1917.] Chapman, Distribution of Bird-life in Colombia. 435 



collected by Galbraith on the line of the Panama Railroad. Furthermore, 

 we have a specimen of R. marginatus from Novita, in the same faunal region 

 as Jimenez (alt. 1600 ft.) whence came two of Bangs' specimens of asemus} 



The two groups are distinguished chiefly by the yellowish breast and 

 throat and greenish head of sulphur escens, and grayish breast, throat and 

 head of cinerciccps. Apparently cinereiceps does not intergrade with mar- 

 ginatus since five Costa Rican specimens show no approach to our two speci- 

 mens of marginatus from Panama. 



Dabeiba, 1; Puerto Valdi via, 1 (int.); Rio Frio, 1; Call, 1; Miraflores, 1. 



(2759) Rhynchocyclus sulphurescens assimilis Pelz. 



Rhynchocyclus assimilis Pelz., Orn. Bras., 1869, p. 110 (Borba, Brazil, fide 

 Hellmayr in litt.). 



Four specimens from Villavicencio and Buena Vista, in the Tropical 

 Zone at the eastern base of the Eastern Andes, are brighter green above 

 and somewhat yellower below than a specimen from Florencia and another 

 from Mt. Duida, near the headwaters of the Orinoco, but in other respects, 

 including the well-developed gray crown, which chiefly distinguishes them, 

 these birds all agree. 



Dr. Hellmayr writes me that in his forthcoming paper on the genus 

 Rhynchocyclus he will show that the type-locality of assimilis is Borba on 

 the Madeira. Possibly therefore five specimens from the headwaters of 

 the Rio Roosevelt may be considered as fairly topotypical of that race. All 

 have the gray crown but they are brighter than the Colombian birds and 

 have the wing-quills and particularly coverts more widely margined with, 

 greenish yellow. No doubt the Colombian bird is separable but such sepa- 

 ration to be satisfactory requires a more thorough study of the group than 

 my material permits. 



Villavicencio, 2; Buena Vista, 2; Florencia,!. 



(2760) Rhynchocyclus sulphurescens exortivus Bangs. 



Rhynchocyclus sulphurescens exortivus Bangs, Proc. Biol. Soo. Wash., XXI, 1908, 

 p. 163 (La Conoepcion, Santa Marta). 



Rhynchocyclus sulphurescens Allen, Bull. A. M. N. H., XIII, 1900, p. 146 (Min- 

 oa; Bonda). 



Specimens from the Magdalena and lower Cauca valleys are intermedi- 

 ate between exortivus and asemus. Thus one from Opon on the lower Mag- 



^ Since writing the above, Miller and Boyle send specimens of both sulphurescens asemus and mor- 

 gina'us from Puerto Valdivia. 



