408 CLAVICORNIA — SILPHIDAE. 



«. Thorax pubescent. 



I. Thorax red. 



BLack, with silky reflection ; thorax red, covered with 

 oolden-yellow hairs. Elytra uneven, with three raised, 

 curved longitudinal lines and a prominence behind middle. 

 L_ 6.i_ — 7 1. Rather common. S. thoracica, Lin. 



II. Thorax black. 



1. Antennae with eighth joint narrower than ninth. 

 A A, Elytra not pubescent. 



a a. Elytra with transverse wrinkles, sutural 



apical angle not produced in male. 



Black ; head, the uneven thorax and scutellum (except 



smooth prominences on two latter) thickly covered with 



close-lying gray hairs ; elytra with three raised lines and a 



little prominence behind middle. L. 4 — 4| 1. Common. 



S. rugosa, Lin. 



h b. Elytra not punctured in wrinkles, sutural 

 apical angle produced in male. 



Black; head, the uneven thorax (except some raised 

 spots) and the scutellum covered with close-lying gray 

 hairs ; elytra with three raised lines and a prominence 

 behind middle. L. 5 1. Common. S. sinuata, Fab. 



J5 JB. Elytra pubescent, closely at base, scantily 

 in other parts. 

 Brown-black ; head, thorax (except raised spots) scutel- 

 lum and base of elytra closely covered with brown hairs ; 

 rest of elytra scantily pubescent, sutural apical angle a 

 little produced in male. L. 5 1. Scarce. >S^. dispar, Herbst. 



2, Antennae with eighth joint as broad as ninth. 



Black ; npper-side with tolerably thick, close-lying gray 

 puljescence ; elytra witli three raised lines. L. 5 1. Mode- 

 rately common. aS'. opaca, Lin. 



h. Thorax not pubescent. 



I. Thorax straight or emarginate in front. 



1, Elytra with interstices transversely wrinkled. 

 Black, dull; head constricted behind eyes; thorax 

 evenly and extremely closely punctured; elytra strongly 

 punctured, with three raised lines (often very feeble), the 



