27 



"55. Climacocercus guerilla'^, (Cass.), Pr. Phil. 

 Acad., 1848, p. 87. [Talapa, Mex.] 

 Grey-throated Harrier-Hawk. 



Wing (^ 176, 2 185 mm. ; above blackish ; 

 tail with 3 irregular white bands ; throat 

 and cheeks pale grey ; below dull white 

 closely barred down to thighs with blackish 

 narrow bands (narrower and closer than in 

 zonothoyux. 



Mexico to 

 Colombia, 

 Venezuela, 

 Brazil, and 

 Ecuador. 



Gen. XXI. GERANOSPIZIAS Sundev. (1873). 

 Type by sub. desig. Chubb (1916) G. gracilis. 



Tarsus scaled behind ; thighs without overhanging 

 tuft of feathers ; ridge of bill greater than half 

 length of middle toe (without claw) ; commissure 

 slightly festooned. 



Size moderate (length 16.5-24-5 in.). 



56. Geranospizias cayidescens ccerulescens Venezuela, 



(VieilL), N. Diet., x., p. 318 (1817). Amer. Guiana, E. 



mcrid. ; type loc. subst. Brazil, Brab. and Colombia ; 



Chubb.] W. Brazil. 

 Grey Crane- Hawk. 



Wing S 245, ? 270 mm. ; plumage slaty 

 blue, with little trace of white cross bars 

 except on thighs and under wing-coverts ; 

 tail ochraceous white with 2 broad black 

 bands ; immature less blue and with belly 

 ochraceous buff, but not strongly barred. 



56a. Geranospizias ccerulescens balzarensis W. Ecuador 



Sclater, Bull. B.O.C., xxxvih., p. 44 (1918). (Guayas Prov. 



[Balzar Mtns., Guayas Prov., type in B.M.] & Puna L), 



Ecuador Crane-Hawk. Peru. 



•* In revising this group the forms jugularis and interstes appear to be untenable 

 and are therefore omitted. 



