620 Bulletin American Museum of Natural History. [Vol. XXXVI, 



head of the Subtropical Zone at the head of the Magdalena River region, 

 however, show in their browner underparts an affinity with marginatus 

 though it is not probable that intergradation occurs in this direction. Speci- 

 mens of marginatum from Naranjo, near Guayaquil, indicate that it occupies 

 the entire humid Tropical Zone of Western Ecuador. North of Cocal, 

 southwestern Colombia, it is unknown, nor has any form of this species 

 been found in the Tropical Zone of the Pacific coast of Colombia north of 

 the point mentioned. A specimen from La Frijolera on the western slope 

 of the Central Andes, above the lower Cauca River, is typical of flavigularis. 

 Between the ranges of marginatus and that of its Panama representative, 

 hypophaeus, there appears therefore to be a hiatus. The case is in a large 

 measure paralleled by that of other species, particularly Arremonops coni- 

 rostris. 



' Cocal, 1 ; Ricaurte, 1 ; Buenavista, Narino, 5. 



Li ■ 

 (4400) Chlorospingus semifuscus Scl. & Salv. 



Chlorospingus semifuscus Scl. & Salv., Nomen. Av. Neotr., 1873, p. 157 

 ("Quito"). 



Taken in the Subtropical Zone of the Western Andes. An unsexed, pos- 

 sibly immature specimen from the Novita Trail (7200 ft.) is smaller than 

 either of two from Gualea, Ecuador and has an olive-green band on the 

 breast. The species has not before been recorded from Colombia. 



Novita Trail, 1 ; Cocal (6000 ft.), 4; (4000 ft.), 4. 



(4402) Hemispingus atropileus {Lafr.). 



Arremon atro-pileus Lafh., Rev. Zool., 1842, p. 335 ("Bolivia" = Bogotd). 

 Chlorospingus atripileus Scl. & Salv., P. Z. S., 1879, p. 504 (Medellin; Sta. 

 Elena). 



A species of the Temperate Zone in all three ranges, descending as low 

 as 6000 feet on the western slope of the Western Andes. 



Andes w. of Popayan (10,340 ft.), 1 ; Cocal (6000 ft.), 2; above Salento, 2; 

 Laguneta, 3; Choachi, 1. 



(4406) Hemispingus rubrirostris (Lafr.). 



Arremon rubrirostris Lafr., Rev. ZooL, 1840, p. 227 (Bogota). 

 Chlorospingus rubrirostris Scl. & Salv., P. Z. S., 1879, p. 504 (Sta. Elena). 



Found only in the Temperate Zone and upper part of the Subtropical 

 Zone in all three ranges of the Andes. The El Roble specimen is topo- 



