SILPIIA. 409 



outermost one strongest and ending in a prominence, inter- 

 stices transversely wrinkled, L. 5} 1. Not very common, 



S. reticulata, Fab, 

 2, Elytra with interstices not wrinkled. 



A A, Elytra yellow-brown, with two round 

 black spots on each. 



Black ; head constricted behind eyes ; sides of thorax 

 and the elytra (except two round black spots on each of 

 latter) yellow-brown. L. 6 — 7 1. Moderately common. 



aS'. quadripunctata, Lin. 

 B B, Elytra black. 



ii a. Thorax with a crescent-shaped impres- 

 sion on each side ; each elytron with three 

 indistinct raised lines. 



Deep black, somewhat shiny; anterior margin of thorax 

 scarcely raised ; interstices on elytra punctured. L. 6 1. 

 Bather common. S. nigrita, Creutz, 



b h. Thorax without impressions ; elytra with 

 three distinct raised lines. 



A a. Interstices on elytra closely granu- 

 lated. 



Black, dull ; elytra flat. Head not constricted behind 

 eyes. L. 7 1. Eather common. *S'. tristis, lU. 



B b. Interstices on elytra rather coarsely 

 punctured. 



Black, only slightly shiny ; head not constricted behind 

 eyes ; all margins of thorax equally raised. L. G — 7 1. 

 Common. S. obscicra, Lin. 



ZI, Tliorax semicircular. 



1. Elytra without wrinkles and without raised 

 lines. 



Black, shiny ; elytra very closely punctured. Antennae 

 long ; mandibles prominent. L. 5 — 7-^ 1. Common. 



S. laevigata, Fab. 



2, Elytra punctured in wrinkles, with three raised 

 lines. 



Black, shiny ; thorax very closely punctured. Antennae 

 long ; mandibles prominent ; sutural raised line on elytra 

 longest. L. 4 — 5 1, Common. S. atrata, Lin. 



