13. GEOTHLTPIS. 359 



7. Geothlypis poliocephala. (Plate IX. figs. 3, 4.) 



Trichas delafieldi (ner Audiib.), Sclater, P. Z. S. 1856, p. 293. 



Geothlypis Eequinoctialis {tiec Gm.), Scl. S^ Salt: Ibis, 1860, p. 273. 



Geothlypis poliocephala, Baird, Revieio Amer. B. p. 225 (1865) ; 

 Sumichr. Mem. Bod. Soc. N. H. \. p. 546 (1869) ; Salv. Ibis, 1870, 

 p. 114, et 1872, p. 149; Scl. Sf Salv. Nommcl. Av. Neotr. p. 10 

 (1873) ; Baird, Brewer, ^ Ridgiv. Hist. N. Amer. B. i. p. 296 

 (1874) ; La^vr. Mem. Bost. Soc. K H. ii. p. 269 (1874) ; Salv. Sf 

 Godm. Biol. Centr.-Amer., Aves, -. p. 154, pi. 9. fig. 3 (1881). 



Trichas poliocephala, Grai/, Hand-l. B. i. p. 242, no. 3507 (1869). 



Geothlypis poliocephala, var. caninucha, Baird, Breiver, &■ Ridqw. 

 Hist. N. Amer. B. i. p. 296 (1874). 



Geothlypis caninucha, Salv. ^ Godm. Biol. Cintr.-Amer., Aves, i, 

 p. 153, pi. 9. fig. 2 (1881). 



Adult. General colour above dull olive-brown, decidedly brighter 

 towards the rump and upper tail-coverts ; lesse" and median wing- 

 coverts like the back; greater coveits, bastard- wing, primary- 

 coverts, and quills dusky brown, externally edged with olive-yellow, 

 the first primary margined with ashy white ; tail-feathers olive- 

 brown, externally brighter olive ; crown of head and nape dark 

 slaty grey, the base of the forehead, lores, and feathers below the 

 eye, as well as the lower eyelid, black ; upper edge of eyelid white ; 

 ear-coverts slaty grey, washed with olive-yellow on the lower parts ; 

 cheeks and entire under surface of body bright yellow, a little paler 

 on the lower abdomen ; sides of body olive-greenish ; thighs ashy 

 washed with olive ; under tail-coverts bright yellow ; axUlaries and 

 under wing-coverts bright -yellow, the former with white bases ; 

 edge of wing very bright yellow ; quills below dull brown, ashy along 

 the edge of the inner web. Total length 5-3 inches, eulmen 0-55, 

 wing 2-1, tail 2-25, tarsus 0-85. 



The specimen described (Plate IX. fig. 4) appears to have been 

 breeding, from the worn condition of the plumage. A Mexican 

 example (Plate IX. fig. 3) is apparently in winte" plumage, being 

 altogether browner, and having the grey head obscured by brown 

 edges to the feathers underneath ; below, the yellow is much paler, 

 and the fianks clear fulvous-brown, a saffron tinge being distinguish- 

 able on the breast ; the eyelid also is for the most part white. In 

 this stage of plumage the species has been dc3cribed as G. cani- 

 nucha ; but I feel convinced that it is only the winter plumage of 

 G. poliocephala, corresponding to the winter dress of G. trichas, 

 Pigvires of both winter and summer dresT will be found in the 

 Plate, side by side with the head of adult G. trichas in winter 

 plumage, when the latter species also has a ivhite eyelid. 



Adxdt female. Much duller in colour than the adult male. Dingy 

 olive-brown above, the head and nape dusky slaty gre)^ ; lores and 

 a streak below the eye black ; upper and under edge of eyelid dull 

 white ; ear-coverts dull ashy grey, with whitish sliaft-lines ; under 

 surface of body bright yellow on the throat and breast, becoming 

 paler on the abdomen ; the fianks and sides of the body olive-brown. 

 Total length 5 inches, eulmen O'oo, wing 2'lo, tail 2'3, tarsus 0*S5. 

 Hah. Central America, from Mexico to Guatemala and Costa Rica. 



