470 Mtscellaneous. 



This movement has received the name of rotation, because the juices 

 appear to turn upon themselves, with more or less regularity, in the 

 interior of each cell. — Comptes Rendus, Sept. 28, 1857, p. 434. 



On a new Genus of Birds from Mexico. By P. L. Sclater, Esq. 

 Camptostoma. 



Genus novum Tyrannidarum, Tyrannulo affine: rostrum altum, 

 breve, valde compressum, apice acuta et dente finali nulla; cul- 

 mine multum arcuato et regulariter incurvo, gonyde paulum 

 ascendente ; vibrissis rictalibus nullis : alee modicce, dimidium 

 caudce attingentes ; primariis secunda, tertia et quarta inter se 

 (jequalibus et quint am paulo excedentibus, sexta his paulo bre- 

 viore sed primam superante : cauda modica quadrata : tarsi 

 breviusculi : pedes ut in genere Tyrannulo. 



C. IMBERBE, Sp. nOV. 



C. supra olivascenti-fuscum, pileo semicristato, cinerascenti-fusco ; 

 alis fuscis , secundariarum et tectricum marginibus externis pal- 

 lidioribus et albicantibus ; cauda pallide cinerascenti-fusco 

 unicolore : subtus cinerascenti-albidum flavo perfusum : rostri 

 nigri mandibula inferiore basi flavicante ; pedibus nigris. 



Long, tota 3'5 ; alee 2*8 ; caudse 1*3. 



Hab. In vicinitate urbis S. Andres Tuxtla in rep. Mexicana. 



M. Salle's recent collections contain a single specimen of this curi- 

 ous little bird, which was obtained in the neighbourhood of S. An- 

 dres Tuxtla. There is no doubt about its belonging to the Tyran- 

 nidee, but the form of the bill appears to be quite different from 

 that of any bird hitherto recognized as of that family, and to require 

 a new generic appellation. I have therefore called it Camptostoma 

 from the arched form of the culmen. The specific name imberbe 

 refers to the entire absence of rictal bristles. I consider Tyrannulus 

 to be perhaps its nearest-allied generic form, from which, however, 

 it may be at once distinguished by the peculiar depth and compres- 

 sion of the bill. Dr. Hartlaub's Ornithion inerme belongs, I suspect, 

 to this same section of Tyrannidce. — Proc, Zool. Soc. July 14, 1857. 



