ARTICULATA. 289 
House-fly makes 330 strokes. A few species are wingless. 
The eyes are large, with numerous facets; the tongue ter- 
minates in a fleshy knob, and the other parts of the mouth 
are fitted for suction, being generally converted into fine 
Fic. 261.—Metamorphosis of the Mosquito (Culex pipiens). 
19 
