652 BIRDS OF THE GJLAPACOS UKHIPELAGO—RIDGWAY. vol.xix. 



head, including" a little more than upper half of lores and auricular 

 region, dull slate color, deepening into blackish slate on occii)ut and 

 hind neck, and this into sooty black on rest of upper parts, some of 

 the feathers of the mantle having very indistinct paler terminal mar- 

 gins. A small spot above posterior portion of lores (continued in a 

 narrow streak over eye to its posterior angle), a crescentic spot on lower 

 eyelid (continued narrowly above upper margin of ear coverts), dull 

 white; lower portion of lores, entire side of head beneath ear-coverts, 

 sides of neck and chest, and entire lower parts, except under tail- 

 coverts and flank feathers, uniform i)ure white, this almost abruptly 

 defined against the dusky color of the hind neck; that on the sides of 

 the head, including about the lower half of the auricular region, and 

 separated from the white space on lower eyelid only by a very narrow 

 line of grayish dusky. Flank feathers with whole upper webs (except 

 concealed bases) and terminal portion of lower webs sooty grayish with 

 indistinct grayish white terminal margins. Under tail-coverts uniform 

 dark sooty, except median anterior feathers, which are sooty grayish 

 at tips, white basally. Under wing-coverts mainly white, but this 

 mostly covered by a clouding of brownish gray, the leathers of this 

 color having whitish terminal margins. Inner webs of primaries gray- 

 ish dusky passing through sooty grayish into grayish white at the base. 

 Bill (in dried skin) dusky horn cohu-; tarsi with inner side wholly light 

 colored, outer side dusky below and along posterior margin, otherwise 

 brownish: outer side of outer toe dusky, the inner side and all the rest 

 of the foot (including webs) light colored.' Total length (skin), 10.50; 

 wing, 7.45; tail, 2.95, lateral feathers, O.GO shorter; culmen, 1.10, from 

 nasal tubes, 0.8'i; depth of bill Just anterior to nostrils, 0.22; tarsus, 

 1.37; middle toe (without claw), 1.41. 



Adult female.— ^o. 132728, U.S.N.M.; Galapagos Islands, Marcli 28, 

 1801; r. 11. Townsend. Exactly like the male, as described ;ibove. 

 Length (skin), 10.80; wing, 7.35; tail, 2.85, lateral feathers, 0.(>0 shorter; 

 culmen, 1.08, from nasal tubes, 0.80; depth of bill in front of nostrils, 

 0.25; tarsus, 1.38; middle toe (without claw). 1.39. 



This well-marked species differs from P. aHduhoni in smaller size, 

 more slender bill, much more extensively and distinctly dusky under 

 tail coverts, greater amount of dusky on the flanks, less purely white 

 under wing-coverts, and particularly, as to coloration, by the greater 

 extent and sharper definition of the dusky on the side of the head, a 



' Mr. AtlaiMs' notes ou the fresh t-olors of iiii adult female are as follows: "Upper 

 mandible and tip of beak blaekiah slate, other parts of under mandible bluish gray 

 (No. 8, Kidfiway's Nomenclature of Colors); outer side of tarsus and outer toe black, 

 other parts a little more pinkish than ])earl blue.'' 



Of another specimen (sex not given) he notes as follows: " Inner side of tarsus 

 with a little mottling of hhie and pink added to pearl gray; outer upper portion of 

 tarsus with jiurple added ; lo%ver side of tarsus and outer toe brownish black; webs 

 with a little yellow (naples) added to pearl gray; middle toe more bluish than webs, 

 but inner toe with only a trace more blue than web. Upper mandible, except lower 

 basal i)ortion, slate black (also tii> of lower); rest of bill lYencli gray." 



