374 Annals of the Carnegie Museum. 



Second, the Panama birds, allowing for their state of plumage, agree 

 best with the specimens from the north Colombian coast in having 

 the abdomen brighter, purer yellow than the Cayenne birds, the breast 

 and sides paler green, and the throat rather whiter, less grayish; the 

 back is a little brighter green, and the sides of the pileum more dis- 

 tinctly grayish. There is thus no other course open except to recog- 

 nize panamcnsis, and to place reguloidcs as a synonym of elatus. The 

 question of the distribution of the races of this species is thus con- 

 siderably simplified. 



This appears to be a Tropical Zone form, evidently restricted to 

 the lowlands, and very rare. Mr. Smith took two at Bonda, and the 

 writer one each at the three localities listed above. 



335. Serpophaga cinerea cana Bangs. 



Serpophaga cinerea grisea (not of Lawrence) Bangs, Proc. Biol. Soc. Wash- 

 ington, XIII, 1899, 97 (Chirua, San Miguel, and La Concepcion; crit.). — 

 Allen, Bull. Am. Mus. Nat. Hist., XIII, 1900, 149 (Bangs' reference). 



Serpophaga grisea Sharpe, Hand-List Birds, III, 1901, 112 ("Santa Marta," 

 in range). 



Serpophaga cinerea cana Bangs, Proc. Biol. Soc. Washington, XVII, i9°4» 

 113 (Chirua [type-locality], La Concepcion, and San Miguel; orig. descr. ; 

 type now in coll. Mus. Comp. Zool.). — Allen, Bull. Am., Mus. Nat. Hist., 

 XXI, 1905, 278 (ref. orig. descr.; syn.). — von Berlepsch, Ornis, XIV, 

 1907, 488' (ref. orig. descr.). — Ridgway, Bull. U. S. Nat. Mus., No. 50, IV, 

 1 9°7, 397 (diag- ; range; references). 



Serpophaga cana Brabourne and Chubb, Birds S. Am., I, 1912, 282 (ref 

 orig. descr.; range). 



This is one of the species of which Mr. Carriker failed to secure 

 specimens in the Santa Marta region, although an ample series is 

 available from Venezuela and other parts of Colombia, and Mr. Bangs 

 has very courteously loaned his type-series for use in this connection. 

 Comparison with birds from Panama and Costa Rica shows that the 

 difference in general coloration, on which reliance has mainly been 

 placed in discriminating cana and grisea, is practically a negligible 

 quantity, and is certainly of no diagnostic value. The slight differ- 

 ence in average size is scarcely worthy of mention, either. In fact, 

 the only difference of any account lies in the color of the wing-bands 

 and external margins of the inner secondaries, which are whiter and 

 broader, and therefore more conspicuous, in cana than in grisea. It 

 has not been possible as yet to compare either of these with true 

 cinerea. 



