MUSEUM OF COMPARATIVE ZOOLOGY 353 



effectually remove small obstructions as they swing from side to side in run- 

 ning. Their favorite haunts are among the precipitous and broken rocks on 

 the shores of the lake, the hillsides, and the banks of the streams. As is the 

 case with the beaver, new colonics are formed by the young males that are 

 driven from the paternal burrow by the old ones. After a young one has 

 established himself in a burrow of his own construction, usually a few rods 

 distant from the one from which he has been driven, he induces a female 

 to share it with him, and a new vizcacheria is founded. We found many 

 vizcacherias amongst the guacas or tombs. The Indians affect to believe 

 that they are the people (' los viejos ') who hundreds of years ago were 

 buried in these sepulchres and have been transformed." 



BIRDS. 



1. Turdus chiguanco Lafr. & D'Orb., Conitna and Moho. Five 

 specimens. " ' Chihuanco.' Common on the Southern shores. Notes, 

 nests, and eggs very much like those of T. migratorius." 



2. Procnias occidentalis Sclat. One specimen, Coroico, Bolivia. 

 Collected by Mr. Walter Davis. 



3. Tanagra palmarum Max. Two specimens, Coroico, Bolivia. Col- 

 lected by Mr. Walter Davis. 



4. Ramphoccelus atrosericeus Lafr. & d'Orb. One specimen, Co- 

 roico, Bolivia. Collected by Mr. Walter Davis. 



5. Basileuterus bivitatus (Lafr. & d'Orb.). One specimen, Coro- 

 ico, Bolivia. Collected by Mr. Walter Davis. 



6. Hirundo andicola (Lafr. & d'Orb.). Two specimens ; Moho. 



7. Atticora cinerea (Gm.). One specimen ; Moho. 



8. Phrygilus fruticeti (Kittl.). "Abundant among the shrubbery 

 at the south end of the lake." Two £, one 9. 



9. Phrygilus Gayi (Eyd. & Gerv.). " Common towards the southern 

 end of the lake." Moho and Tiquina. Two specimens. 



10. Zonotrichia pileata (Bodd.). "Abundant about nearly all parts 

 of the lake." Coroico (Davis), Moho and Conima (Garman) ; seven 

 specimens. 



11. Chrysomitris atrata (Lafr. & d'Orb.). Moho; four specimens. 

 " ' Silgarito.' Very common in the towns, inhabiting the thatch of the 



eaves and gables of the houses. A very lively little fellow and a fine singer. 

 His song is quite as jolly as that of the Bobolink. A friend had one in a 

 cage that would throw himself back on his perch, partly spread his wings, 

 and sing as if in a perfect ecstasy whenever a handkerchief was shaken over 

 his head." 



