Cory — The Genus Rhynchocylus. 219 



Rhynchocyclus cinereiceps cinereiceps (Sclater). 



Cyclorhynchus cinereiceps Sclater, Ibis, 1859, p. 443 (Oaxaca, S. Mexico). 



Range: Southern Mexico (in states of Vera Cruz; Oaxaca; Yucatan; 

 Quintana Roo and Chiapas); Guatemala; Honduras; Nicaragua; Costa Rica 

 and Panama. 



Rhynchocyclus cinereiceps asemus (Bangs). 1 



Rhynchocyclus sulphurescens asemus Bangs, Proc. Biol. Soc. Wash , XXII, 

 1910, p. 73 (Pavas, W. Colombia). 



Range: Western Colombia (Pavas; Dabeiba; Puerto Valdivia; Rio Frio; 

 Miraflores; Cali and Jimimez). 



Rhynchocyclus peruvianus peruvianus Taczanowski. 2 



Rhynchocyclus peruvianus Taczanowski, P. Z. S. Lond., 1874, p. 537 



(Ropaybamba, C. Peru). 

 Range: Central and northern Peru (except in extreme northwestern 

 part). 



Rhynchocyclus peruvianus aequatorialis Berlepsch & Taczanowski. 3 



Rhynchocyclus peruvianus subsp. aequatorialis Berlepsch & Taczanowski, 



P. Z. S. Lond., 1883, p. 556 (Chimbo and Guayaquil, W. Ecuador). 

 Range : Western Ecuador and extreme northwestern Peru, near boundary 

 line (Lechugal). 



Rhynchocyclus marginatus marginatus Lawrence. 



Rhynchocyclus marginatus Lawrence, Proc. Acad. Nat. Sci. Phila., 1868 



(1869), p. 429 (Lion Hill, Panama). 

 Range: Eastern Costa Rica (Carrillo; El Hogar); Panama; western Co- 

 lombia (Puerto Valdivia; Barbacoas; Buena Vista; Narino). 



1R. c. asemus is similar to R. c. cinereiceps of Central America, but differs in having the 

 chest more tinged with yellowish and in its larger size (average measurements of wing — 

 asemus about 67 mm., cinereiceps 64}^ mm.). It differs from R. s. exortivus of the Santa 

 Marta region, etc., in its darker and grayer cap; back darker olive green; throat and chest 

 grayer. The wing averages somewhat longer. (Type examined.) This form, to my mind, 

 is clearly a representative of cinereiceps and not closely allied to sulphurescens. The type 

 specimen is by far the largest of any specimens examined (wing 70 mm.), but two examples 

 from Jiminez have the wing 67 mm. and 68 mm. Dr. Chapman, Bull. Amer. Mus. Nat. 

 Hist., XXXVI, 1917, p. 434, calls attention to the smaller size of specimens examined from 

 Dabeiba, Cali, Rio Frio and Miraflores, in which the wing measurements averaged 66.5 mm. 



2 R. p. peruvianus Taczanowski approaches R. c. cinereiceps, but size decidedly larger; 

 back bright olive green; a blackish auricular spot. Type — wing 60; bill 18 mm. I have 

 not seen this form. 



3 .ft. p. cequatorialis is similar to R. p. peruvianus from central Peru, but decidedly smaller 

 and differs in having the back and edges of remiges brighter olive green; yellow area of lower 

 belly more extensive. Type — wing 65; tail 60; bill 18. Hartert & Goodson, Novit. Zool., 

 XXIV, 1917, p. 415, say they examined a specimen from western Ecuador and it differed from 

 R. c. cinereiceps only in its slightly darker gray head and less extended gray throat, and that 

 a Peruvian skin (no definite locality given) labelled R. s. peruvianus did not appear to differ 

 from the Ecuadorian specimen. I have not seen a specimen of this form, but judging from 

 the original description I suspect wquatorialis will be found to be a representative of cinerei- 

 ceps and close to asemus. , 



