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



posed separation of the west Colombian bird (l. c.) was not warranted by 

 the facts in the case. 



La Frijolera, 1; Salencio, 1; Las Lomitas, 2; San Antonio, 1; Cerro 

 Munchique, 1; Gallera, 1; Miraflores, 2. 



(2487a) Xenicopsis subalaris mentalis {Tacz. & Berl.). 

 Anabazenops mentalis Tacz. & Berl., P. Z. S., 1885, p. 96 (Machay, e. Ecuador). 



Three specimens from the Subtropical Zone above the Magdalena 

 Valley and one from Buena Vista appear to be referable to this form to 

 which H'ellmayr (P. Z. S., 1911, p. 1151) refers Bogota specimens. The 

 intermediate characters shown by one of the La Candela examples indicate 

 the probability of complete intergradation with true subalaris. From that 

 form mentalis may be known by its blacker head, darker, more olivaceous 

 back, the generally broader shaft-streaks of the upperparts which extend 

 well down the back, while the streaks on the underparts reach posteriorly ^ 

 to the ventral region. 



La Candela, 2; Fusugasuga, 1; Buena Vista, 1. 



(2490) Xenops genibarbis littoralis Sal. 



Xenopa littoralis Sol., P. Z. S., 1861, p. 379 (Esmeraldas, Ecuador). 

 Xenops genibarbis Sol. & Salv., P. Z. S., 1879, p. 523 (Remedios). 

 Xenops genibarbis littoralis Hellm., P. Z. S., 1911, p. 1152 (Noanamd; Tad6). 



Inhabits the Tropical Zone of the Pacific coast eastward through An- 

 tioquia to the Magdalena Valley and up the Cauca to the Cauca Valley. 

 The Malena specimen agrees with west Ecuador birds. We have not met 

 with true genibarbis. 



N6vita Trail (4000 ft.), 1; Buenaventura, 1; Barbacoas, 1; Rio Frio, 2; 

 Puerto Valdivia, 2; Malena, 1. 



(2493) Xenops rutilus heterurus Cab. & Hein. 



Xenops heterurus Cab. &. Hein., Mus. Hein., II, 1859, p. 33 (Colombia). 

 Xenops [rutilus Wyatt, Ibis, 1871, p. 331 (Canta); Sol. & Salv., P. Z. S., 1879, 

 p. 522 (Sta. Elena); Allen, Bull. A. M. N. H., XIII, 1900, p. 158 (Las Nubes). 



Inhabits the Subtropical Zone of all three ranges. True rutilus, as 

 represented by a series from Chapada, Matto Grosso, is brighter above, 

 more broadly striped below and has only one pair, iristead of two pairs of 

 rectrices with the inner web largely black (C/. Hellm. Nov. Zool., XV, 1908, 

 p. 62). 



