Mr. 0. Salvia on the Genus Cinclus. 121 



separating tlicin into races ; nor have I enough specimens satis- 

 factorily to establish the constancy of these characters. I only saw 

 specimens of Dipper in Guatemala which seemed to be the same 

 as the Mexican bird; but, as we find that in almost every in- 

 stance where these birds occupy isolated districts, a slight modi- 

 fication of colour is also observable, I should not be surprised to 

 find that the Guatemalan bird is no exception to the rule, fre- 

 quenting as it does the streams of the highest ridges, 10,000 

 feet above the sea. 



11. Cinclus ardesiacus, sp. n. (Plate II.) 



C cinereus, subtus dilutior, capite toto fuscescente, gula albi- 

 cantiore, alis et cauda fusco-nigris, alarum tectricibus et 

 secundariis cinereo marginatis : ciliis ut in fere omnibus 

 hujus generis speciebus, albis, rostro nigro, pedibus flavis : 

 long, tota 5'5, alse 3*2, caudse 16, rostri a rictu 0*9 poll. 

 Angl. $. 

 Juv. c? • Corpore subtus albido, alarum tectricibus albo terminatis. 

 Hab. Veragua, Cordillera de Tole [Arce). 

 Mus. Salvin & Godman. 



The primaries are proportioned as in C. mexicanus ; namely, 

 the third and fourth are nearly equal and longest, the second 

 equalling the fifth, and the spurious first primary being about 

 the same length as that of the northern bird. It is at once 

 distinguishable from its ally by its smaller size, pale cinereous 

 colour, its long bill (equalling that of C. mexicanus), and long 

 yellow tarsi and feet. In its pale colour it more nearly resembles 

 a specimen we have from Nebraska than our Mexican example. 



Two specimens of this interesting addition to our knowledge 

 of this genus were lately forwarded, in a collection of birds, 

 from Veragua, where it was collected by M. Enrique Arce in a 

 district he calls the Cordillera de Tole, situated between Chi- 

 riqui and the town of Santiago de Vei'agua. Unfortunately 

 he sent no note of the altitude at which he met with these 

 two specimens, nor any information respecting them, except 

 marking the sexes. 



B. Species inhabiting the Southern Hemisphere. 



12. Cinclus leucocephalus. 



Cinclus leucocephalus, Tsch., A v. Consp., and Faun. Per. Av. 

 p. 180, pi. 15. f. 1 ; Bp. Consp. i. p. 252 ; Baird,Rev. A.B. i. p. 61. 



