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



I detect no constant difference in color between our twenty-one west 

 Colombian specimens, and five from La Morelia and Florencia in the Ca- 

 queta region; in the latter the rufous areas average darker, the rectrices 

 basally greener, and as a rule, the rufous extends somewhat farther on to 

 the abdominal region which is less tiaged with blue. The main difference 

 between the two series, however, is to be found in the central tail-feathers 

 which, in the adult, appear usually to have racket-shaped tips in semirufa 

 and to have their vanes entire in martii. Thus, out of twenty adults of 

 semirufa, only one has the central tail-feathers non-spatulate ; while none 

 of our five specimens of martii has the racket-shaped tips on the central 

 feathers. 



These observations confirm those already made by Hellmayr (Nov. 

 Zool., 1907, p. 403) who states that in five specimens from the upper Ama- 

 zon the tail is not spatulated while " in a large series of TJ. m. semirufa from 

 Bogota collections, western Ecuador, Costa Rica, etc., the tail-feathers are 

 nearly uniform blue and the middle pair invariably spatulated in the adults." 



It is important to observe that so far as our specimens go, the central 

 rectrices in martii do not show that breaking down in the barbs at their 

 attachment to the shaft, which is evident in the central tail-feathers of 

 semirufa along that portion of the shaft which is in process of losing its barbs. 



Alto Bonito, 1 ; Baudo, 2; Juntas de Tamand, 5; Barbacoas, 6; Puerto 

 Valdivia, 2; Honda and vicinity. 5. 



(906) Electron platyrhynchus platyrhynchus (Leadb.). 



Momotus platyrhynchus Leadb., Trans, Linn. Soc, XVI, 1833, p. 92 ("Brazil" = 

 w. Ecuador). Cf. Hakt., Nov. Zool., 1898, p. 497; Hellm., lUd. 1907, p. 404. 



Crypticus platyrhynchus Cass., Proc. Acad. N. S. Phila., 1860, p. 136 (R. Nercua). 



Inhabits the Tropical Zone of western Ecuador northward to the Atrato 

 Valley in Colombia. I have seen no Ecuador specimens but, although 

 showing to a limited extent the decrease in size which occurs in this species, 

 as one advances toward the northern limit of its range, it seems evident that 

 the long-tailed, large-billed form of extreme western Colombia is referable 

 to that form. 



Five specimens from Puerto Valdivia, in the lower Cauca, however, as 

 the appended table of measurements shows, are clearly intermediate be- 

 tween platyrhynchus and minor. 



I follow Hellmayr (1. c.) in restricting the name platyrhynchus to the 

 Pacific coast form. The fact that this species was not definitely recorded 

 from Brazil until 1906 (Hellmayr, I. c), in connection with the fact that it 



