158 INTRODUCTION. 



ii. Tarsal claws pectinate Cistelidaa, p. 163. 



II. Anterior coxal cavities open behind, 

 i. Prothorax without sharply produced or 

 strongly dentate margins ; size mod- 

 erate or small. 



1. Head not strongly and suddenly con- 



stricted at base. 



A. Middle coxae not very prominent ; 



antennae received into grooves on 



the prosternum Monommidae, p. 163. 



B. Middle coxae very prominent ; epi- 



pleurae of elytra almost absent . . QUdemeridae, p. 165. 



2. Head strongly constricted at base. 



A. Prothorax at base not narrower 



than base of elytra, 



a. Lateral suture of prothorax dis- 



tinct. 



«*. Posterior tibiae as long as the 

 tarsi ; tarsal claws with a 

 rudimentary tooth at base ; 

 penultimate joint of tarsi 



strongly foilobed Scraptiidae, p. 167. 



b*. Posterior tibiae shorter than 

 the tarsi ; tarsal claws usually 

 plainly toothed ; penultimate 



joint of tarsi simple . . Mordellidae, p. 167. 



b. Lateral suture of prothorax ob- 



solete Rhipiphoridae, p. 168. 



B. Prothorax at base plainly narrower 



than base of elytra. 



a. Tarsal claws split from base to 



apex Meloidae, p. 170. 



b. Tarsal claws not split. 



a*. Antennae serrate, subpectinate, 

 or ramose 1 ; size compara- 

 tively large ; head exserted, 

 horizontal or almost hori- 

 zontal Pyrochroidae, p. 172. 



b*. Antennae filiform or monili- 

 form (very rarely Habellate) ; 

 size very small; headdeflexed. 

 «t- Penultimate joint of the 

 tarsi minute, hidden within 

 the lobes of the preceding 

 joint, which is strongly 

 bilobed ; head constricted 

 immediately behind the 



eyes, Avhich are large Xylophilidae, p. 173. 



by. Penultimate joint of tarsi 

 not minute, bilobed ; head 

 constricted at some dis- 

 tance behind the eyes, 

 which are moderate or 



small Anthicidae, p. 173. 



1 In one genus, Ischalia, from Borneo, they are almost filiform. 



