476 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



BIRDS COLLECTED AT GUAM ISLAND. 



HALCYON CINNAMOMINUS Wm. Swainson. 



Cat. No. 211254, female adult. Guam, November 19, 1907. 

 COLLOCALIA BARTSCHI, new species. 

 GUAM ISLAND SWIFTLET. 



Type.—^o. 211255, U.S.N.M. Adult female, collected on the island 

 of Guam, Pacific Ocean, November 20, 1907, by Dr. Paul Bartscli. 



Characters. — Most closely related to Collocalia nnicolor amelis 

 Oberholser, described from specimens taken in the Benguet High- 

 lands of Luzon, Philippine Islands. Its naked tarsus and much 

 paler coloration at once separate it from Collocalia fuci/phaga; and 

 the absence of a whitish band across the rump distinguishes it from 

 members of the Collocalia francica group. 



An adult male specimen (Cat. No. 20056G, U.S.N.M.) of this 

 species which I collected on Guam Island, July 20, 1905, is labeled 

 " Collocalia ii. amelis " in Mr. Oberholser 's handwriting. Although 

 Oberholser mentioned this specimen under Collocalia itn'icolor amelis ., 

 and included the island of Guam in the area of distribution of that 

 form in his " Monograph of the Genus Collocalia," published in 

 the Proceedings of the Academy of Natural Sciences of Philadelphia, 

 pp. 193 and 194, issued July 20, 1906, he did not include it in the 

 table of measurements which concludes the description, which cir- 

 cumstance suggests that its small size led him to consider its identity 

 M'ith amelis doubtful. 



The wing is shorter than in Collocalia u. amelis while the tail is, 

 relatively, a little longer, with the tail-feathers and upper tail-coverts 

 much broader. The color differs from amelis in being paler on the 

 hind-neck and sides of rump, the back a slightly paler and warmer 

 brown, and the under parts decidedly paler, becoming almost silvery 

 whitish on the chest. 



This new species is named in honor of Dr. Paul Bartscli in recog- 

 nition of this imiwrtant contribution of birds to the collection of the 

 U. S. National Museum, made in connection with the operations of 

 the Albatross Philippine Expedition. 



The following table gives comparative measurements: 



No. of 

 speci- 

 mens. 



Name. 



Locality. 



Exposed Tar- 

 culmen. sus. 



Male 



Female 



(?) 



(?) 



Male 



Female 



Collocalia bartschi 



Collocalia bartschi 



Collocalia unicolor uni- 



ColOT. 



Collocalia unicolor uni- 

 color. 

 Collocalia unicolor amrli.i. 



Collocalia unicolor amelis. 



Guam Id 



(lUam Id 



Ceylon 



Ceylon 



BonRuot Prov., Luzon 



Id., I'. I. 

 B(uiKnpt I'rov., Luzon 



Id., r. I. 



mm. 

 3.9 

 3.9 

 4.5 



4 



4.8 



5 



mm. 



8.8 

 8.6 

 10 



9. 5 



9.9 



10 



