106 KIIYNCHOPHORA — SCOLYTIDAE. 



more elongate than H. opacus, punctuation of thorax rather 

 coarser, space between punctures shiny, tibiae a little more 

 dilated. L. 1| 1. Eare. H. angustatus, Herbst. 



-£►. Mesosternum with a small prominence between inter- 

 mediate coxae ; third tarsal joint dilated, bilobed. 

 ci. Thorax reddish-brown. 



Black ; thorax and elytra (except side margin) reddish- 

 brown ; antennae and legs rust-red ; with fine gray hairs, 

 Eostrum with a small, raised central line, sometimes with 

 a feeble crescent-shaped furrow at base ; thorax strongly 

 and very closely punctured, almost in wrinkles, with a very 

 narrow, smooth central line ; elytra with deep punctured 

 striae, interstices granulate and wrinkled. L. 1^ — 1| 1. 

 Common. H. palliatus, Gyll. 



b. Thorax brown-black. 



Short. Brown-black, obscure, slightly pubescent ; elytra 

 dull red or pitcliy ; legs and antennae dull red. Tliorax 

 closely and strongly punctured, with an obscure dorsal 

 ridge ; elytra with deep punctured striae. L. 3 J 1. Eather 

 common. H. olscurus, Marsh. 



CUBCTILIONIJDAE, 



A . Mentum leaving maxillae entirely uncovered. 



II, Anterior coxae placed more or less apart {Gymnetron 

 excepted), presternum generally with a furrow between 

 them. 



X. Club of antennae solid ; tarsi imperfectly or not 

 spongy beneath, third joint generally entire, with 

 fourth joint inserted in depression on its upper 

 surface. 



1, Pygidium covered by elytra. 



Peduncle of submentum short, sometimes indistinct ; eyes 

 at most moderately large, often very small or absent, standing 

 far apart beneath, either finely or coarsely granulate ; club 

 of antennae oval or nearly globular ; tibiae hooked at apex ; 

 third tarsal joint often a little broader than second, rarely 

 bilobed. Cossonides. 



2, Pygidium not covered by elytra. 



Peduncle of submentum reaching level of front of 

 emarginatiou ; eyes very large, standing almost always near 



