18 POPULAE ENTOMOLOGY. 



oval, and generally depressed ; eyes slightly prominent ; 

 colour generally dark brown, olive, or black. Locality, 

 stagnant water, but occasionally found flying. 



4. GynnidiB. — Antennae very short; anterior legs long; 



four posterior legs very short and flat; mandibles 

 short, horny, and notched; maxillae flat, curved, and 

 acute at the tip ; body generally ovate and depressed ; 

 eyes consisting of two pair ; colour metallic ; size small. 

 Locality, running water, though sometimes found flying. 



5. Hydropliilida. — Antennae clavate ; legs formed for swim- 



ming, and hairy; mandibles much toothed; maxillae, 

 outer lobe short and broad; body hemispherical and 

 convex; maxillary palpi very long; colour generally 

 obscure ; size large. Locality, water and water-plants. 



6. 8Upliid(E. — Antennae thickened at the tip; mandibles 



very strong ; maxillae with two lobes ; palpi filiform ; 

 body depressed ; colour obscure ; size moderate. Lo- 

 cality, dead animal matter. 



7. Bermestidce. — Antennae short and clavate; legs short; 



jaws short and thick ; body thick and oblong, rounded 

 at each end, and clothed with scales or hairs, which 

 give it a variety of tints ; size small. Localities, dried 

 skins and fur, also bacon, books, etc. 



