466 Dr. E. Loimberg on Birds from 



44. Bubo virginianus (Gm.). 



Only one specimen, shot at Colonia Crevaux in April 

 1902. 



45. Speotyto cunicularta (Molina). 



This Owl was observed sitting in bushes on the grassy 

 plains looking out for small birds and mice, which constitute 

 its principal food. It was plainly diurnal. 



Specimens shot at Tatarenda, in March and April 1902, 

 have the length of wing 183-186 mm. Under surface of 

 wing, including the wing-coverts, entirely white with a 

 very faint isabelline tinge, and a few of the outer large 

 coverts with dusky tips, together forming a dark band. 

 The inner webs of the secondaries almost entirely white. The 

 outermost tail-feather dusky white throughout, except for 

 two dusky spots on the outer web; the rest have the whole 

 inner web white, the bars being confined to the outer web. 

 On the third and fourth the dark bai's cross over the inner 

 web also, but are much narrower and less well-defined on 

 the inner web, the ground-colour of which is white. The 

 specimens from this station were accordingly decidedly lighter 

 than the specimens from Moreno (see above, p. 448), which 

 had all the tail-feathers, including the outermost, barred 

 across both webs, although on a white ground-colour. 



I regard the Owl from Moreno as identical with the 

 typical Strix cunicularia from Chile. All other known 

 varieties of Speotyto are darker than the Chilian form * ; 

 but, on the other hand, as the Burrowing-Owls of the 

 Bolivian Chaco are still lighter than the Chilian, they might 

 be regarded as representing a geographical variety or sub- 

 species. 



The size of the Bolivian Owl is comparatively large, 

 as is alsoithat of the Chilian. 



16. Syrnium perspicillatum (Latham). 

 A specimen shot at Tatarenda, March 29th, 190.2. Iris 

 yellow. 



* Cf. Stone, "On a Collection of Birds .... with a Review of the 

 South-American Species of Speotyto and Troglodytes" Proc. Acad. Nat. 

 Sci. Philadelphia, 1899. 



