38 Messrs. Salvin and Sclater 



gutture lactescenti-albo, ventre imo crissoque obscurioribus, 

 nigricantioribus : rostro nigro, pedibus plumbeis : long, 

 tota 4-3, alse 4 6, caudse 2-4, tarsi 0'45. 

 Hab. in Mexico et Guatemala. 



An imperfect specimen from Coban transmitted by Salvin 

 seems to be referable to this species, of which I have taken the 

 characters from two skins obtained by M. H. de Saussure in 

 Mexico. The bird is nearly allied to two South American 

 species, Chatura spiriicaucla and C. poUura, but is immediately 

 distinguishable by its pure white throat, passing into smoky 

 bi'own on the belly. In C. spinicauda the throat is also whitish, 

 but the belly is of a bluish ash-colour, and the uropygium is 

 pale cinereous. In the present bird the uropygium and tail- 

 coverts are of a pale smoky brown, like the belly. 



It is probable that this Swift may be the Cluetura vauxi (Baird, 

 Report, p. 145) of Western North America, of which I have 

 never seen specimens. It seems to agree with the figure of that 

 bird, given in the 10th volume of the Pacific R. R. Reports, 

 pi. 18.— P. L. S. 



Fam. TROCHILID^. 



54. Phaethornis adolphi, Gould: sp. 177. 



This is one of the commonest species of the family about 

 Yzabal, and, I think, one of the most restless and active of them 

 that I have yet met with. It searches the flowers growing from 

 the ground to the height of about four or five feet. 



55. Campylopterus rufus (Less.) : sp. 178. 



I saw only one example of this species at Duenas last year. Now 

 it is abundant in all parts, and instead of being one of the rarest 

 is one of the most familiar species. There seems to be a slight 

 difference in the notes of all the humming-birds that have come 

 under my observation, which is more especially noticeable when 

 several species frequent the same place. The call-note — if such 

 it is — of C. rufus is very distinct from those of Thaumasiura 

 henicura, Amazilia arsinoe, and Cyanomyia cyanocepliala, all of 

 which are in their turn distinguishable one from another; but 

 these differences, perceptible as they are to the ear, are not 

 cajjable of being rendered intelligible in writing. It appears 



