42 . STERNOXI — ELATERIDAE. 



Black ; elytra browni.sh-yellow, apex black ; head and 

 thorax covered with yellow pubescence. L. 4 — A^ 1. Kare. 



C. castaneus, Lin. 

 II, Antennae as long as head and thorax^ strongly 

 sawlike in both sexes. 



Metallic-brown, with violet or bronze reflection ; pubes- 

 cence rather strong, closelying, gray, usually cloucled in 

 parts. L. 6 — 7 1. Scarce. C. tessellatiis, Lin. 



b. Second joint of antennae conical. 



Narrow, parallel-sided. Black ; somewhat leaden ; elytra 

 and legs sometimes lighter ; pubescence short. Antennae 

 feebly sawlike. Head closely and strongly punctured ; 

 thorax much longer than broad. L. 3| — 4 1. Eather 

 common. C. quercits, Gyll. 



The variety C. ochropterus, Steph., has the elytra pale 

 red-yellow or ochre-yellow, legs pitch-black, with tibiae 

 paler and antennae black. 



JS, Third joint of antennae much narrower than fourth. 



a. Seams beneath thorax double ; upper-side thickly 

 covered with cloudy, silky pubescence. 



Dark brown ; legs lighter. Thorax about as long as 

 broad, posterior angles not projecting outward. L. 4| 1. 

 Common. C. holosericeus, Fab. 



h. Seams beneath thorax simple ; upper-side with scanty 

 or no pubescence. 



Thorax about as long as broad, posterior angles projecting 

 outward ; antennae feebly sawlike. 



X. Elytra black, bluish or bronze. 



1, Upper-side without pubescence. 



Eather broad. Black, violet, bluish or bronze ; legs some- 

 times red, interstices on elytra flat. L. 5 — 7 1. Eather 

 common. C. aencus, Lin. 



2. Upper-side with scanty pubescence. 



A A, Thorax rather shiny, without central furrow. 



Brown, with greenish-bronze reflection ; legs red ; pubes- 

 cence rather coarse, very short, golden-yellow. Sides of 

 thorax slightly rounded ; elytra scarcely broader than 

 thorax, interstices flat. L. 5 1. Not common. 



U. mctallicus, Payk. 



