Page 590. 
250 ON THE ANATOMY OF THE PARROTS. 
mately forms part of the flexor perforans digitorum, is present in the 
following genera— 
Ara, Nestor, 
Bolborhynchus, Peocephalus, 
Caica, Psittacus, 
Conurus, Stringops. 
It is absent in 
Agapornis, Licmetis, 
Aprosmictus, Loriculus, 
Brotogerys, Lortus, 
Cacatua, Melopsittacus, 
Calopsitta, Paleornis, 
Calyptorhynchus, Pionus, 
Chrysotis, Platycercus, 
Coracopsis, Prioniturus, 
Cyanorhamphus, Psephotus, 
Eclectus, Psittacula, 
Holophus, Psittinus, 
Eos, Pyrrhulopsis, 
Euphema, Pyrrhura, 
Geopsittacus, Tanygnathus, 
Lathamus, Trichoglossus. 
The only other well-defined groups of birds in which the ambiens 
muscle is known to vary are the Columbe and the Struthiones. 
TII. The presence or absence of the furcula. 
By this expression is meant the presence or absence of the furcula 
as a complete bone; for in those Parrots in which it is said to be 
absent, the scapular ends of the two parts of which it is composed are 
frequently to be found, being of considerable length in Stringops and 
some of its allies. 
The furcula is complete in 
Aprosmictus, Coracopsis, 
Ara, Eclectus, 
Bolborhynchus, Holophus, 
Brotogerys, Hos, 
Cacatua, Lathamus, 
Caica, Tiemetis, 
Calopsitta, Loriculus, 
Calyptorhynchus, Lorius, 
Chrysotis, Nestor, 
Conurus, Paleornis, 
_—_— 
