288 



ELEMENTARY STUDIES IN INSECT LIFE 



mandibles in males large, and armed with projections 



or teeth. Lucaniilm. 



(Stag Beetles.) 



DD. The ventral surface of abdomen divided into six 

 segments; elytra do not usually cover entire dorsal sur- 

 face of abdomen. flcarabacidae. 



(Chafers ; June-Bugs.) 



CC. Antenna? never lamelliform, but thread-like or nearly so. 

 (Adephaga.) 

 D. Legs fitted for running. Terrestrial insects. 



E. Clypeus extending laterally in front of base of 

 antennae; i.e., antennae inserted in front above base 



of mandibles. Cicindclidae. 



( Tiger Beetles.) 



EE. Clypeus not extending laterally in front of base 

 of antennae; i.e., antenna- coming from the side of the 



head between base of mandibles and the eyes. 



Cardbidae. 



(Ground Beetles.) 

 DD. Legs, especially the hind legs, fitted for swimming; 



not capable of ordinary walking. Di/tiNci<lu<: 



( Predaceous Diving Beetles.) 



BB. Front and middle tarsi five-jointed, 

 hind tarsi four-jointed. (Heteromera.) 

 C. Prothorax wider than head ; front 

 coxa 1 separated, not protruding; body 



and wing-covers firm. Tciu-bi-ion'nl<n-. 



(Darkling Beetles ) 



CC. Prothorax narrower than head ; 

 front coxae near together, protruding; 



body and wing-covers soft. Meloidae. 



( Blister Beetles.) 



BBB. Tarsi four-jointed (apparently), but 

 with a small indistinct joint between the 

 third and fourth clearly visible segments. 

 (Phytophaga.) (See Figure 210.) 

 C. Body elongate, antennae long, fre- 

 quently as long as the body or longer; 



the larvae are borers. Cerambycidae. 



(Long-horned Beetles.) 



CC. Body short, more or less oval, an- 

 tenna? short. Chrysomclidae. 



( Leaf Beetles.) 



FIG. 216. Tarsi 

 of beetle, showing 

 indistinct fourth 

 segment. (After 

 Comstock.) 



