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



dalena is nearer the former while another from Chicoral in the more arid 

 region above Honda is nearer the latter. Specimens from Malena and 

 Puerto Valdivia have the crown grayish, but the throat yellowish and might 

 be referred to either form. On purely faunal grounds I therefore place the 

 Magdalena Valley bird under exortivus, the Puerto Valdivia one with asemus. 

 Opon, 1; Malena, 1; Chicoral, 1. 



(2764a) Rhynchocyclus marginatus marginatus Lawr. 



Rhynchocydus marginatus Laws., Proc. Acad. N. S. Phila., 1868, p. 429 (Panama, 

 Lion HUl). 



Rhynchocydus cinereiceps flavotectus Hellm., P. Z. S., 1911, p. 1126 (N6vita; 

 Noanamd). 



Allowing for a very slight difference possibly due to the fading in the 

 older specimen, specimens from western Colombia agree with the type of 

 R. marginatus Lawr., from the line of the Panama R. R. While its gray 

 head and grayish breast indicate that marginatus is apparently a repre- 

 sentative of cinereiceps, it seems not to intergrade with that species (Ridgw., 

 Bull. 50, IV, p. 392). As in some other instances, forms of Guianan and 

 Ecuadorian origin evidently meet at Panama in Rhynchocyclus sulphures- 

 cens fiavo-olivaceus on the one hand and R. m. marginatus on the other. 



A specimen from Barbacoas and another from Buenavista, Narifio, 

 closely resemble the type and cotype of R. marginatus from Panama, from 

 which they differ only in being slightly darker above and in having the edg- 

 ing to the wing-coverts more ochraceous in tone. The first-named dif- 

 ference is doubtless due to the fading of the types, while the second is 

 seasonal since it is shown by a specimen from Puerto Valdivia which, in 

 the color of the wing-coverts as well as in other respects, agrees with the 

 birds from Barbacoas and Buenavista. 



A specimen from Esmeraldas and three from Guayaquil agree and differ 

 from marginatus in having the crown grayer with no admixture of green, the 

 throat and breast yellower, with grayish only on the chin, the wing-coverts 

 less widely margined. They evidently are racially different from the Barba- 

 coas, Buenavista and other Colombian specimens and possibly may repre- 

 sent yZawfeciMS Hart. (Nov. Zool., IX, p. 608, San Javier, n. w. Ecuador). 



Puerto Valdivia, 1; No vita, 1; Barbacoas, 1; Buenavista, Narifio, 1. 



(2768) Rhynchocyclus viridiceps Scl. & Sah. 



Rhynchocyclus viridiceps Scl. & Salv., P. Z. S., 1873, p. 280 (Pebas, Peru). 



A single specimen froni Florencia extends the known range of this species 

 northward from Peru. I have, however, no Peruvian specimens for com- 



