Vol. 34, pp. 89-92 June 30, 1921 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF SIX NEW SUBSPECIES OF AMERI- 

 CAN BIRDS. 



BY OUTRAM BANGS AND THOMAS E. PENARD. 



In the course of our work we have discovered the following 

 new subspecies of American birds : 



Geranospiza caerulescens livens, subsp. nov. 



Type. — M. C. Z., 224,793, adult 9 , parent of eggs; Northwestern Mexico: 

 Alamos, State of Sonora, 9 February, 1888; M. Abbott Frazar. 



Subspecific characters. — Similar to Geranospiza caerulescens niger (Du 

 Bus), and of about the same size, but much paler, not blackish, between 

 neutral gray and deep neutral gray of Ridgway; larger than Geranospiza 

 caerulescens caerulescens (Vieillot), and darker, being intermediate in 

 coloration between G. c. caerulescens and G. c. niger. 



Measurements (in millimeters). — 



Sex 



M. C. Z. 224,793 (type) 9 



" 224,792 _ cf 



Specimens examined. — 



G. c. livens, two: — N. W. Mexico: Sonora, Ic?, 19- 

 G. c. niger, seven : — Mexico : Tampico, 1 9 ; Vera Cruz, 1 c? . Costa 

 Rica : Tenorio, 1 9 ; Boruca, 1 cf ; Bolson, 2 99. Panama : 

 Dival, 1 d*. 

 G. c. caerulescens, three: — "Brazil," 1 9- Surinam, 1 c?, 1 9- 

 So far as we are aware, no bird of this genus has ever before been recorded 

 from any locality so far northwest as Sonora. Both specimens, probably 

 a pair, were collected at Alamos by Frazar on the same day. 



Otus choliba luctisonus, subsp. nov. 

 Type. — M. C. Z., 116,530, adult c?; Costa Rica: Escazu, 26 November, 

 1900. 



Subspecific characters. — Similar to Otus choliba crudgerus (Spix) of the 

 Amazon River Region, and of about the same size, but upper parts paler, 

 17— Proc. Biol. Soc. Wash., Vol. 34, 1921. (89) 



