671 
Analysis of genera 
1 
a * Nettastominae* Nostrils superior* posterior above and before 
eye* anterior at tip of bony portion of snout* 
b^* Snout not ending in fleshy proboscisj front nostrils near 
snout tip* 
Hind nostril before eye on level with its upper front 
@dge* JWettag toma*_ 
Hind nostrils begin above middle of eye in interorbital 
and extend backward* converging toward middle line* 
_Me togomycter * 
b # Snout with long slender fleshy tip or proboscis* at base of 
. i* 
which front nostrils* Venefica. 
2 
a # C^lopsinae* Nostrils lateral* posterior slit like and placed 
just in front of eyej snout without fleshy tip* Chlopsis* 
