Kidgway.] 80 [May 21, 



(as species of Scops and Glaucidium, Syrnium aluco, etc). The 

 amount of the rufous wash Varies almost with the individual, so that 

 it is impossible to separate specifically the two styles. In the young 

 plumage (M. guerilla Cassin), the difference in the two phases is not 

 so great as in the adult dress ; but those of the rufe scent style have 

 a more or less appreciable wash of rusty across the jugulum. One 

 specimen has the upper parts variegated by somewhat concealed 

 transverse spots of whitish. 



The M. ruficollis, M. zonothorax, M. guerilla, and, apparently, also 

 the M. leucauchen of Sclater and Salvin's paper in the Proceedings 

 of the Zoological Society of London, 1869, (pp. 364-369) belong to 

 this species. 



4. Micrastur leucauchen (Temminck). 

 Falco leucauchen Temm., PI. Col. 36; 1823. — Pucher., Rev. Zool. 



1852, 91. 

 Astur leucauchen Less., Man. Orn. i, 92. — Id. Tr. Orn., 60. — Cuv., 



Reg. An. ed. 2, 332. 

 Nisus leucauchen Less., Tr. Orn:, 60. 

 Accipiter leucauchen Gray, List B. Brit. Mus., 68. — Cass., P. A. N. S. 



1848, 88. 

 Micrastur leucauchen Bonap., Consp. i, 30. — Strickl., Orn. Syn. i, 



123. 

 Sp. ch. Wing, 6.20-6.60; tail, 7.20-7.50 ; culmen, .50-.55 ; tarsus, 

 2.00-2.10; middle toe, 1.00-1.10. Graduation of the tail, about 2.00. 

 Chin, throat, and crescent extending upward behind the auriculars, 

 along the lower half of the " ruff," immaculate white, quite abruptly 

 defined. Adult. Above umber-brown, sometimes tinged with sepia, 

 interrupted by a nuchal collar of partly concealed white spots; 

 top of the head usually darker. Tail darker, with 6-7 narrow in- 

 terrupted bands of transverse white spots. Beneath white, some- 

 times tinged with ochraceous, the breast more or less washed with 

 rufous; the whole surface, except the throat and anal region, nar- 

 rowly barred transversely with blackish, the bars fainter in the red- 

 dish of the breast. 



Specimens examined. Philad. Acad., 4. 

 Hah. Brazil. 



The M. leucauchen of Sclater and Salvin (see above) is appar- 

 ently not this species, which is well figured in Temminck's plate, 



