N0.1U6. PROCEEDINGS OF THE NATIONAL MUSEUM. 563 



CAMARHYNCHUS PROSTHEMELAS, Sclater and Salvin. 

 (Plate LVI, fig. 10.) 



Camarhijnchus prosthcmelas, Sclater aud Salvix, Proc. Zool. Soc, 1870, pp. 323, 

 325, fig. 4 (Indefatigable Island, Galapagos Archipelago); Nom. Av. Neotr., 

 1873, p. 29. — Salvin, Traus. Zool. Soc, IX, I't. ix, 187G, p. 490.— Siiakpe, Cat. 

 Birds Brit. Mus., XII, 1888, p. 17 (ludefatigalile and James islands). — Kidg- 

 WAY, Proc. U. S. Nat. Mus., XII, 1889, p. 110 (part: Charles and James 

 islands). 



Specific characters. — Smallest species of the genus (wing not exceed- 

 ing 2.55). 



Range. — Galapagos Archipelago : Albemarle Island (Baur aud Adams) ; 

 Charles Islaud (Kinberg, Townseud,Baur aud Adams): Indefatigable 

 Island ([label, Baur and Adams); Jervis Island (Baur and Adams); 

 James Island {Albatross, Baur and Adams). 



Adult male.—^o. 115909, U.S.KM.; Charles Island, Galapagos, April 

 8, 1888; C. H. Townsend. Head, ueck, aud chest uniform black, end- 

 ing abruptly beneath in a convex outline; rest of under parts plain 

 buffy white, tinged with olive-gray laterally; rest of upper i^arts olive, 

 the feathers of the back with indistinct darker centers; remiges and 

 rectrices dusky, margined with grayish olive, the edges of the outer- 

 most primaries approaching grayish white. Bill, legs, and feet eutirely 

 black. Leugth (skin), 3.85; wing, 2.50; tail, 1.50; culmeu, 0.45; gonys, 

 0.22; depth of bill at base, 0.30; tarsus, 0.93; middle toe, 0.55. 



Adult male {in worn plumage). — Xo. 125970, U.S.X.M.; same locality 

 and collector, April 1, 1891. Essentially similar to the specimen de- 

 scribed above, but black of anterior lower parts not extending farther 

 backward than fore neck, the chest being whitish, broadly streaked 

 with dusky; upper parts, posterior to pileum, plain dusky olive-gray- 

 ish. Length (skin), 1; wing, 2.55; tail, 1.57; culmeu, 0.15; gonys, 0.22; 

 tarsus, 0.79; middle toe, 0.51. 



Immature male.— Eo. 110010, IJ.S.l^.M.; James Island, April 11, 1888; 

 C. H. Townsend. Pileum and hind neck dusky, the feathers very 

 indistinctly edged with grayish olive; rest of upper i^arts dull grayish 

 olive, the feathers of back dusky centrally; under parts (including 

 throat, etc.) dull grayish white, tinged with pale yellowish buff, pass- 

 ing into pale olive-brownish on sides and flanks, the chest and sides of 

 breast streaked with dusky. Otherwise as in adult male. Length 

 (skin), 4.15; wing, 2.52; tail, l.GO; culmen, 0.45; gonys, 0.21; depth 

 of bill at base, 0.30; tarsus, 0.78; middle toe, 0.58. 



Young male. — Ko. 421, collection of Dr. G.Baur; Indefatigable Island, 

 August 5, 1891. Above rather light olive-gray, becoming paler and 

 tinged with buffy on rump, the pileum and hind neck broadly and dis- 

 tinctly streaked with dusky, and feathers of the back and scapulars 

 with a large, sharply defined central spot of the same; wings and tail 

 dusky, the feathers margined with light olive-grayish, paler and 



