40 STERNOXI — ELATERIDAE. 



angles nearly right angles, not ridged. L. 5 — 6| 1. Com- 

 mon. A. haemorrhoidalis, Fab. 



2, Third joint of antennae only slightly, or not at 

 all longer than second. 



Very similar to A. haemorrhoidalis, but rather broader. 

 Black or dark brown; margins of thorax, elytra (except 

 margins), under-side (except metasternum and base of 

 abdomen), and antennae often brownish-yellow ; legs 

 always lighter or darker brownish-yellow, femora at most 

 slightly darker. L. 4 — 5| 1. Kather common. 



A. vittatus, Fab. 

 &. Second to fourth tarsal joints gradually diminisliing 

 in length, all distinctly dilated. 



I. Third joint of antennae scarcely longer than second. 



Lighter or darker brownish-yellow ; head, disc of thorax, 

 breast and base of abdomen blackish or dark brown. Fore- 

 head scarcely impressed ; thorax diffusely punctured on 

 disc, rather more closely at sides ; posterior angles nearly 

 right angles, not ridged; antennae feebly sawlike. L. 3 J — 

 4 1. Kare. A. suhfuscus, Miill. 



II, Third joint of antennae distinctly longer than 

 second. 



Brown-red, only slightly shiny ; elytra with suture and 

 outer margin narrowly, and a streak from shoulder to apex 

 yellowish-red. Forehead strongly impressed ; thorax longer 

 than broad, strongly and not very closely punctured, pos- 

 terior angles not ridged ; elytra with punctured striae ; 

 antennae feebly sawlike. L. 4|^ 1. Rare. 



A. difformis, Lac. 



a. Thorax with a more or less distinct central furrow and 

 a depression on each side at base. 



a. Antennae feebly sawlike, third joint reversed conical, 

 without sharp inner angle ; fourth tarsal joint very 

 much smaller than third. 



Dull. Head and thorax black, sides of latter lighter ; 

 elytra yellow or yellow-brown, with outer margin (male) or 

 outer margin and inner-side (female) blackish ; under-side 

 black, abdomen (especially margins of segments), tibiae and 

 tarsi more or less brown. Forehead impressed ; central 

 furrow on thorax abbreviated and feeble, punctuation very 



