ALCID.K — THE AL'KS — JJliACII VIlAMI'HUS. 409 



A. Tarsus iiuicli slioitcr than tlie miililli; tou \vith(jut its claw. 



1. B. marmoratus. Wing, 5.00 inches; cnlnien, .G()-.7<) ; depth of bill at anterior enrl of 

 nostril, .24 ; widtli at same point, .15 ; tarsus, .70 ; middle toe, .92-1. (KJ. Summer jda- 

 mage: Dusky a1)ove, barred with rusty ; below, mixed white and fuliginou.s. Winter jtlu^ 

 miuje : Above, dusky, interrupted l)y a white nuchal collar ; leathers of back, etc., tipperl 

 with plumbeous. Entire lower parts white. Ilab. Pacific coast, south to Santa Cruz, (^al. 

 2. B. Kittlitzi. Wing, 5.10-5.80 inches ; culmen, .40-.45 ; depth of bill at anterior end of 

 nostril, .20-.22 ; width at same point, .15 ; tarsus, .60-. G5 ; middle toe, .8.5-.!J5. Summer 

 lilumarje: Above, plumbeous, with indistinct narrow bars of black and very irregular 

 (mostly longitudinal) spots of creamy Iniff ; lower parts chiefly white, the Jugulum ami 

 entire sides strongly overlaid by creamy buff, and heavily, but irregularly, barred and 

 spotted with blackish ; other lower parts (e.xcept anal region and crissum) more faintly 

 marked with bars (mostly crescentic) of grayish dusky. JFinter plumaye : Above, plum- 

 beous, the Ijack and rump indistinctly and narrowly barred with white ; entire .side of 

 head (including whole of lores and superciliary regi(jn), narrow but distinct nuchal collar, 

 and entire lower parts immaculate pure white ; sides of breast crossed by a Itroad band of 

 grayish slate, narrowing toward middle of jugulum. Bill black ; iris brown ; feet light 

 brown, in dried skin (livid purplisli gray in life?). Hub. From Northern Japan and 

 Kamtschatka to Unalashka. 

 [3 ? B. brevirostris.i Wing, 5.25 inches ; culmen, .50 ; tarsus, .50. Adult, summer plu- 

 mage: Above, grayish brown, the head and Ijack spotted with white ; below, white, waved 

 and spotted with brown ; bill black ; feet yellow, the webs and claws brown. Rah. Sau 

 Bias, W. Mexico.] 



B. Tarsus equal to the middle toe, without claw. 



4. B. hypoleucus. Wing, 4.50-5.25 ; culmen, .70-.80 ; tarsus, .90-.95 ; middle toe, .85. 



Lining of wings white ; above, plain dark slaty ; below, wholly pure white. I/ab. San 

 Diego to Cape St. Lucas. 



5. B. Craverii. Wing, 4.60; culmen, .78-80 ; tarsus, .88-90 ; middle toe, .80-88. Lining 



of wings smoky gray or slaty. Otherwise similar to B. hypoleucus. Hub. Lower Cali- 

 fornia. 



Erachyramphus marmoratus. 



THE MARBLED GUILLEMOT. 



Colymbus marmoratus, Gmel. S. N. I. ii. 1788, 583, no. 12. 



Brachyramphus (Apohapton) marmoratus, Bii.\ndt, Bull. Ac. St. Petersb. II. 1837, 346. 



Brachyrhamphus marmoratus, GnxY, Gen. B. III. 1849, 644. — Cas.s. iu Buird's B. N. Am. 1858, 



915. — Baird, Cat. N. Am. B. 1859, no. 732. — Cones, Pr. Ac. Nat. Sci. Philad. IStkS, 61; 



Key, 1872, 344 ; Check List, 1873, no. 629 ; ed. 2, 1882, no. 8G6. — KiDcnv. Nom. N, Am. B. 



1881, no. 755. 

 Cepphus perdix, Pall. Zoog. Rosso-As. II. 1826, 351, pi. 80. 

 Brachyramphus Wrangdi, Biiandt, Bull. Ac. St. Petersb. II. 1837, 344. — Cass, in Baird's B. N. 



Am. 1858, 917. — Baird, Cat. N. Am. B. 1859, no. 733. — Coues, Pr. Ac. Nat. Sci. Philad. 



1868, 63. 

 Uria Townscndii, AuD. Orn. Biog. V. 1839, 251, pi. 430 ; B. Am. oct. cd. VII. 1844, i»l. 475. 



Hab. Coasts and islands of the North Pacific, south, on the American side, to San Diego, Cal. ; 

 breeds at least as far south as Vancouver's Island. 



Sp. Char. Adult, full breeding-plumage: Above, dusky, the back, scapulars, rump, and upper 

 tail-coverts barred with rusty, the tips of the leathers being of this color. Lower parts fuliginous, 

 more or less mixed with white, the under-lying portion of the feathers being of the latter color ; 

 the lower parts never uniform fuliginous, but usually with this color largely predominating. 



1 Brachyriiami'IIUs mtKViuosTRis. — Short-billed Ouillnniot. 



Uria hrcvirostris, Vltt. Zool. Jour. IV. 1828, 357 ; Zool. Bocchcy's Voy. 1830, Orn. p. 32 (San 

 Bias). (This is possibly the same as B. Kittlitzi.) 



