26 THE CANADIAN ENTOMOLOGIST, 



AA. Antennige usually without club ; third joint (with one exception) 

 longer than the second. 



b. Head widest behind the eyes ; colour, bright red . . . Ciicujus. 

 bb. Head widest across the eyes. 



c. Antenna shorter than head and thorax Pediaais. 



cc. Antennce longer than head and thorax. 



f. Thorax distinctly serrate at sides Brontes. 



ff. Thorax not serrate at sides, sometimes with a single 

 tooth at anterior angles, 

 g, First antennal joint about as long as the head 



Dendrophagus. 



gg. First joint much shorter than head. 



Thorax as long or longer than broad, size 



usually large Catogenus. 



Thorax transverse, size small . . . LcRmophhvus. 



SiLVANus, Latr. 



Small, usually elongate and somewhat depressed beetles of brownish 

 or ferruginous colour, the elytra with large round punctures arranged 

 in rows. Antenn.-v with the last three joints forming a rather abrupt 

 and loose club. They are usually found in grain, which is often 

 damaged considerably thereby, or under bark, more particularly that 

 of oaks and poplars. The Canadian species may easily be known by 

 the following characters : Fig. i represents 5. sio-inamensis. 

 Prothorax sub-oval, sides each with six large teeth (.10 in.) 



siirmatnetisis, L. 



Prothorax elongate, strongly narrowed behind, . sides not 

 toothed. 



Body very opaque. Thorax longer and with a sharp 



tooth at anterior angles (.ir \x\.)..bidentatus,Ya.hv. 



Body somewhat shining. Thorax v/ider, teeth at angles 



less developed (.lo-.ii in.) pia?iatus, Lee. j,-,^. j_ 



Prothorax broader than long, anterior angles with a small 



tooth (.075 in) advena, Waltl. 



Nausibius, Redt. 



One species ( N. dentattis, Marsh.) is found here. It is larger 

 than Silva?ius, and the antennal club is of gradual formation. In 



