216 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



re. Pileuoi olive-jireeii or irniyii^li olive, not distinctly, if at all, <Ufferent frftiii 

 color of back. 

 d. Under parts of body distinctly yellowish. 



e. Brighter olive-green above; nnder [>arts clear naples (jr canary yellow, 

 becoming pale grayish or grayish y(>ll<)w on throat. (Isthmus of 



Panama, north to Veragua. ) Pachysylvia viridiflava (]>. 221 ) 



ee. Duller olive-green above, the pilcum and back grayish, rather than 

 greenish, olive; under parts very pale buffy yellowish, becoming pale 

 grayish buffy on chest, the throat dull whitish. (Coast district of 

 Colombia, east of Gulf of rral)a. ). .Pachysylvia flavipes (extralimital)" 

 (Id. Under i)arts of body not distinctly yellowish (only the under tail-coverts, 

 under wing-coverts, and inner edges of remiges yellow) . 

 e. Under parts dull buffy whitish, becoming more grayish on throat, the 

 sides and flanks tinged with olive-yellow. (Margarita Island, Venez- 

 uela. ) Pachysylvia griseipes (extralimital) '' 



e.c. Under parts ilull i)ale grayish olive, becoming whitish on abdomen, the 

 sides and flanks tinged with light olive-green. 

 f. Smaller (wing 49, tail 45, exposed culmen 10.5, tarsus 17). (Venezuela. ) 



Pachysylvia acuticauda (extralimital)'' 



ff. Larger (wing 61-63, tail 46, exposed culmen 12-13, tarsus 19-20). 



(Island of Tobago. ) Pachysylvia insularis (extralimital )'' 



PACHYSYLVIA DECURTATA (Bonaparte). 

 GRAY-HEADED PACHYSYLVIA. 



Adults [sexes alili-e). — Pileum and hindiieck plain gray (mouse gray 

 or deep smoke gray to si ate -gray); rest of upper parts plain yellowish 

 olive-green; narrow and rather indistinct supraloral streak and eye- 

 lids dull white; lores pale gray or grayish Avhite: auricular region 

 and sides of neck pale buffy gray, the suborljital and malar regions 

 paler; chin and throat dull white or grayish white; median portion of 

 chest and breast, together with abdomen, white or yellowish white, 

 the first sometimes tinged with olive-yellow; sides and flanks light 



(I HylophU us flavipes Lafresnaye, Rev. Zool., 1845, 342; Baird, Review Am. Birds, 

 1865, 375; Sclater, Ibis, 1881, 309; Gadow, Cat. Birds Brit. Mus., viii, 1883, 312, part. 



^^ ITylopUlua griseipes Richmond, Proc. U. S. Nat. Mus., xviii, no. 1093, Aug. 12, 

 1896, 678 (Margarita Island, Venezuela; coll. U. S. Nat. Mus.). 



<'IIljlophilus acvticauda Lawrence, Proc. Ac. Nat. Sci. Phila., 1865, 37 (Venezuela; 

 coll. G. N. Lawrence); Baird, Review Am. Birds, 1866, 378; Sclater and Salvin, Proc. 

 Zool. Soc. Lond., 1868, 1(56, 170 (Caracas, Venezuela; crit. ). — Hylophilm acuticaudns 

 Sclater and Salvin, Proc. Zool. Soc. Lond., 1869, 252 (Plain of Valencia, Venezuela); 

 Sclater, Ibis, 1881, 304 (crit.) .—Ilylopliilas flanpes aruticanda Berlepsch and Hartert, 

 Novit. Zool., ix, Apr., 1902, 12 (Altagracia, Caicara, and Ciudad Bolivar, Venezuela; 

 cut.). —Hylophilus aurantiifrons Gadow, Cat. Birds Brit. Mus., viii, 1883, 310, part. 



This species is evidently the mainland representative of P. insularis, from which 

 it differs only in size, the coloration being identical. The type is certainly not. a 

 young bird, as suggested by Sclater, and it is equally certain that the form is entirely 

 distinct from P. aurantiifrons. 



(1 HylopMlus insularis Sclater, Proc. Zool. Soc. Lond., 1861, 128 (Tobago; coll. P. L. 

 Sclater); Cat. Am. Birds, 1862, 45; Ibis, 1881, 305 (monogr.); Baird, Review Am. 

 Birds, 1865, 37^).—HyJnphiltis aurantiifrons Gadow, Cat. Birds Brit. Mus., viii, 1883, 

 310, part. 



