314 Mr. 0. Salvia on Mr. Lawrence's 



the Smithsonian collectors or correspondents. We have a single 

 skin, procured on the Panama railway line. 



Pyrgisoma biarcuatiim and P. kieneri both refer to the same 

 species, which we have called Pyrgisuma cabanisi (see P. Z. S. 

 1868, p. 324, and Exot. Orn. pi. Ixv. fig. 1). 



Young males and females of Chrysomitris mexicana have the 

 rectrices dark, and are without the white mark observable in the 

 male. I have some doubts as to the determination of the spe- 

 cimens called C. columbiana, and think it very possible that they 

 should be referred to the Central- American race C. mexicana, 

 and not to the New-Granadian form, which has the rectrices of 

 a uniform black. 



CORVID^. 



A family so largely represented in Mexico and Guatemala by 

 a number of species, in Costa Rica contains but a single species, 

 which should be called Psilorhinus mexicanus, RUpp., as it dif- 

 fers from the true P. morio, Wagl., in having the lower parts 

 and extremities of the rectrices white instead of sooty brown. 



DeNDROCOLAPTIDjE. 



Oxyrhynchus flammiceps is O. /rater, Scl. & Salv. (P. Z. S. 

 1868, p. 326, and Exot. Orn. pi. Ixvi.). Picolaptes compressus 

 and P. lineaticeps of Mr. Lawrence's Catalogue both refer to the 

 same species, which should be called P. compressus (Cab. J. f. 

 Orn. 1861, p. 243). 



FORMICARIID^. 



Thamnophilus doliatus and T. affinis also refer to one species, 

 T. affinis. Cab. Gymnocichla nudiceps is G. chirolcuca, Scl. & 

 Salv., a species we have only recently separated (Proc. Zool. Soc. 

 June 1869). 



TyRANNIDvE. 



The species called Platyrhynchus cancrorninus by Mr. Law- 

 rence is, I think, very likely to be the Ecuadorean P. albogu- 

 laris, Scl., of which Mr. F. Godman and I have specimens, 

 from Costa Rica and Veragua, agreeing with Mr. Sclater's types. 

 Mionecles olivaceus, Lawr., is closely allied to M. striaticollis, 

 Lafr., but, having the head olivaceous instead of plumbeous, is, 



