OCTOTEMNUS. 89 



Octofeniniis, 



Chestnut-brown, without pubescence. Thorax very finely 

 punctured ; elytra closely punctured, here and there some- 

 what in wrinkles. L. | — f 1. Common. 



0. glahricuhis, Gyll. 



RHYNCHOPHORA. 



A. Head not produced into a rostrum, or only slightly so ; 

 in latter case outer margin of tibiae toothed. 



Mentum prominent, generally received at base into an 

 emargination of submentum ; maxillae nearly always with 

 one lobe; palpi short; antennae inserted almost always 

 between eyes and mandibles or on sides of rostrum, short, 

 elbowed and clubbed, with from three to twelve joints ; 

 eyes generally large and transverse ; pronotum rarely 

 separate from sides of prothorax ; tibiae flattened, nearly 

 always toothed on outer margin ; tarsi not spongy beneath, 

 thread-like, third joint entire or bilobed but never much 

 dilated ; abdomen with five segments. Scolytidae. 



-/?. Head produced into a longer or shorter rostrum ; outer 

 margin of tibiae not toothed. 



a, Labrum absent. 



Mentum placed in an emargination of submentum or 

 carried by a stalk rising from bottom of latter ; maxillae 

 generally with one lobe ; palpi very short ; antennae in- 

 serted on rostrum, generally elbowed, and nearly always 

 clubbed, with from eight to twelve joints ; pronotum not 

 separate from sides of prothorax ; tarsi generally spongy 

 beneath, third joint usually bilobed ; abdomen with five, 

 rarely six segments, third and fourth usually shorter than 

 the others. Curculionidae. 



b, Labrum distinct, rounded and fringed in front. 



Sub-meritum provided wdth a large and broad bilobed 

 stalk, enclosing the mentum and ligula between its lobes ; 

 maxillae with two lobes mandibles more or less prominent, 

 flattened, dilated and toothed at base, curved and acute at 

 apex; antennae inserted on rostrum, not elbowed, generally 

 clubbed, sometimes threadlike, with eleven joints ; thorax 



