188 NORTH AMERICAN INSECTS. 
Sphinx. After its last transformation into a winged insect 
it becomes a Hawk-moth, so called because while sucking 
the nectar from the cups of flowers it is hovering in the air 
like a hawk. It is also called by some the Humming-bird 
Hawk-moth, from the humming sound which it produces 
with its wings, and by rubbing its horny proboscis upon the 
small glassy membrane beneath it. 
Figure 44, 
Five-spotted Hawk-moth. 

