Key to the Genera. 
A, Tail less than two-thirds of wing in length : 
a. Neck-feathers not acuminate ; dark bars on secondaries Columba. 
6. Neck-feathers acuminate ; no dark bars on secondaries Dendrotreron. 
B. Tail exceeding two-thirds of, but not longer than, wing : 
c. Larger, wing 7.5 in. or over; no white tips to tail- 
feathers ; tarsus shorter than middle toe with- 
out claw : 
a’ A white bar, conspicuous beneath, across tail ... Palumbus. 
b’ Nowhite baracrosstail _.... eee o Alsocomus. 
d. Smaller, wing 7.4 in. or under; white or grey tips to 
tail; tarsus longer than middle toe without 
claw : 
ce’ Sexes alike ; second and third quills longest ... Streptopelia. 
d’ Sexes different ; first and second quillslongest ... Oenopopelia. 
C. Tail longer than wing, and much graduated iss ...  Macropygia. 
