756 FAMILY XXXVII. ELATER1D2E. 



almost obsolete at the middle. No synopsis of the 30 or more spe- 

 cies listed from the United States has been published. They begin 

 to reach maturity in May and are most common from then until 

 about August 1, when they mostly disappear. 



KEY TO INDIANA SPECIES OF LIMONIUS. 



a. Clypeus strongly and deeply emarginate in front ; head and thorax 

 rather densely covered with golden yellow hairs. 1434. aukipilis. 

 aa. Clypeus not, or broadly and shallowly, emarginate in front. 



&. Legs and antenna? black ; thorax brilliant metallic purple, very 

 sparsely pubescent. 1435. aurifer. 



bl). Legs and antennae reddish-brown or piceous ; thorax more or less 

 densely pubescent, not metallic, 

 c. Hind angles of thorax distinctly produced and rather strongly 

 carinate. 



d. Color dull sooty brown ; length 9 or more mm. 



e. Front of clypeus broadly emarginate, indistinctly margined in 

 the middle. 



f. Form slender ; antenna? distinctly paler than the body, the 



third joint notably longer than the second ; thorax longer 

 than broad, its hind angles straight and median impressed 

 line indistinct ; smaller, 10-14 mm. 1436. griseus. 



ff . Form broader ; antenme fuscous or sooty brown, the third 

 joint scarcely longer than second; thorax as broad as long, 

 hind , angles slightly but evidently divergent, median im- 

 pressed line distinct ; larger, 12.5-17.5 mm. 



1437. INTERSTITIALIS. 



ee. Front of clypeus broadly rounded or truncate, not emarginate, 

 distinctly margined. 



g. Clypeus rounded in front ; antennae entirely black ; thorax 



with a median impressed line. 1438. confusus. 



00- Clypeus truncate in front ; antenna) with basal joints red- 

 dish ; thorax without median impressed line. 



1439. PLEBEJUS. 



dd. Color black ; length not over 7.5 mm. 



h. Second and third joints of antennae together longer than fourth ; 

 hind angles of thorax not paler. 1440. quercinus. 



hh. Second and third joints of antennae small, rounded, together 

 distinctly shorter than fourth ; hind angles of thorax pale 

 reddish-yellow. 1441. basillaris. 



cc. Hind angles of thorax short, scarcely produced, feebly and indis- 

 tinctly carinate. 



i. Elytra uniform sooty brown or piceous ; length 9-11 mm. 



AGONUS. 



ii. Elytra bicolored, piceous and dull reddish-brown ; length 5- 



6.T5 mm. 1442. ornatipennis. 



1434 (4348). Limonius auripilts Say, Journ. Phil. Acad. Nat. Sci., Ill, 

 1823, 172 ; ibid. II, 112, 602. 

 Elongate-oblong. Piceous black ; head and thorax densely, elytra sparse- 

 ly, clothed with yellow hairs; basal joint of antenna?, legs, narrow basal 



