelidon tibialis, Sclater, Catal. 1861, 39, no. 238. — Neochelidon 

 tibialis, Sclater, Catal. 1862, xvi (Errata). 



Hab. Isthmus of Panama to Brazil. 



The type of the section is the H. tibialis, of Cassin. This species 

 is the least of our Swallows, and resembles a Swift rather than a 

 Swallow. It is dark smoky or sootj brown above and on crissum,, 



