300 



B. Cal. p. 20 ; Westerm. Bijdr. tot de Dierk. pt. 2. — Psaltriparus 

 personatus, Bp. Compt. Rend. xxi. p. 478. 

 <? et ?, Parada, Dec. 1857, et Jan. 1858. 



43. SlTTA CAROLINENSIS, L. 1 



<? et ?, Parada, Oct. 1857. 



M. Salle's collection contains examples of both sexes of a Nuthatch 

 similar to S. carolinensis of the United States, but of inferior dimen- 

 sions ; and, as regards the bill, remarkably smaller. Mr. Cassin 

 has lately separated the Californian representative of S. cai'olinensis 

 from its eastern prototype, under the name S. aculeata ; but this 

 is distinguishable "by its longer and more pointed bill" — the very 

 reverse of the variation in the Mexican birds. The dimensions of 

 this species are as follows : — 



c? . Long.tota 4*9, alse 3*4, caudse 1*8, rostri a rictu 0*8. 



5 . Long, tota 4 - 8, alae 3 # 35, caudse 1'75, rostri a rictu - 65. 

 As far as I recollect, the specimens of this bird from Vera Cruz, 

 there, were of the ordinary size. 



44. Regulus calendula. 

 Parada, Nov. 1857, juv. 



45. Turdus migratorius, Linn. P. Z. S. 1856, p. 294. 

 Parada, $ juv. 



46. Turdus silens, Sw. Phil. Mag. 1827, p. 369 ; North. Zool. 

 ii. p. 186. 



3 et $ similes, Parada, Jan. 1858. 



This is evidently the true T. silens of Mr. Swainson, and agrees 

 with his detailed description in the ' Northern Zoology.' Professor 

 Baird has given an excellent account of this puzzling little group of 

 Thrushes in his General Report on North American birds, the first 

 sheets of which he has been so kind as to send to me by post. He 

 was, however, unacquainted with this bird, and seems inclined to refer 

 the name to a Mexican variety of Turdus pallasi. The upper sur- 

 face of this bird is paler and more greyish than that of T. swainsoni. 

 From that bird, however, it may be readily distinguished by its 

 yellowish-brown tail — which, however, is not nearly so deeply tinted 

 as in T. pallasi. 



47. FORMICIVORA BOUCARDI, Sp. nOV. 



Nigra : interscapularium basibus, carpo summo, tectricibus 

 alarum inferioribus, maculis parvis in tectricibus alarum supe- 

 rioribus et cauda rectricum lateralium apicibus albis : rostro 

 et pedibus nigris. 

 Long, tota 4*3, alas 1*9, caudse 1*8. 

 S, Acatepec, April 1857. 



This is the first bird of the subfamily Formicivorince I have seen 

 from the north of the isthmus of Panama ; and I call it by the name 

 of its discoverer, M. Adolphe Boucard, whose collections of beauti- 

 fully prepared skins have much increased our knowledge of the 



