556 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



A[nou^] leucocapillus Ridgway, Man. N. Am. Birds, 2d ed., 1896, 48 (not of 1st 

 ed., 1887). 



Micranous leucocapillus Saunders, Cat. Birds Brit. Mus., xxv, 1896, 145, part 

 (Glovers Reef, Brit. Honduras; Fernando Noronha Island, off n. Brazil 

 St. Paul Rocks; Ascension Island). — Salvin and Godman, Biol. Centr. - 

 Am., Aves, iii, 1903, 415 part (Glovers Reef and Southwest-of-all Cay, Brit. 

 Honduras). — Nicoll, Ibis, 1904, 36 (St. Paul Rocks, middle Atlantic Ocean 

 habits). 



[Micranous] leucocapillus Sharpe, Hand-list, i, 1899, 138, part (Caribbean Sea; 

 "E. America"). 



Megalopterus minutus atlanticus Mathews, Birds of Australia, ii, pt. 4, Nov. 1, 

 1912, 423 (Ascension Island; St. Paul Rocks; Fernando Noronha; Carib- 

 bean Sea; British Honduras). 



MEGALOPTERUS MINUTUS DIAMESUS (Heller and Snodgrass). 



CLIPPERTON NODDY. 



Similar to M. m. meXanogenys "- "but differs in being darker on the 

 shoulders, on the lower part and sides of the neck and on the sides 

 of the head, and in having a more slender and shorter bill and shorter 

 tarsus." 



Adults (sexes alike). — "Forehead and top of head almost pure 

 white, back part of head and nape with a plumbeous tinge. Back 

 of neck plumbeous, darkening into dark plumbeous on shoulders 

 and then into brown on the mantle. Rest of upper parts, except 

 upper tail-coverts and tail, dark dusky brown; outer webs of outer 

 primaries sooty brown, almost black; upper tail-coverts and tail 

 dark plumbeous-gray. Under parts dark dusky brown darkest on 

 lower breast and on belly. Low^er tail-coverts somewhat lighter 

 plumbeous-brown. Tail below same color as above. Lores and 

 line extending from lores over eye to middle of posterior side of 

 e3^e, black, a small white spot in this line above posterior part of eye. 

 Lower two-thirds of lower eyelid white. Cheeks deep dark plumbeous, 

 pale color of back of head and neck scarcely extending upon lateral 

 parts." 



Immature. — "Top of head pure white, with a few brown feathers 

 posteriorly. Outer webs of outer primaries blackish brown, that of 

 the first almost black. Lores, supraocular line and cheeks dusky 

 brown. All other parts pure dark brown, but with no dusky tinge 

 except on the lower part of the throat." 



a See p. 554. 



"In Micranous haivaiiensis [i. e. M. minutus melanogenys] the pale slaty plum- 

 beous color of the back of the head and neck reaches so far vontrally on the sides: 

 of the head and neck and even on the upper part of the Ijreast, that there is distinctly 

 marked off on the chin and tlu'oat a median longitudinal area of dark plumbeous 

 brown well defined on each side against the paler lateral parts." f Heller and 

 Snodgrass.) 



