THE CLICK BEETLES. <47 



Kosciusko, Vigo, Orange and Posey counties; frequent. May 

 31- June fi. This species occurs in collections under the name coiii- 

 cinus, but is very distinct in size, length of male antennn? and 

 punctuation of thorax, from that species as above described. 



1411 (4336). MELANOTUS AMERICANUS Ilbst, Kafer, 10, 1800, 74. 

 Elongate-oblong, slender. Dull reddish-brown, sparsely pubescent with 



grayish hairs. Second and third joints of antenna? short, subequal, together 

 about equal to fourth. Thorax not longer than wide, distinctly narrower 

 at apex than base, sides feebly rounded on apical half; disk finely and 

 sparsely punctate, with a faint median impression on basal third. Elytra 1 

 strife very feebly impressed with large oblong punctures; intervals finely 

 and sparsely punctulate. Length 7-9 mm. 



Throughout the State; frequent. April 27-August 11. The 

 thorax is more convex and rounded on sides in female than in male. 



1412 ( ). MELANOTUS CRIBRIVENTRIS sp. nov. 



Elongate, rather robust. Uniform piceous, sparsely clothed with gray- 

 ish pubescence; antenna? and legs reddish-brown. Antenna? slender, reach- 

 ing basal fourth of elytra, second and third joints subglobular, subequal, 

 together one-third shorter than fourth. Clypeus feebly concave, coarsely 

 punctate, its front margin rounded. Thorax slightly longer than wide, 

 sparsely and rather finely punctate; disk with a distinct median impression 

 on basal two-thirds; hind angles rather short, scarcely divaricate, strongly 

 cariuate. Elytra very slightly tapering from the base, the punctures small, 

 close-set; intervals smooth or nearly so. Length 10-11 mm. 



Kosciusko County; rare. July 11. 



GROUP B. 



In this group the third antermal joint is always fully one-half 

 longer than second and sometimes more than as long again. The 

 following species, except one, are represented in the collection at 

 hand : 



KEY TO SPECIES OF GROUP B. 



a. Hind angles of thorax with two carina?, the inner one much less dis- 

 tinct than the outer. 

 7). Thorax with a more or less distinct median impressed line. 



c. Fourth joint of antenna 1 nearly or quite double the length of third; 

 thorax slightly longer than wide; last ventral of male distinctly 

 tumid or convex at middle; larger, 15 or more mm. 



1413. DECUMANUS. 



<<: Fourth joinl of antenna' but little if any longer than third; thorax 

 not longer than wide; smaller, not over 14 mm. 



1414. COMMUNIS. 

 ,&&. Thorax without a median impressed line. 



