658 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Type.— No. 134533, Am. Mus. Nat. Hist., o’ ad., Alto Bonito, R. Sucio, Chocé, 
Colombia, Feb. 17, 1915; Miller and Boyle. 
Range.— Tropical Zone of the Pacific coast of Colombia from at least the Rio 
Salaqui southward into Ecuador, eastward into Antioquia. 
Remarks.— Pacific coast specimens of Cacicus uropygialis have hereto- 
fore been referred to the ‘Bogotaé’ form, C. u. uwropygialis Lafr.1 Reterence, 
however, to the appended measurements show that they have the wing 
about 20 millimetres, the tail 35 millimetres shorter than in specimens from 
the Eastern Andes, while the tarsus and bill are proportionately smaller. 
Specimens from Puerto Valdivia (alt. 360 ft.) on the lower Cauca show 
a slight approach in their longer tail to wropygialis but are still obviously 
referable to pacificus. Cauca Valley specimens as clearly represent the 
East Andean form. While “Los Tambos” and “ Rio Lima,” whence Batty 
secured the specimens listed in the accompanying table, are known to be 
in the vicinity of Cali, Batty’s headquarters; their altitude is not stated. 
A juvenal female from Salento, having the tail 107 mm. in length, definitely 
establishes the occurrence of wropygialis at an altitude of 6500 feet, while 
two specimens from the west slope of the eastern Andes below Andalucia 
at an altitude of 5000 feet, suggest that it inhabits the Subtropical Zone. 
From Cacicus uropygialis microrhynchus the proposed new form may at 
once be distinguished by its heavier bill, of which the culmen averages 
about 2 mm. wider basally. The gonydeal angle is broader, more obtuse, 
while the base of the mandible is much swollen. Many specimens, when 
seen from below, appear to have an enlargement laid on the sides of the base 
of the mandible from which it is raised by a ridge-like process. 
In a specimen from Salaqui this growth is fully developed and the bird 
shows no sign of intergradation with microrhynchus. In others it is less 
prominent and it seems probable that the large and small-billed forms 
merge somewhere between the Canal Zone and the Colombian boundary. 
Measurements of Males. 
Name Place Wing Tail Tarsus Culmen 
C. u. pacificus i. Salagai, Col: 132°5 93.5 28 30 
A a eae Alto Bonito, “ 140 95.5 29.5 31 
“ “ “ 66 44 136 90 IS, 29 
ite ‘i 7 2 132 94 29 .5 31 
eee s Baudo, i 130.5 92 29 30 
ie e Mi . 138 96 28 .5 28 
peat , Barbacoas, % 141 96 29 ae 
ry oe - Eismeraldas, Ee. 132 92 29.5 30.5 
LCi Bellmayr, Zs Si) 191d, Holder: 
