1906.] 



NATURAL SCIENCES OF PHILADELPHIA. 



205 



species, is characterized by large size, and by very greenish upper parts, 

 inchiding wings and tail, with but slight tinge and very little or no 

 admixture of bluish. The United States National ^luseum possesses a 

 fair series from Sikakap Strait, North Pagi Island, off the western coast 

 of Sumatra ; and a specimen from Singapore is also identical. Borneo is 

 doubtfully included in the range of this race, as we have examined no 

 specimens from that island, and its bird may be like that of either the 

 Natuna Islands or even the Philippines, or may prove to be an endemic 

 form. 

 Measurements of Collocalia linchi linchi are as follows : 



CoUooalia linchi cyanoptila subsp. nov. 



Chars, subsp. — Similar to Collocalia linchi linchi, with which it 

 agrees in size, but upper surface of head and body much more bluish 

 in shade, and with considerable admixture of bluish purple; wings, 

 and particularly the tail, decidedly more bluish. 



Geographical distribution. — Natuna Islands and Linga Island. 



Description.— Type, adult female. No. 174,688, U. S. N. M.; Bung- 

 uran Island, Natuna Islands, July 1, 1900; Dr. W. L. Abbott. Upper 

 parts metallic dark bluish green, much mixed with bluish purple, 

 most noticeably so on posterior portion; tail bluish green decidedly 

 tinged with purplish; wings sepia brown, dull metallic purplish on 

 most of their exposed portions, the coverts more brightly colored, and 

 mixed with dark green; sides of head and neck, throat, breast, flanks, 

 and sides of body brownish slate, the feathers of the lores with cottony 

 white bases, those of throat and breast with inconspicuous pale gray or 

 whitish tips, those of lower breast, sides, and flanks broadly margined 

 and terminated with white; median portion of abdomen white with 

 some narrow slaty shaft streaks; lower tail-coverts dark bluish metallic 

 green, the longer ones immaculate, the shorter ones margined with 

 white; lining of wing dull dark metallic green. 



