318 HETEROMERA. 



covered ; anterior coxae globular or slightly transverse, 

 sometimes cylindrical and prominent, in latter case con- 

 tiguous ; intermediate pair with trocliantina. Cistelidae. 



J5. Socket holes of anterior coxae open behind, or if closed 

 (Lagriidae) with anterior coxae contiguous and tarsal 

 claws simple. 



a. Mentum not carried by a peduncle of submentura. 



I. Head not constricted into a neck behind. 



1, Thorax narrower at base than elytra. 



Ligula more or less prominent ; maxillary lobes fringed ; 

 head horizontal or slightly inclined ; eyes entire ; antennae 

 threadlike, gradually thickened, or ending in a little club, 

 base free ; pronotum scarcely ever separate from sides of 

 prothorax ; legs short, anterior coxae conico-cylindrical, 

 almost invariably contiguous ; penultimate tarsal joint 

 entire, claws simple. Pythidae. 



2, Thorax not narrower at base than elytra. 



Ligula more or less prominent ; maxillary lobes fringed ; 

 maxillary palpi large, often sawlike, last joint hatchet- 

 shaped ; head bent downward ; eyes almost invariably 

 emarginate ; antennae nearly always threadlike or slightly 

 thickened toward apex, base free ; pronotum separate from 

 sides of prothorax ; anterior coxae variable ; intermediate 

 coxae with trochantina ; penultimate tarsal joint often 

 bilobed, claws nearly always simple. Melandryidac. 



II, Head constricted into a neck behind (rarely absent 

 in Lagriidae, where socket holes of anterior coxae 

 are closed behind.) 



1, Socket holes of anterior coxae closed behind. 



Ligula horny, prominent ; maxillary lobes fringed ; head 

 prominent ; eyes more or less emarginate ; base of antennae 

 free ; thorax narrower than elytra at base, pronotum not 

 separate from sides of prothorax ; anterior coxae prominent, 

 cylindrical or conical, contiguous or nearly so ; inter- 

 mediate coxae with trochantina ; tarsal claws simple. 



Lagriidae. 



2, Socket holes of anterior coxae open behind. 

 A. A, Posterior coxae contiguous. 



