HIRUNDINID^ — THE SWALLOWS. 333 



ference between first and ninth primary, 2.75; length of bill from forehead, .55; from 

 nostril, .34 ; along gape, .86 ; width, .58 ; tarsus, .53 ; 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 gloss\^ 

 tlian in 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 (10,3G8, Cape Florida, May 18, 1858 ; Gr. Wurdemann). Similar to the 

 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 feathers, 

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

 2.90 ; fork of tail, .80 deep. 



Hab. Cuba, and Florida Keys? (Perhaps Bahamas.) 



Thi.s species has a close external resemblance to P. suhis, for whieli it has 

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

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

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

 attenuated (the outer .40 wide, instead of .46). Tlie 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 purplish, changing 

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

 white of the feathers about the anal regions, replaced in suhis by grayisli, 

 rarely approximating to "svhitish. 



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

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

 ])ortion, not only of the anal feathers, btit of those of the entire crissum and 

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

 scarcely be distinguished from the female of dominicensis, except 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. IcucogasUr 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 juv., May 18, 1858) at Cape Flor- 

 ida, which is with scarcely a doubt referable to it. This specimen is a 

 young male in its second year, so that it is difficult to ascertain positively 

 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 suhis in essential respects, we have little hesitation in referring it to the 

 former. 



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



