20 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 42. 



plate and description of which, moreover, apply very well to the Caro- 

 line Islands bird, subsequently called Cijpselus inquietus by KittlitzJ 

 Measurements of specimens of Collocalia fudphaga vanikorensis. 



COLLOCALIA FUCIPHAGA TACHYPTERA, new subspecies. 



Chars, subsp. — Sunilar to Collocalia fudphaga vanikorensis, but 

 much lighter, more brownish above, and paler below. 



Description. — Type, adult male. No. 188855, U.S.N.M.; Guam 

 Island, Mariana Islands, July 17, 1900; A. Scale. Upper parts 

 rather Ught smoky clove brown, with a slight greenish sheen, and 

 somewhat darker on pileum ; wings and tail clove brown with a slight 

 greenish gloss ; lores clove brown, the bases of the feathers pure white ; 

 sides of head and neck deep smok}' brown; lower surface hair brown; 

 lining of wing clove brown. 



Measurements. — Wing, 110 mm.; taO, 50; exposed cuLmen, 3.5; 

 tarsus, 8. 



Type-locality. — Guam Island, Mariana Islands. 



Geographical distribution. — Island of Guam, and probably other 

 islands of the Mariana group. 



The present form is distinguishable from Collocalia fudphaga 

 fudphaga chiefly by its dark-colored rump concolor with the back, 

 and by rather lighter upper surface. From Collocalia fudphaga 

 amechana it differs as does Collocalia f fudphaga, and additionaUy 

 in its lack of a pale rump. It is much smaller than Collocalia fud- 

 phaga elaphra, Ughter, more uniform above (the rump not paler than 

 the back), and darker belo^y. Compared with Collocalia fudphaga 

 capnitis, it is decidedly smaller, rather lighter and much more brown- 

 ish above, with the rump not even a httle paler than the back; is 

 more brownish on the lower surface, with much less evident dusky 

 shaft lines. It is somewhat smaller than Collocalia fudphaga vestita, 

 and decidedly lighter, more brownish above. It may be distinguished 

 from Collocalia fudphaga aerophila by somewhat smaller size, much 

 lighter, more brownish upper parts, and somewhat paler, decidedly 

 more brownish lower surface. From Collocalia fudphaga mearnsi 

 it may be separated by its much lighter, more brownish upper parts, 

 and darker, more brownish under surface. 



The single specimen upon which the above description is based was 

 recorded as Collocalia fudphaga fudphaga in my previous paper on 

 Collocalia,^ but judging from the material now available it must be con- 

 sidered as belonging to a distinct race. 



1 Denkw-urd. Rcise Russ. Amer., vol. 2, 1858, p. 26. 



2 ^advertently recorded (Proc. Acad. Nat. Sci. PWla., July 26, 1906, p. 187) as from Uala Island. 

 ' Proc. Acad. Nat. Scl. PhUa., July 26, 1906, p. 186. 



