90 Proceedings of the Biological Society of Washington. 



Of this apparently new species only a single specimen has been received. 

 It differs very decidedly from Poospiza torquata (D'Orbigny and Lafresnaye) 

 in its shorter, relatively stouter bill, much broader black pectoral collar, 

 much wider and more whitish outer margins to the tertiaries, and in par- 

 ticular by having much more white on the tail, this color on the outer rec- 

 trix reaching nearly to the base of the feather, and cut off obliquely, not 

 almost straight across on the inner web, as in torquata. The middle rec- 

 trices are grayish, duller than the back, not dusky black. 



Type, No. 43,650, Collection Carnegie Museum, adult male; Guanacos, 

 Prov. Cordillera, Bolivia, August 21, 1909; Jos6 Steinbach. 



Arremon aurantiirostris strictocollaris, subsp. nov. 



Similar to Arremon aurantiirostris aurantiirostris Lafresnaye of Panama 

 and the Pacific slope of Costa Rica, but averaging slightly brighter, more 

 yellowish green above; black pectoral band narrower; under parts more 

 extensively white; and the sides, flanks, and crissum paler. 



Four adult males from eastern Panama in the collection of the Ameri- 

 can Museum of Natural History agree with the type in the above characters 

 as compared with a series of true aurantiirostris, and evidently represent 

 a form which in some respects approaches A. spectabilis occidentalis Hell- 

 mayr, without, however, any indication of intergrading with that form. 



Type, No. 63,859, Collection Carnegie Museum, adult male; Sautata, 

 Rio Atrato, Colombia, January 22, 1918; M. A. Carriker, Jr. 



Sicalis luteiventris flavissima, subsp. nov. 



Similar to Sicalis luteiventris minor Cabanis of British Guiana, but larger, 

 with conspicuously heavier bill, and with the upper parts more broadly 

 streaked. SimUar also to *S. luteiventris luteiventris (Meyen), but under 

 parts more richly and more uniformly yellow, especially posteriorly. 

 Wing (type), 69; tail, 49; bill, 10.5; tarsus, 17. 



This is apparently the Sicalis chapmani of Hellmayr, Nov. Zool., XV, 

 1908, 34, from the islands of Marajo and Mexiana, but not the S. chapmani 

 of Ridgway, from which the new form differs decidedly in being less greenish 

 yellow above, with the dusky streaks much broader, and slightly duller 

 yellow below. The sides of the head, the breast, and the sides in the male 

 are shaded with yellowish olive, instead of being plain yellow, as in chap- 

 mani, and the female has a distinctly yellow throat, as in luteiventris, so 

 that I would range it with this latter form, and not with chapmani, in which 

 the female has a whitish throat. 



Sicalis "arvensis" is in all probability a synonym of S. luteiventris, and 

 in any case the latter name has a year's priority over the former as the 

 specific designation of this group. 



Type, No. 68,308, Collection Carnegie Museum, adult male; Rocana, 

 Pard,, North Brazil; May 13, 1918; Samuel M. Klages. 



Sporophila americana dispar, subsp. nov. 



Similar to Sporophila americana americana (Gmelin) of French Guiana, 

 but size constantly larger; white alar spot in the male averaging larger, 

 and rump more conspicuously mottled with white (not grayish) ; female also 



