PROGNE. 



from Atlantic to Pacific, as well as from Cape St. Lucas, 

 special localities are as follows : — 



2n 



Some 



(1,129.) 7.80; 16.50; 5.92. (1,-596.) 8.16; 16.60; 6.00. 



Progne cryptoleuca. 



Progne cryptoleuca, Baikd. 



Jlirundo purpurea, D'Okb, Sagra's Cuba, Ois. 1840, 94 (excl. syn.). — 

 Progne purpurea, Cab. Jour. 1856, 3. — Gundlach, Cab. Jour. 1861. 



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



(J^o. 34,242, '^ .) Color much as in P. subis — ricli steel blue, with purple 

 or violet gloss ; the wings and tail, however, much more decidedly glossed, and 

 with a shade of greenish. The feathers around the anus and in the anterior 

 portion of crissum with dark bluish down at base, pure snowy white in the 

 middle, and then blackish, passing into the usual steel blue. The white is 

 entirely concealed, and its amount and purity diminish as the feathers are 

 more and more distant, until it fades into the usual gray median portion of 

 the feather. The usual concealed white patch on the sides under the wings. 



(No. 34,242.) Total length, 7.60; wing, 5.50; tail, 3.40; perpendicular 

 depth of fork, .86 ; diiference between 1st and 9th 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. 



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 disproportionately smaller and weaker ; while 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). The colors above are more brilliant, and ex- 

 tend 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 region, replaced in subis by 

 grayish, rarely approximating to whitish. 



