96 ' RHYNCHOPHOKA — SCOLYTIDAE. 



close, nearly equally strong punctured striae, apex con- 

 fusedly punctured. L. 1 — IJ 1. Eatlier common. 



S. mi'Jtistriatus, Marsh. 



Toniicus. 



A, First joint of club of antennae angularly produced 

 above ; prosternal process shorter. 



<T. Apical impression of elytra with six teeth on each 

 side, the three upper ones being small and the fourtli 

 largest. 



Black, with brown elytra, or entirely brown or yellow- 

 brown. Similar to T. typographus but with hinder part of 

 thorax strewn with deeper punctures (except smooth 

 central line) and elytra with stronger punctured striae. 

 L. 3 — 3f 1. Eare. T. stenographus, Duft. 



h. Apical impression of elytra with four teeth on each 

 side, the uppermost one often indistinct and the third 

 largest. 



Black, with brown elytra, or entirely broAvn or yellow- 

 brown. Front half of thorax closely granulate, hinder 

 part finely and diffusely punctured ; scutellum small, 

 smooth, even ; elytra with fine punctured striae, punctures 

 feebler behind. L. 2 — 2 J 1. Rare. T. typographus, Lin. 



c. Apical impression of elytra with three teeth on each 

 side, the lowest one largest. 



Lighter or darker brown ; antennae and legs yellow- 

 brown ; moderately shiny ; with long, yellow-gray hairs. 

 Tliorax rather closely punctured, granulate in front, without 

 smooth central line behind ; elytra flattened in a circle at 

 apex, margin of impression nearest suture scarcely raised, 

 its lateral margin with three teeth, of which the uppermost 

 is only a little prominence and the lowest one (placed about 

 middle of margin) is a rather long, pointed tooth. Elytra 

 shorter than in preceding species, with striae shallower, 

 tibiae less dilated and first joint of club of antennae less 

 produced. L. 1| — If 1. Eather common. 



T. acuminatus, Gyll. 

 Z?. First joint of club of antennae not angularly produced 



above ; prosternal process longer. 



n. Club of antennae rounded at apex, sutures between 

 its joints straight. 



