BIRDS OF NORTH AND MIDDLE AMERICA. 99 



Bill short, broad, and thick, its width at frontal antise equaling or 

 exceeding length of exposed culmen, the latter much less than distance 

 from nostril to eye; depth of bill at nostrils much more than half its 

 width at same point; tip of maxilla very slightly uncinate, the tomium 

 straight, with subterminal notch small but distinct; nostril small, 

 longitudinally ovate, only the edge of the overhanging operculum 

 showing beneath the feathering of the frontal antiae. Rictal bristles 

 distinct. Tail more than half as long as wing, forked for more than 

 one-third its length, the lateral rectrices rather narrow and distinctly 

 contracted terminally, their tip obtusely pointed. Tarsus longer than 

 middle toe (without claw), the inner and posterior portions entirely 

 naked, the extreme upper portion feathered for a short distance in 

 front; basal phalanx of middle toe united ^to that of outer toe by about 

 half its length or a little more, to the inner toe by nearly as much; 

 claws of lateral toes reaching nearly to base of middle claw. 



Coloration. — Above soft (not glossy) green, becoming blue or violet 

 on rump and upper tail-coverts, thp plumage structurally similar to 

 that of Tachycineta; no white tuft on sides of rump; under parts 

 entirely white. 



Nidification. — (Unknown. ) 



Range. — Bahama Islands. (Monotypic.) 



CALLICHKLIDON CYANEOVIRIDIS (Bryant). 

 BAHAMA SWALLOW, 



Admit' male. — Pileum, hindneck, back, and scapulars, plain soft 

 (not glossy) metallic dull bottle green, changing to soft metallic bluish 

 myrtle green or greenish blue on lesser wing-coverts, rump, and 

 upper tail-coverts; middle and greater wing-coverts and tertials dusky 

 greenish blue, broadly margined with lighter and brighter greenish 

 blue or bluish green; alula, primary coverts, primaries, secondaries, 

 and rectrices dark greenish blue narrowly edged with lighter greenish 

 blue or bluish green, the lateral rectrices very narrowly edged with 

 whitish, their inner webs more broadly but less sharpty edged with 

 the same; lores dusky; auricular, suborbital and malar regions, axil- 

 lars, under wing-coverts and entire under parts pure white; bill black; 

 iris brown; legs and feet brownish black or blackish brown; length 

 (skins), 139-160 (145.6); wing, 113-117 (115); tail, 66-73 (67.9), forked 

 for 25-31 (27.1); exposed culmen, 6-7 (6.4); tarsus, 11.6-12 (11.8); 

 middle toe, 10-11 (10.8). « 



Adult female. — Similar to the male, but more or less duller in color, 

 with white of auricular region (sometimes that on sides of breast — 

 more rarely that on center of chest) mottled with grayish brown; 

 length (skins), 130-140- (135); wing, 105-109 (107.5); tail, 59-61 (59.5), 



»SeverL specimens, 



