216 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



cc. Pileum olive-green or grayish olive, not distinctly, if at all, different from 

 color of back. 

 d. Under parts of body distinctly yellowish. 

 e. Brighter olive-green above; under parts clear naples or canary yellow, 

 becoming pale grayish or grayish yellow on throat. (Isthmus of 



Panama, north to Veragua. ) Pachysylvia viridiflava (p. 221) 



ee. Duller olive-green above, the pileum 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 Uraba.). -Pachysylvia flavipes (extralimital)" 

 dd. I'uder parts 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. ) Pachyaylvia griseipea (extralimital) b 



ee. Under parts dull pale grayish olive, becoming whitish on abdomen, the 

 sides and flanks tinged with light olive-green. 

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



Pachysylvia acuticauda (extralimital) c 



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



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



PACHYSYLVIA DECURTATA (Bonaparte). 

 GRAY-HEABED PACHYSYLVIA, 



Adults {sexes alike). — Pileum and hindneck plain gray (mouse gray 

 or deep smoke gray to slate-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 white; auricular region 

 and sides of neck pale buffy gray, the suborbital 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 Hylophilus flavipes Lafresnaye, Eev. Zool., 1845, 342; Baird, Review Am. Birds, 

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



b Hylophilus griseipes Richmond, Proc. U. S. Nat. Mus., xviii, no. 1093, Aug. 12, 

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



<^ Hylophilus acuticauda 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, 166, 170 (Caracas, Venezuela; crit. ). — Hylophilus acutieaudus 

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

 Sclater, Ibis, 1881, 304 (crit.). — Hylophilus flavipes acuticauda Berlepsch and Hartert, 

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

 crit.). — 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. 



^Hylophilus 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, 379. — Hylophilus aurantiifrons Gadow, Cat. Birds Brit. Mus., viii, 1883, 

 310, part. 



