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Show 174 MESSRS. SCLATER AND SALVIN ON PERUVIAN BIRDS. [Feb. 27, its elongated and much attenuated bill, and in its longer and more graduated tail. Fig. 1. Xenospingus concolor. The sexes may be diagnosed as follows : - f. Cinereus: subtus dilutior, magis albicans; fronte et loris nigris : rostro et pedibus flavis: long, tota 6*0, alee 2*8, caudee rectr. med. 2*9, later. 2*5, rostri a rictu 0*6, tarsi 0*95. $. Fuscescenti-cinerea, subtus valde dilutior, fere albicans, obsolete fusco striata; rostro et pedibus fuscis. D'Orbigny obtained a single specimen of this species in the valley of Arica. Mr. Whitely has sent us six examples from the more northern valley of Tambo. 5. ELAINEA ALBICEPS. Muscipeta albiceps, Lafr. et d'Orb. Syn. Av. i. p. 47 ; d'Orb. Voy. Ois. p. 319. This bird, from the locality, we have little hesitation in referring to the present species. Sclater's E. albiceps, Cat. A. B. p. 217. sp. 1325 (from Ecuador) is of larger size, and probably distinct. D'Orbigny procured this bird at Tacna. 6. MYIOBIUS RUFESCENS, Salvadori. M. rufescens, Salvadori, Atti Soc. It. vii. p. 152(1864). M. nationi, Sclater, P. Z. S. 1866, p. 99, t. xi. fig. 1. Dr. Salvadori having most kindly sent over the types of the American species described in his recent papers in the seventh and eighth volumes of the ' Atti della Societa Italiana di Scienze Naturali' for |