BIRDS OF NORTH AND MIDDLE AMERICA. 509 



basal width of mandible, 7.62; basal depth of bill, 9.40; tarsus, 24.13; 

 middle toe, 17.02.' 



Of this apparently very distinct species I have seen but one speci- 

 men. Although the general dimensions are nearer those of G. fortis 

 than any other form of the genus, the bill is scarcely larger than in 

 G. fullginosa, and has exactly the same form as in that species. 



Galapagos Archipelago (James Island). 



Geospiza debilirostns Ridgway, Proc. U. S. Nat. Mus., xvii, no. 1007, Nov. 15, 

 1894, 363 (James I., Galapagos Archipelago; collection U. S. Nat. Mus. ) ; xix, 

 1897, 533, pi. 57, fig. 19 (monogr. ). — Rothschild and Hartbrt, Novit. Zool., 

 vi, 1899, 163, pi. 6, fig. 29 (crit.). 



GEOSPIZA SCANDENS (Gould). 

 CACTUS FINCH. 



Bill elongate-conical, with its basal depth much less than the length 

 of the gonys, and the basal width of the mandible (across chin) still 

 less; culmen slightly convex, nearly straight in middle portion, scarcely 

 arched basally, and not more than 18.54 (usuallj^ about 17.78) in length. 



Adult male. — Entirely unifoiun deep black; bill wholly deep black; 

 legs and feet brownish black; "iris dark brown." 



Immature male. — Head and neck dull blackish, slightly broken on 

 chin and throat by a few narrow whitish streaks; postocular region, 

 hindneck, and upper parts dull grayish olive (more decidedly oliva- 

 ceous on lower back and rump), the feathers of the back extensi\'ely 

 blackish centrally, producing a spotted appearance; wings and tail 

 dusky, the feathers with grayish olive margins, the middle and greater 

 wing-coverts conspicuously margined terminally with pale brownish 

 buffy, and the primaries narrowlj^ edged with light olive-grayish; 

 under parts, posterior to throat, pale olive-buffy, tinged with pale 

 brownish laterally, the feathers of the chest, upper breast, sides, and 

 flanks with broad central spots of dusky, larger and more distinct ante- 

 riorly; under tail-cove its with rather indistinct central spots of gray- 

 ish; bill whoU}^ deep black; legs and feet brownish black; "iris dark 

 brown." 



Adult female. — Similar to the immature male described above, but 

 head grayish olive, streaked with dusky, the chin and throat narrowly 

 streaked with buffy grayish white and dusky ; under parts more strongly 

 tinged with light buffy brown, with spots on breast, etc. , narrower and 

 rather less distinct; light terminal margins to wing-coverts broader 

 and more cinnamomeous, especially those on middle coverts; mandible 



^Type, No. 116003, U. S. Nat. Mus., James Island, April 11, 1888, C. H. Townsend. 

 Messrs. Rothschild and Hartert give measurements of a series of adult males as fol- 

 lows: Wing, 71.00-73.00; culmen, 16.00; depth of billat base, 9.60-10.00; tarsus, 26.00;, 

 middle toe, 15.00. 



