580 



BIRDS OF THE GALAPAGOS ARCHIPELAGO— BIDG WAT. vol.xix. 



Jiiue 17. Forehead and broad sui)erciliary stripe, extending from nos- 

 trils to occiput, ocbraceous-bult" ; rest of pileum nearly same color, but 

 broadly streaked with deep hair brown, these streaks so broad on hind 

 part of ci'own as to nearly conceal the bufty edgings. Ear coverts, hind 

 neck, back, scapulars, and lesser wing coverts uniform hair browu, the 

 rump, upper tail-coverts, and broad tips of greater and middle wing- 

 coverts paler and tinged with butty; secondaries edged for terminal 

 half with pale butty grayish, and broadly margined at tips with butty 

 grayish white. Malar region, chin, and throat pale buft\ deeper lat- 

 erally; rest of under parts deep butt', becoming rather clearer and 

 brighter posteriorly, and everywhere devoid of the least trace of 

 streaks. Length (skin), 4.25; wing, 2.21; tail, 1.88; exposed culmen, 

 0.38; tarsus, 0.05; middle toe, 0.32. 



Immature male. — No. 123, collection of Dr. G. Baur; Chatham Island, 

 June 25. Much like the adult female, as described above, but top of 

 head nearly uniform grayish brown, like back, though showing indis- 

 tinctly defined broad streaks of darker and lighter, with a few concealed 

 bright yellow spots on center of crown; anterior part of forehead and 

 superciliary stripe, however, deep bufify, as in the female; buff of under 

 parts deeper and yellower. Length (skin), 4.25; wing, 2.30; tail, 1.92; 

 exposed culmen, 0.30; tarsus, 0.63; middle toe, 0.38. 



The adult male described is the brightest colored one in a series of 

 eight, the remainder being more or less paler scarlet beneath. This 

 conspicuous diiference of intensity betw'een the red of the pileum (which 

 is exactly as in other forms) and that of the lower parts is, next to the 

 small size, the most striking character of the present form. 



Two other females in Dr. Baur's collection differ from that described 

 in having an appreciable (though in case of one very faint) yellow tinge 

 to the posterior under parts. 



Another immature male, also in Dr. Baur's collection, is quite 

 decidedly yellowish on the posterior lower parts, the under tail-cov- 

 erts and malar region being nearly maize yellow. 



There can be little doubt, I think, that Gould's PyrocephalHS (luhins 

 was based on a female or immature male of this form, but the question 

 can be determined positively only by examination of the type, now in 

 the British ]\Iuseum, The original description certainly fits the female 

 very well, and the measurements of the type, recently made for me by 

 Dr. Sclater, indicate a very small bird; smaller, in fact, than the small- 

 est in the series of sixteen specimens from Chatham Island. 



Some of Dr. Sclater's measurements are materially different from 



those given by (iould, as the following will show. For convenience of 



comparison, the fractions of the latter are changed from duodecimals 



to decimals: 



Measurements of Pyrocephalus ditbius. 



Authority. 



Wing. 



Gould 



Sclater 



Smallest female from Chat- 

 bam Islaud. 



2.26 

 2.15 

 2.20 



Tail. 



1.77 

 1,60 

 1.80 



Exposed T 

 culmeu. 



0.40 

 .45 



0.60 

 .60 

 .62 



Specimen. 



JType of P. dubius, Gould. 

 No. 125989, U.S.N.M. 



