Page 634. 
196 ON CERTAIN MUSCLES OF BIRDS. 
The ambiens is absent in :— 
Pyrrhura (Conurus) eruentata. Oalopsitta nove-hollandice. 
Brotogerys tiriacula. 
Cacatua galerita. 
virescens. * cristata. 
tovi. roseicapilla. 
twi. Calyptorhynchus banksit. 
Pionus menstruus. Eos cardinalis. 
Chrysotis festiva. indica. 
ochrocephala. Tanygnathus muellert. 
levaillantiz. Prioniturus, sp. 
Psephotus hematogaster. 
Platycercus eximius. 
Trichoglossus concinnus. 
Lathamus discolor. 
pallidiceps. Aprosmictus scapulatus. 
Psittacula passerina. Loriculus asiaticus. 
Agapornis roseicollis. chrysonotus. ~ 
Melopsittacus undulatus. Cyanorhamphus auriceps. 
Euphema splendida. nove-zealandic. 
—— pulchella. Paleornis torquata. 
bourkit. 
Accipitres.—The Cathartide possess the ambiens, the semitendino- 
sus, the accessory semitendinosus, and the postacetabular portion of the 
tensor fasciee ; the accessory femoro-caudal is absent, and the femoro- 
caudal is present, though small, in 
Cathartes atratus ; 
it is absent in 
Gyparchus papa. 
The Serpentariide possess the ambiens, the accessory femoro- 
caudal, the semitendinosus and the accessory. semitendinosus; the 
femoro-eaudal and the postacetabular portion of the tensor fascis are 
absent. 
Species examined. 
Serpentarius reptilivorus. 
The Vulturide and Falconide agree in possessing the ambiens and 
the femoro-caudal; the accessory femoro-caudal, the semitendinosus, 
‘the accessory semitendinosus, and the postacetabular portion of the 
tensor fascie are absent in all. 
Species examined. 
Milvus ictinus. 
Buteo vulgaris. 
Archibuteo lagopus. 
Helotarsus ecaudatus. 
Neophron percnopterus. 
Gyps fulwus. 
Vultur auricularis. 
Polyborus brasiliensis. 
