1917.] Chapman, Distribution of Bird-life in Colombia. 343 



Malacoptila mystacalis Hellm., P. Z. S., 1911, p. 1197 (Loma Hermosa; Siat6 

 near Pueblo Rico); Allen, Bull. A. M. N. H., XIII, 1900, p. 134 (Valparaiso; Las 

 Nubes; Santa Marta). 



Inhabits the Subtropical Zone of all three ranges. I can detect no dif- 

 ferences between our specimens and a large series from the Santa Marta 

 Mts. 



No vita Trail, 1 ; La Frijolera, 1 ; Salento, 3; about 20 miles w. of Honda, 

 alt. 5000 ft., 1; Anolaima, 1. 



(1637) Malacoptila panamensis poliopis Sel. 

 Malacoptila poliopis ScL., P. Z. S., 1862, p. 86, pi. viii (Esmeraldas, Ecuador). 



Inhabits the Tropical Zone of the Pacific coast, north at least to Cisneros. 

 Comparison of nine males and six females of true poliopis from western 

 Ecuador (including four males from Esmeraldas) with four males and eight 

 females from Panama and Costa Rica, shows that the former differ from the 

 latter mainly, if not solely, in the deeper color of the breast. In the male 

 this is cinnamon-rufous in poliopis, and ochraceous-tawny in panamensis. 

 In the female of poliopis the breast is slightly deeper than in the male of 

 panamensis while the female of panamensis has the breast ochraceous-buff . 



Having thus determined the differentiating characters of these two 

 forms, I have attempted to identify our ten males and five females from 

 western Colombia. As might be expected, they show every stage of inter- 

 gradation between the two extremes. Some specimens could be referred 

 to one form as well as to the other, but on the whole specimens from north 

 of San Jose are nearer to panamensis than to poliopis. Most of them are 

 quite typical of the northern race, while a female from Los Cisneros is equally 

 typical of poliopis. 



Los Cisneros, 1; Barbacoas, 6. 



(1637a) Malacoptila panamensis panamensis Lafr. 



Malacoptila panamensis Lafh., 'Rev. Zool., 184:7, p. 79 (Panama); Cass., Proc. 

 Acad. N. S. Phila., 1860, p. 134 (R. Truando); Scl. & Salv., P. Z. S.,.1879, p. 536 

 (Remedios). 



Malacoptila panamensis poliopis Hellm., P. Z. S., 1911, p. 1196 (Sipi; N6vita; 

 El Tigre; Condoto). 



As remarked under the preceding form, specimens from north of Cis- 

 neros are as a whole nearer to panamensis than to poliopis, though it is 

 evident that the two completely merge in western Colombia. 



Choc6, 1; Baudo, 1; Novita, 2; Dabeiba, 1; Alto Bonito, 2; Puerto 

 Valdivia, 4. 



