THE IIISTER BEETLES, 



605 



oo. Subhumeral striae wholly absent. 



p ^ p ex of prosternal lobe truncate ; epipleura with two strife ; 



length 5-5.5 mm. 1154. furtivus. 



pp Apex of prosternal lobe rounded; epipleura with three striae; 

 length 4-6 mm. 1153a. incertus. 



nn. Elytra with four entire strise ; outer thoracic stria abbreviated ; 

 form oblong ; length 4.5 mm. curtatus. 



1144 (3477). Hister harrisii Kirby, Fauna Bor. Amer., IV, 1837, 124. 

 Rounded-oval, convex. Surface sparsely and equally punctured. Tho- 

 rax with two stria?, the outer entire and slightly curved at base, the inner 

 often slightly the shorter. Elytra with four entire striae, fifth extending to 

 middle, sutural longer than fifth, subhumeral entire. Front tibiae with four 

 or five teeth, the apical shorter than the second. Length 4-5 mm. 



Lake, Laporte, Pulaski, Cass and Marion counties; frequent. 

 April 10-June 26. Occurs principally in cows' clung. Frequent 

 beneath chunks on beach of Lake Michigan. 



1145 (3479). Hister merdartus Hoffm., Ent. Hefte., I, 39. 

 Oblong-oval, convex. Thorax with two entire striae which usually unite 



at the base, the inner somewhat sinuous, a few sparsely placed punctures 

 along the sides. Elytra with four entire striae or with the fourth slightly 

 abbreviated at base, fifth and sutural extending to middle, subhumeral en- 

 tire, nearly straight. Front tibiae with four teeth, the apical one more 

 prominent than the second and slightly notched at tip. Propygidium rather 

 sparsely, pygidium more densely punctured. Notch of mesosternum deep 

 and broadly rounded. Length 5.5-7 mm. 



Throughout the State ; frequent, April 25-October 24. 



1146 (34S0). Hister interruptus Beauv., Ins., 1805, 180. 



Broadly ovate, convex. Thorax with two entire striae, not united at 

 base, the inner rarely sinuate, surface without punctures. Elytra with 

 three entire striae, fourth slightly abbreviated at base, fifth very short, su- 

 tural extending in front of middle. Pygidium rather finely and sparsely 

 punctured. Front tibia? with five teeth, the apical one shorter than the 

 second and bifid. Notch of mesosternum broad but very shallow. Length 

 5.5-7 mm. 



Common beneath rubbish along the beach of Lake Michigan ; 

 taken elsewhere only in Vigo County, where it is scarce. May 6- 

 October 11. 



1146a (3482). Hister interruptus immunis Erichs., Kl. Jahrbuch, 1834, 

 143. 



Close to interruptus and, in my opinion, only a variety of that species. 

 Differs by being shorter and proportionally broader, and by having the su- 

 tural stria very short or often entirely obsolete. Front tibia- with five sub- 

 equal teeth. Length 5-6 mm. 



