HliiUNDlXID.K — Tl [E SWALLOWS. 333 



ference between first and ninth ])rimary, 2."5; length of bill from forehead, .55; from 

 nostril, .34: ; along gape, .SG; width, .58 ; tarsus, .5.3 ; middle toe and claw, .79 ; claw alone, 

 .24 ; hind toe and claw, .52 ; claw alone, .25. 



Female (17,730, Monte Verde, Cuba, May 2 ; C. Wright). Above steel-blue, less glossy 

 than ill the male, and becoming lustreless dark smoky-brown on the forehead. Head, 

 laterally and beneath, with jugulum and sides, uniform brownish-gray (without darker 

 shafts or lighter borders to feathers, as in suhis) ; whole abdomen, anal region, and crissum 

 snowy-white, including the .shafts. Wing, 5.40; tail, 2.80 ; fork of tail, .70 deep. 



Young male (10,368, Cape Florida, May 18, 1858 ; G-. Wurdemann). Similar to tlie 

 female, but the steel-blue above more brilliant and continuous, the forehead and wings 

 being nearly as lustrous as the back ; throat and jugulum mixed with steel-blue leathers, 

 and crissum with some feathers of steel-blue bordered with whitish. Wing, 5.40 ; tail, 

 2.90 ; fork of tail, .80 deep. 



Had. Cuba, and Florida Ke3-s ? (Perhaps Bahamas.) 



This species has a close external resemblance to P. subis, for which it has 

 usually been mistaken. It is of nearly the same size, but the feet are dispro- 

 portionately smaller and weaker ; wliile the wings are shorter, the tail is as 

 long and more deeply forked ; the feathers considerably narrower, and more 

 attenuated (tlie outer .40 wide, instead of .46). The colors above are more 

 brilliant, and extend more over the greater wing-coverts and lining of wings, 

 while the quills and tail-feathers have a richer gloss of jjurplisli, changing 

 to gTeenish. An apparently good diagnostic feature is the concealed pure 

 wliite of the feathers aliotit the anal regions, replaced in suhis by grayish, 

 rarely approximating to whitish. 



A Progne collected by Mr. Wright, at Monte Verde, is duller in color than 

 that from Remedies, but has still more concealed white below, in the median 

 portion, not only of the anal feathers, but of those of the entire crissum and 

 of the belly. A female bird, whicli I presume to be the same species, can 

 scarcely be distinguished from the female of doviinicensis, exce])t in the 

 brownish shafts of the longer crissal feathers, and an almost imperceptible 

 tinge of brownish in the webs of the same feathers. It is almost exactly 

 like the P. kucofjastcr of Mexico and Central America. 



This species is included in the North American fauna in consequence of 

 the capture of a .specimen (No. 10,368 S /»>'■> May 18, 18.58) at Cajje Flor- 

 ida, which is with scarcely a doubt referable to it. This sf)ecimen is a 

 young male in its second year, so that it is difficttlt to ascertain po.sitively 

 its relationship to the two allied species ; but as it agrees perfectly in its pro- 

 portions with cryptoleuca, and its plumage differs from the corresponding one 

 of subis in essential respecjbs, we have Little hesitation in referring it to the 

 former. 



Nothing distinctive is recorded as to the habits of this bird. 



