708 FAMILY XXXVII. ELATEEID^E. 



ff. Thorax with a distinct though fine carina in front of scu- 

 tellum, without median impressed line, the sides parallel 

 or slightly wider in front. 1338. TKIANGULARIS. 



ee. Episterna of metathorax broad and parallel ; disk of thorax 

 deeply impressed at middle. IMPRESSICOLLIS. 



cc. Thorax with raised line reaching the middle ; antennae of male pec- 

 tinate; posterior supplementary carina entirely wanting. 



1339. PECTINATUS. 



1335 (4049). MICEORHAGUS HUMERALIS Say, Trans. Amer. Phil. Soc., VI, 



1836, 189; ibid. II, 028. 



Cylindrical, moderately robust. Piceous, subopaque; elytra reddish at 

 base; antennae and legs reddish-brown. Antennre half as long as body and 

 serrate, male, shorter and not serrate, female. Thorax longer than wide, 

 sides parallel, curved near front angles ; hind angles short, carinate ; disk 

 with a faint median line, coarsely, densely and roughly punctate. Elytra 

 vaguely striate, intervals slightly convex, surface punctured like thorax. 

 Length 4-6 mm. 



Posey County; rare. June 26. Probably throughout the State. 

 The extent of red at base of elytra varies from a narrow space to 

 one third or more. The front and hind margins of the thorax are 

 often reddish. 



3336 (10,029). MICRORHAGUS BONVOI'LOIRI Horn, Trans. Amer. Eut. Soc., 



XIII, 1886, 35. 



Moderately elongate, rather slender. Piceous black, moderately shin- 

 ing; antennae, tibiae and tarsi reddish-brown. Antennae more than half the 

 length of body, slightly serrate in the male. Thorax as long as wide, sides 

 parallel, rounded near the front angles, hind angles cariuate; surface 

 coarsely, densely and roughly punctured. Elytra vaguely striate, punc- 

 tures as on thorax but less dense. Length 3-4.5 mm. 



Kosciusko County; scarce. July 11. Smaller and more slender 

 than humeralis, and with a longer thorax. 



1337 (4051). MICRORHAGUS IMPERFECTUS Lee., Proc. Phil. Acad. Nat. Sci.. 

 VI, 1852, 48. 



Elongate-oblong. Dark reddish-brown or piceous, feebly shining; an- 

 tennae and legs reddish-brown, the tarsi paler. Thorax as long as wide, 

 sides parallel behind, curved at apical third ; disk coarsely but not densely 

 punctured, with a median impressed line on basal half. Antennal groove 

 deep, the outer carina reaching barely more than one-half from apex to 

 base. Elytra substriate, coarsely and rather closely punctured. Length 

 5-5.5 mm. 



Vigo and Jefferson counties; rare. June 7-July 15. One of 

 the two specimens at hand was taken from the leaves of milkweed. 

 Both have a distinct rounded fovca on each side of thorax near the 

 middle. 



