THE CLASSIFICATION OF BIRDS. 281 
waries'. The third family consists of the American Ostriches, 
or Rheas?, and the true Ostrich, which, as the type, deter- 
mines the name of the family to be Struthionde. 

The following table expresses the groups of Birds, with the 
names of the genera pertaining to each family and subfamily, 
and a figure indicating the probable minimum number of species 
in each genus. These numbers are not always to be taken as 
expressing the total number now described, but as an approxi- 
mation thereto. 
Class AVES. 
Subclass lL. CARINAT A, 
Order I. PASSERIFORMES. 
Suborder I. PASSERES. 
Section A. Acromyodi or Oscines. 
Family I. Corvips. 
1. Subfamily Corvine. 
Trypanocorax, 2. Heterocorax,1. Corvus, 11. 
Corvultur, 2. Coleus, 5. Corone, 12. Rhinocoraz, 
1. Gazzola, 1. Mrcrocorax, 4. Physocorax, 1. 
Gymnocorar, 1. Macrocorax, 2. Nuctfraga, 4. 
Strepera,7. Pica,5. Cyanopolius,2. Urocissa, 5. 
Cryptorhina, 1. Dendrocitta, 8.  Crypsirhina, 2. 
Cissa, 3. Calocitta, 2. Platysmurus, 2... Temnu- 
rus, 1. Garrulus, 14. Perisoreus, 4. Cyanocitta, 5. 
Aphelocoma, 8. Cyanocorax, 16, Xanthura, 14. 
Uroleuca, 1. Gymnokitta, 1. Psilorhinus, 3. 
Struthidea, 1. — Picathartes, 1. — Glaucopis, 2. 
Heteralocha, 1. Creadion, 1. Falculia, 1. 
2. Subfamily Fregiline. 
Graculus,1. Pyrrhocorax,1. Corcorax,1. Po- 
doces, 4. 
Family I. PARADISEIDA., 
1. Subfamily Epimachine. 
Ptilorhis, 5.  Seleucides, 1,  Drepanornis, 3. 
Epimachus, 3. 
1 Pp. 66. del (eta 
