44 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



or grayish sooty, the feathers with narrow and (except on under tail- 

 eoverts) usuall}" indistinct narrow terminal margins of paler; bill, etc., 

 as in adult male; length (skins) 136-161 (145.7); wing, 11.5-122 (118.5); 

 tail, 55-61 (59), forked for 12-14 (13); exposed culmen, 9.5-10 (9.9); 

 width of bill at frontal antia^, 7-8 (7.7); tarsus, 11-12 (11.7); middle 

 toe, 12-12.5 (12.2)." 



Galapagos Archipelago (Charles, Indefatigable, James, Albemarle, 

 Chatham, Barrington, and Duncan islands). 



Hirundo concolor (not of Sykes, 1832) Gould, Proc. Zool. Soc. Lond., 1837, 22 

 (Galapagos Archipelago; coll. of Zool. Soc. Lond.). 



\_Progne'} concolor Boxapaete, Consp. Av., i, 1850, 337. 



Progne concolor Baird, Review Am. Birds, 1865, p. 278.^Salvin, Trans. Zool. 

 Soc. Lond., ix, pt. 9, 1876, 476.— Shaepe, Cat. Birds Brit. Mus., x, 1885, 

 176 ("Chatham I.")^-— Ridgway, Proc. XJ. S. Nat. Mus., xii, 1889, 105 

 (Eden Rock, Indefatigable I.); xii, 1890, 105 (Indefatigable I.). — Roths- 

 child andHARTERT, Novit. Zool., vi, 1899, 152 (James, Charles, Indefatigable, 

 Chatham, Barrington and Albemarle islands); ix, 1902, 386, 417 (Gardner 

 Bay, Hood I.; Daphne L; Eden I., near Indefatigable; Chatham I.; Tagus 

 Cove, Albemarle I. ; habits; descr. eggs) .^Sharpe and Wyatt, Mon. Hirund. , 

 1894, 463, 487, pi. 90. 



Progne subis, var. concolor Baird, Brewer, and Ridgway, Hist. N. Am. Birds, i, 

 1874, 328. 



Hirundo modestal>iEBovx, Rev. Zool., 1840, 291 (Charles I.). ^ — Sundevall, Proc. 

 Zool. Soc. Lond., 1871, 125 (James I.). 



Progne 7nodesta GovhT), Zool. Voy. Beagle, iii, 1841, 39 (James I., Galapagos). — 

 Prevost and Des Murs, Voy. Venus, 1855, 182. — Ridgway, Proc. U. S. Nat. 

 Mus., xix, 1897, 505 (Charles, Indefatigable, and James islands). — Baur, 

 Am. Nat., xxxi, 1897, 782 (Albemarle and Duncan islands), 783 (Barrington, 

 and bet. Barrington and Indefatigable islands). 



Progne modestus Gould, Zool. Voy. Beagle, iii, 1841, jjl. 5. 



Genus PETROCHELIDON Cabanis. 



PetrocheUdon. c Cabanis, Mus. Hein., i, 1850, 47. {TyY>Q, Hirundo mdanogaster 



Swainson. ) 

 (?) Hylochelidon Gould, Handb. Birds Australia, i, 1865, 111. (Type, Hirundo 



nigricans Vieillot. ) 

 (?) Lagenoplastes Gould, Handb. Birds Australia, i, 1865, 113. (Type, CoUocaUa 



ariel Gould. ) 

 (?) Antrochelidon'i Baldamus, Journ. fiir Orn., xvii, Nov., 1869, 406. (Type, 



Hirundo nigricans Vieillot. ) (Cited by Sharpe and AVyatt as Amnochelidon. ) 



Small or medium-sized Hirundinidse with the nostrils roundish and 

 opening superiorly, the tarsus shorter than middle toe (without claw), 

 middle toe united to outer toe for about half its basal phalanx, tail 



« Four specimens. 



?' Although Dr. Sharpe gives Chatham Island as the locality of Darwin's specimen, 

 Mr. Darwin himself says he obtained it on James Island. 

 C'Von Tterpa, Fels, Klippe, und x^^i^cbv, Schwalbe." 

 'iFroui" Avrpov, a cavern; x^^^Scbv, swallow. (Richmond.) 



