SITONES. 235 



long, deeply punctured, constricted toward apex, sides 

 evenly rounded, anterior margin raised ; elytra two and a 

 half times as long as thorax, with fine punctured striae, in- 

 terstices flat, with erect bristles behind. L. 3 1. Common. 



S. regensteinensis, Herbst. 



X). Thorax moderately rounded at sides ; elytra with sides 

 nearly parallel and apex regularly rounded ; eyes only 

 slightly prominent. 



a. Elytra oval ; length 3 lines. 



Black, closely covered with brown or gray scales ; thorax 

 rather long, finely punctured, posterior angles slightly 

 prominent, with sides and central line pale, and two, four 

 or six varied pale dots on disc ; base of antennae, tibiae 

 and tarsi dull-red. Common. S. puncticollis, Steph. 



6. Elytra oblong ; length 2 lines. 



Black ; antennae, tibiae and tarsi rust-red ; upper-side 

 with giuyish-silvery scales ; thorax with three straight 

 lines, elytra with alternate interstices whitish. Thorax 

 broader than long, broadest behind, very finely punctured. 

 Common. >S'. lineatus, Lin. 



JE. Thorax moderately rounded at sides ; elytra with 

 parallel-sides, apex somewhat pointed ; eyes flat. 



a. Elytra with erect bristles. 



Oblong-ovate. Black; under-side closely covered with 

 gi-ay, upper-side with brown scales, thorax with a fine cen- 

 tral line and broad, somewhat curved lateral lines of grayish- 

 white scales ; elytra variegated with gray and with rows of 

 erect white bristles. Thorax broader than long, deeply 

 and diffusely punctured, rather strongly dilated in middle 

 of sides ; elytra scarcely half as long again as together 

 broad, with deep punctured striae. L. If — 2 1. Common. 



S. hispidiUus, Fab. 



h. Elytra without erect bristles. 



I, Forehead with a feeble, narrow furrow. 



Elongate. Black, more or less closely covered with cop- 

 pery and brown, or gray and silvery scales ; antennae red- 

 yellow at base ; base and apex of femora, the tibiae and 

 tarsi red-yellow. Head narrow ; thorax as broad as long, 

 very closely and finely punctured ; elytra elongate, gene- 



