SOME NORTH AMERICAN INSECTS. 189 



obscurely subiridescent, subcylindric, the sides being almost parallel ; 

 not remarkably elevated ; behind the middle a much dilated, oblong 

 triangular, rather deeply indented line, extending to the base ; spines 

 acute, not much elongated: scutel rounded at tip: elytra with the striae 

 obsolete, the subsutural obvious: pectus with the lateral groove very 

 obvious : tibix and tarsi rufous ; penultimate tarsal joint produced 

 beneath into a dilated, obtuse lobe. — Length less than three-tenths of 

 an inch. 



The dilated, elongate triangular indentation, or dilated dorsal line, 

 extending from the undule to the base of the thorax, is probably some- 

 what similar to that of the capucmus, Ahrens; but the general form is 

 much more cylindric. 



11. E. clypeatus, S. {Elater c, Ann. Lye. N. Y., I., p. 266.). 



12. ^. amaenicornis. Black; antennae pectinate, second and third 

 joints, and feet rufous. — Inhab. Indiana and New Hampshire. 



Body small, black, densely punctured above and beneath : antennx 

 with a process on each joint excepting the three basal ones, black, the 

 second and third joints dull rufous : thorax convex, simple ; posterior 

 angles a little excurved, acute, without carinated line ; base without 

 fissures : elytra, third and fourth striae only half the length of the ely- 

 tra :feet rufous. — Length over three-twentieths of an inch. 



Resembles E. pygmaeus, Fabr., but the thorax is without indenta- 

 tion. I obtained two specimens in Indiana, and received one from Dr 

 Harris. 



1 1 1 Pectus canaliculate each side of the middle. 



13. E. triangularis, S. {Elater t., Journ. Acad. N. S., III.,p. 170.). 



Antennae, first joint slightly arcuated, obliquely truncate at tip ; se- 

 cond obconic, small, arcuated at base : thorax with an impressed line 

 behind the middle ; anterior margin piceous. 



It occurs in Indiana as well as Missouri. 



14. E. humeralis. Black,- elytra rufous at base. — Inhab. Indiana. 

 Body black, minutely punctured, and with minute hairs ;//'ow^ with 



an obsolete indented line : antennae rather hairy ; first joint slightly 

 arcuated, obliquely truncate at tip ; second obconic, arcuated at base ; 

 third shorter than the two following ones together ; remaining joints 



