S0.1116. rnocKEDixas of the xaiioxal museum. 643 



Specific characters. — Similar to A. stoUdus (LinufBus), but much 

 darker and less brown, tlie bead and neck almost slate color, and the 

 forehead, in most perfect plumage, mouse gray, slightly i)aler along the 

 edge, adjoining the black lores. (Many specimens, apparently adults, 

 have the forehead but little grayer than the occiput). 



Baitgc. — Galai)agos Archipelago: Albemarle Island (Baur and 

 Adams); Charles Island (Markham); Hood Island {Albatross, Baur 

 and Adams); Chatham Island (Kellett and Wood, Townsend); Tower 

 Island (Baur and Adams); Wenman Island (Townsend). 



Adult male {fresh plumage). — No. 12G004, U.S.N.M. ; off Wenman 

 Island, April 1, 1891 ; C. II. Townsend. Head, neck, and chest uniform 

 deep brownish slate, becoming darker on the lores, especially along 

 their upper margin and immediately in front of the eyes, where nearly 

 black, lighter and grayer on pileum, where becoming gradually paler 

 anteriorly, the whole forehead being uniform smoke gray, lighter, 

 approaching grayish white, in a narrow line along the lateral edge, 

 next to the blackish anteorbital patch; a small white spot a little pos- 

 terior to the middle of the upper eyelid and lower eyelid white for 

 nearly its whole length, the space between the posterior extremity of 

 the latter and the white spot on upper eyelid black. Rest of the 

 plumage, in general, uniform deep sooty slate-brown, browner on wing- 

 coverts and middle under parts, more slaty on back, rump, and upper 

 tail-coverts; remiges sooty black; primary coverts and rectrices more 

 blackish slate. Bill entirely deep black; legs and feet brownish black. 

 Length (skin), 15.L*5; wing, 11.10; tail, (J, graduated for 2; culmen, 

 1.57 ; depth of bill at base of culmen, O.Il ; tarsus, 0.95 ; middle toe, 1.18. 



Adult female {fresh plumage). — No. 115970, U.S.N.M.; Dalrymple 

 Rock, Chatham Island, April 5, 1888; C. H. Townsend. Exactly like 

 the adult male in plumage. Length (skin), 15.75; wing, 10.80; tail, 

 6.05, graduated for 1.70; culmen, 1.01; depth of bill at base of culmen, 

 0.41; tarsus, 0.98; middle toe, 1.20. 



Adult male {previous to molting.) — No. 116091; U.S.N.M. ; Hood 

 Island, A])ril 7, 1888; C. H, Townsend. Similar to the fully adult, as 

 described above, bnt rather darker above and browner beneath, the 

 pileum dark sooty slate, approaching a decided gray only along the 

 lateral margin, adjoining the black loral s^iace. Length (skin), 11.50; 

 wing (primaries molting); tail, 5.92, graduated for 2; culmen, 1.53; 

 depth of bill at base of culmen, 0.39; tarsus, 0.93; middle toe, 1.15. 



Adult female {before molting). — No. 126003, U.S.N.M.; Wenman 

 Island, April 4, 1891 ; C. H. Townsend. Similar to the male in same 

 condition of i^lumage. Length (skin), 15; wing, 10.; tail, 5.75, grad- 

 uated for 2; culmen, 1.40; depth of bill at base of culmen, 0.39; tar- 

 sus, 0.98; middle toe, 1.20. 



While very distinct from A. stolidus (Linnanis), the character upon 

 which the separation from that species of A. galapagensis was based 

 ("crown of head uniform brown like the rest of the upper surface") 



