506 THE STUDY OF INSECTS. 



DD. Fourth segment of tarsus inconspicuous ; organs of spe- 

 cial sense of antennae diffused. This group contains three 

 families, which are so connected by intermediate forms that 

 it is not easy to separate them. The following characters 

 will aid the student in separating the more typical forms : 

 E. Body elongate; antennae almost always long, often as 

 long as the body or longer. The larvae are borers, p. 567. 



Cerambycid^e. 



EE. Body short and more or less oval ; antennae short. 



F. Front prolonged into a broad quadrate beak; elytra 



rather short, so that the tip of the abdomen is always 



exposed. The larvae live in seeds, p. 58i..Bruchid^e. 



FF. Front not prolonged into a beak ; usually the tip of 



the abdomen is covered by the elytra. Both larvae and 



adults feed on the leaves of plants, p. 574. 



CHRYSOMELIDiE. 



CC. Tarsi varying in form, but when five-jointed not of the type 

 described under C, the joint between the fourth and fifth seg- 

 ments being flexible. 



D. Ventral part of the first segment of the abdomen divided 

 by the hind coxal cavities, so that the sides are separated 

 from the very small medial part. 



E. Metasternum with an antecoxal piece, separated by a 

 well-marked suture reaching from one side to the other, 

 and extending in a triangular process between the hind 

 coxae. 



F. Antennae eleven-jointed; hind coxae mobile, and of the 

 usual form ; habits terrestrial. 

 G. Antennae inserted on the front above the base of the 



mandibles, p. 516' CiClNDELlD^E. 



GG. Antennae arising at the side of the head between 

 the base of the mandibles and the eyes. p. 518. 



Carabid^e. 

 FF. Antennae ten-jointed ; hind coxae fixed and greatly 

 expanded so as to conceal the basal half of the hind 

 femora and from three to six of the abdominal seg- 

 ments ; habits aquatic, p. 522... Haliplid^e. 



EE. Metasternum either with a very short antecoxal piece, 

 which is separated by an indistinct suture, and which is 

 not prolonged posteriorly between the coxae, or without " 

 an antecoxal piece. 

 F. Metasternum with a very short antecoxal piece, p. 521. 



AMPHIZOIDiE. 



