154 SUBFAMILY X. CURCULIONIN^S. 



separable by the form of the elytral tips arid the different impres- 

 sion of the last ventral. 



KEY TO SPECIES OF GROUP I. 



a. Subapical callus of elytra distinct, more or less prominent. 

 1). Tips of female elytra separately prolonged into a cylindrical process; 



length 7 8 mm. 



c. Beak nearly cylindrical, not or feebly carinate; thorax as wide as 

 long. 195. TUBEBOSUS. 



cc. Beak distinctly carinate and feebly sulcate above; thorax one- 

 fourth wider than long. 196. SOBDIDUS. 

 l>b. Tips of female elytra separately subacuminate, not prolonged; length 



8.511 mm. 



(1. Humeri rounded, base of elytra feebly emarginate; last ventral 

 of female with two elevated folds near tip. 197. SQX*AMK;ER. 



dd. Humeri oblique, base of elytra deeply emarginate, their sides 

 paler than disc; last ventral of female with large rounded me- 

 dian impression. 198. CALLOSUS. 

 aa. Subapical callus of elytra indistinct, not at all prominent. 



e. Elytra obliquely declivous behind; female with vertical edge of 



fifth ventral not foveate. 

 /. Sides of thorax feebly rounded. 



g. Humeri rounded; female with elytra separately prolonged at 

 tip into straight tapering processes and fifth ventral with lobes 

 exactly as in squamiger; length 7 10 mm. 



199. IN^EQUALIPENNIS. 



gg. Humeri oblique; female with apical processes of elytra cylin- 

 drical, converging at tip, and fifth ventral broadly but feebly 

 concave; length 10 12 mm. 200. CATTDATUS. 



ff. Sides of thorax strongly rounded; length 7.5 mm. 



201. ROTVXniCOLLIS. 



ee. Elytra compressed and vertical behind; female with margin of fifth 

 ventral bifoveate each side of median apical notch; length 14 mm. 



202. AMEBICANUS. 



195 (8441). LISTRONOTUS TUBEROSUS Lee., 1876, 130. 



Black, densely clothed with brownish-yellow and cupreous rounded 

 scales, which are larger on thorax and hair-like on head; thorax with 

 three more or less distinct pale stripes; scutellum pale; elytral scales uni- 

 form in color; hind thighs with pale band. Beak stout, its carina? and 

 grooves very faint, frontal fovea feeble. Thorax with sides nearly parallel, 

 disc densely punctate. Elytra at base broadly emarginate, htimeri oblique; 

 posterior callus large, conical, prominent; striaB punctate, intervals wide, 

 nearly flat, their seta; very short. First ventral of male flattened at base, 

 anal segment protuberant beyond the fifth, elytra rounded at tip. Last 

 ventral of female feebly impressed near tip; each elytron prolonged at tip 

 into a long, straight but convergent process. Length 7 7.5 mm. 



Laporte and Marion counties, Indiana, scarce ; June 9 Sept. 

 ir>. Taken from the margins of ponds and along the beach of Lake 



