( 297 ) 
of a rather purer grass-green; throat, chest, and sides decidedly washed with 
greenish. ; 
Wing 56, 584 ; tail 45, 475 mm. 
Examined: one & ad. from Pebas (type) in the British Museum; one adult, 
Rio Napo, in the Tring, and two adult males, La Merced, C. Pern, in the Branicki 
Museum. 
Obs. The two last-named skins are larger (wing 604, 634 ; tail 49, 53 mm.), 
and may again be different. The Napo bird is practically identical with the type. 
113. Rhynchocyclus sulphurescens assimilis Pelz. 
[Platyrhynchus sulphurescens Spix, Av. Bras. ii. p. 10. pl. xii. fig. 1 (‘go ”) (1825.—Rio de 
Janeiro, etc.).] 
Rhynchocyclus assimilis Pelzeln, Zur Ornith. Bras, ii. pp. 110, 181 (1868.—Engenho do Gama, Rio 
Guaporé ; Borba, Ric Madeira ; Rio Negro, Barra (= Manaos).* 
Nos. 98, 354. od ad., Calama, 23. vi. 8. viii. 1907—Wing 70, 71; tail 
57, 60; bill 13 mm. 
Nos, 217, 332. 22 ad., Calama, 13. vii, 5. viii. 1907.—Wing 63, 6t; tail 
50, 51; bill 12 mm. | 
No. 185. juv., Calama, 7. vii. 1907.—Wing 61; tail 49 ; bill 12 mm. 
Nos. 930, 1045. oo ad., Maruins, 14. vi., 21. vii. 1908 —Wing 68, 69 ; tail 56; 
bill 13 mm. 
“Tris brown, feet and bill black, lower mandible greyish.” 
The series agrees with Natterer’s typical specimens in the Vienna Maseum. 
R. s. assimilis, from the Rio Negro and the Madeira district, differs from R. s. 
sulphurescens, of South-Eastern Brazil, by its much duller, less yellowish green 
back, and by having the pileum nearly uniform slate-grey, with scarcely any 
greenish admixture. The other characters—viz. smaller size, paler yellow wing- 
markings and under parts, etc.—however, do not hold good. 
Examples from Northern Pera (Huambo, Xeberos, Chamicuros) agree with 
assimilis in the coloration of the cap, but the back is bright olive-green, even 
brighter than in sulphurescens. I take them to beloag to KR. sulphurescens 
peruvianus Tacz.,¢ though 1 have not yet examined skins from the type locality. 
114. Rhynchocyclus poliocephalus sclateri Hellm. 
Rhynchocyclus poliocepralus sclateri Hellmayr, Verhandl, Zool. Bot. Gesellsch, Wien liii, p. 207 
(1903.—Barra do Rio Negro). 
No. 396. 9 ad. (in worn plumage), Calama, 15. viii. 1907.—“ Iris yellowish 
grey, feet and bill black.” —Wing 54; tail — ; bill 11 mm. 
Agreeing with the type and other specimens from Guiana, Bahia, Rio Negro, etc. 
This is the R. megacephalus of Sclater & Salvin, but not of Swainson, ¢ as I have 
pointed out in another paper.§ It is closely allied to R. poliocephalus Tacz., from 
Upper Amazonia, in fact its eastern representative. In the following lines I give 
a short summary of their characters and geographical distribution, together with 
the principal synonymy :— 
* There are no specimens from 8. Vicente, also mentioned by Pelzeln, in the Vienna Museum. 
+ Rhynchocyclus peruvianus Taczanowski, Proc. Zool. Soc. Lond. 1874. p. 537 (Ropaybamba, Centra 
Peru). 
t Tyrannula megacephala Swainson, Birds Brazil pl. 47. 
§ Verhandl. Zool. Bot. Geselisch. Wien liii. 1903. pp. 205-7. 
