M COLEOPTERA. 



The larva; are found in the grass, and under sticks 

 and stones. They are also predaceous, sometimes 

 overpowering insects many times as large as them- 

 selves. (1,430; 14, I., 57). 



The Caterpillar Hunters, Calosoma and Carabus. 



The Bombardier beetles, Brachinns. 



'Dx-n^clUM {The Diving Beetles or Water Tigers.) 



Beetles of an oval, flattened, elliptical or rounded 

 form. They are aquatic, carnivorous, and closely re- 

 lated to the Carabidae, differing from them only in the 

 form of the large posterior coxa;, and the oar-like na- 

 tatorial legs. Posterior legs usually compressed and 

 elongated. Note mode of respiration, flight, &c. 



Larvae very active, long, cylindrical, provided with 

 very long sickle shaped mandibles. They are carni- 

 vorous, and well merit their popular name, Water 

 Tigers. 



Pupa; in round cells in the ground, (i, 435 ; 14, I., 

 93)- 



Gyrinid.k [Whirligigs.) 



Beetles of an oval form, and usually brilliant bluish 

 black color. Legs fitted for swimming ; anterior pair 

 very long, middle and posterior pair short, broad and 

 much flattened. Aquatic. Note differences in habits 

 between this and preceeding family. 



" The cylindrical eggs are placed by the female, end 

 to end, in parallel rows on the leaves of aquatic plants, 

 and the larvae are hatched in about eight days. They 

 are myriapodous in form, with a pair of large, long, 



