166 ''-''•' 



at— Thorax almost as long as broad, with strongly thickened anterior 



angles, and the sides almost straight with an obsolete middle 



tooth .fumatm, GyW. 



it— Thorax strongly transverse, with less strongly thickened anterior 



angles and a distinct middle tooth. 



a« -Thorax with sides more or less strongly margined. 



#_Elytra with the punctures at base as strong as those of the 



thorax, but more widely separated ; colour uniform reddish. 



+_A.verago size larger ; punctures finer, hair longer... 



badiiis, Sturm. 



-}-|_Average size smaller ; punctures coarser, hair shorter and 



more sparing .fusdcornis, Sturm. 



** - Elytra with the puncturation at base decidedly or at least 



perceptibly finer than that of the thorax. 



t— Antenna) stout ; colour ferruginous, the elytra sometimes 



with a black patch at the suture spreading out towards 



tlie sides ; often, however, entirely ferruginous ; usually 



the largest species, but occasionally quite small... 



populi, Payk. 



tt— Antennre less stout; elytra dark, with a reddish-brown 

 base or entirely ferruginous or brownish-yellow. 

 +— Smaller, sides of thorax more angled at the central tooth, 

 which is distinct ; elytra shorter in proportion to 



thorax ; pubescence shorter scaniciis, L. 



++_Larger, thorax less angled at the central tooth, which is 

 small ; elytra longer in proportion to thorax ; pu- 

 bescence longer ; colour ferruginous... 



snhfumatus, Kr. 



iJ— Sides of thorax very feebly margined, the whole insect 



parallel-sided ci/Iindrtis, Kiesw. (paraUelua, Thorns.) . 



B-The lateral tooth of the thorax well before the middle of the side. 



a-Shorter and broader, thorax strongly margined at sides... 



saginatus, Sturm. 



i-Narrower and slighter, t.horax less strongly margined. 



dentatus, Host. 



2-Tlie thickened part of the anterior angles of the thorax occupying only a 

 sixth or seventh of the sides. 

 A-The lateral tooth of the thorax before the middle of the sides, very 



j„(^ig,i„c, Seidell aim, Newm. {bicolor, Sturm.). 



B-Thc lateral tooth of the thorax in the middle of the sides, distinct. 

 a-Shorter, more convex, puncturation stronger; thorax more parallel 



sided, lateral tooth smaller umhratus, Er. {ruficomis, Reitt.). 



i-Longer and slighter, puncturation weaker ; thorax more contracted be- 

 hind, lateral tooth stronger dislinffuendus, Sturm. 



ii-Eyes with larger facets ; antennae somewhat slender, especially joints 6, 7 and 

 8, and r,th and 7th joints longer than broad ; anterior angles of thorax 

 reflexed and produced into a large hook-shaped tooth... acutangulus,Gy\\. 



