194 



PROCEEDINGS OF THE ACADEMY OF 



[April, 



feathering. In color C. u. amelis differs from C. fuciphaga fuciphaga 

 by reason of paler ventral surface, particularly the throat, and more 

 brownish upper parts, with lighter rump. It is paler, more brownish 

 above than C. f. vestita, with the rump noticeably lighter than the 

 back. Compared with C. /. elaphra it has the upper parts less brown- 

 ish, the crown particularly more blackish, the rump less different 

 from the back; lower surface less uniform, the posterior portion darker; 

 and size somewhat less. 



The small Celebes birds without tarsal feathering, mentioned by Mr. 

 Grant,^^ belong probably to this subspecies, for they are evidently not 

 Collocalia fuciphaga. Also the birds from St. Aigan Island, in the 

 Louisiade Archipelago, said by Dr. Hartert ^^ to be light below, to have 

 unfeathered tarsi, and to build nests different from C. fuciphaga, are 

 probably to be referred to C. u. amelis, though possibly subspecifically 

 distinct. Aside from the above, Collocalia u. amelis is not at present 

 certainly known except from the Island of Guam, where taken by Dr. 

 E. A. Mearns, July 20, 1905, and from the Philippine archipelago, where 

 it has been obtained on the Islands of Luzon, Verde, Cagayancillo, 

 Sibuyan, Panay, Mindoro, Mindanao, and Palawan. It may, however, 

 be quite generally distributed over the East India Islands, and may 

 have been recorded as Collocalia fuciphaga from various localities, since 

 hitherto it seems to have been confused with that species, because its 

 unfeathered tarsi were not considered significant. 



Measurements of part of the U. S. National Museum series of Collo- 

 calia unicolor amelis are as follows: 



'8 Ibis, 1895, p. 462. 



'" Novit. Zool, VI, 1899, p. 211. 



^» Type. 



