NXCROPODIDAE 
ja. Size large. 
b. Throat dark 
Streptoprocne 
bb* Throat and upper chest pure white• 
Panyptila 
aa* Size small. 
b* A chestnut brown band around neck. 
bb» No colored band around neck* 
£• Under parts and rump darker 
jd* Larger* wing 122-133 
dd* Smaller, wing 105-116.5- 
cc♦ Under parts and rump pale 
brownish gray (wing 107-117) 
Cypseloides 
Chaetura 
C. pelagica 
C* richmondi 
C* vauxii 
