1917.] Chapman, Distribution of Bird-life in Colombia. 579 



I have but one specimen from Zamora. It is matched by others from 

 Zaruma and Duran, Prov. Guayas; while specimens from Esmeraldas in the 

 humid coast region of northwestern Ecuador, and from southwestern Colom- 

 bia, are nearer columbiana. They are smaller than specimens from the 

 Bogota region, and in this respect agree with Dabeiba birds, and may have 

 the flanks a trifle more olivaceous and the underparts a shade deeper, but 

 above they match true columbianus exactly. 



Dabeiba, 6; Alto Bonito, 1; Peque, 2; Xumaco, 2; Buena Vista, 1; 

 Ricaurte, 1; Honda, 4; Chicoral, 1; La Candela, 1; near San Agustin, 3; 

 Andalucia, 2; El Alto de la Paz, 2; Buena Vista, 3; Villavicencio, 2. 



(4020a) Coereba mexicana caucae Chapm. 



Cosreba mexicana caucce Chapm., Bull.. A. M. N. H., XXXIII, 1914, p. 186 (Call, 

 Colombia). 



Char, subsp. — Similar to Coereba mexicana columbiana (Cab.) but slightly smaller, 

 the superciliaries mixed with grayish, sides of the throat, and sometimes its center, 

 finely barred with grayish. Five males: Wing, 56.5; tail, 33.5; five"females, wing, 

 53; tail, 32 mm. 



This unexpected, but apparently quite distinct form is based on eleven 

 adults from the Cauca Valley and adjoining slopes of the Western and Cen- 

 tral Andes. The unusual characters in adults of this group, of a grayish 

 superciliary line and barred sides of the throat, are present in all our speci- 

 mens. At first glance these markings suggest immaturity, but the birds 

 showing them are unquestionably- fully adult. 



Cali, 7; Las Lomitas, 2; e. of Palmira, 1; San Antonio, I; Rio Frio, 1. 



(4027a) Diglossa sittoides similis (Lafr.). 



Dliglossa] similis Lafk., Rev. Zool., 1846, 318 ('Bogotd). 

 Diglossa sittoides, ScL. & Salv., P. Z. S., 1879, p. 496 (Retiro; Concordia). 

 Diglossa sittoides similis Allen, Bull. A. M. N. H., XIII, 1900, p. 174 (San 

 Miguel; San Sebastian; El Mamon). 



Not uncommon in the Subtropical Zone of all three Ranges. Comparison 

 of eight males from Colombia, and two from Merida, Venezuela, with two 

 from Aplobamba, Bolivia, which may be considered as typical of true sit- 

 toides, supports the characters attributed by Lafresnaye to the 'Bogota' 

 bird. The northern form is smaller with an actually stouter bill, and has 

 the sides and front of the head noticeably darker, the underparts of a more 

 cinnamon less ochraceous shade than in the Bolivian race. Specimens from 

 ' Ambato' and 'Quito,' Ecuador, resemble the Bolivian form in color but are 

 nearer the Colombian in size. 



