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ON CERTAIN MUSCLES OF BIRDS. 197 
Haliaétus vocifer. Falco melanogenys. 
— albicilla. lanarius. 
Aquila nevioides. Hypotriorchis subbuteo. 
—— audaz. Tinnunculus alaudarius. 
Spilornis cheela. Melieraz monogrammicus. 
Thrasaétus harpyia. Astur palumbarius. 
Falco peregrinus. Circus cineraceus. 
Page 635. 
Outer view of left thigh of Neophron percnopterus, partially dissected. 
8, sartorius ; g, quadratus femoris; gl, glutei; 5 o and 5i, biceps, origin and inser- 
tion; fc, femoro-caudal; sm, semimembranosus; oe, obturator externus; 
ev, caudal vertebre ; P, pubis; BR, rectrices. 
The Strigide possess the femoro-caudal, which is always small ; 
the ambiens, the accessory femoro-caudal, the semitendinosus, the 
accessory semitendinosus, and the postacetabular portion of the tensor 
fascie are absent. 
Species examined. 
Striz flammea. Syrnium nebulosum. 
Otus vulgaris. Bubo mazimus. 
brachyotus. virginianus. 
Syrnium aluco. — bengalensis. 
