1 92 MEMOIRS ON THE COLEOPTERA 



in width to the adjacent pale vitta. Head and prothorax both rela- 

 tively smaller and more shining; neck narrower, the prothorax 

 distinctly less than twice as wide as long; elytra shorter, barely a 

 fourth longer than wide, the external stride stronger and more evi- 

 dently punctate, the broad sutural vitta bifurcating only in basal 

 third; legs more slender, deep black throughout, the femora very 

 pale, black at tip. Length 5.8-6.0 mm.; width 2.65 mm. Indiana. 



debiliceps n. sp. 



5 Body smaller and rather narrower than in any of the preceding species 

 but otherwise similar, the legs and antennae colored as in furcata; 

 head nearly smooth, just visibly narrower than the prothorax, the 

 eyes large and prominent; prothorax not quite twice as wide as 

 long, the sides abruptly reflexed; elytra smooth, with feeble impunc- 

 tate striae, the sides more rounding or more gradually converging 

 behind, not a third longer than wide, the sutural vitta as wide as the 

 adjacent pale vitta, bifurcating in basal third, the basal part of the 

 two arms more rapidly inflated than in any other of the group. 

 Length 5.6 mm.; width 2.25 mm. Texas (Brownsville), Wickham. 



amnicola n. sp. 



I think there can be but little doubt of the specific value of any 

 of these forms; the constancy of elytral ornamentation is parallel 

 to that prevailing in a large group of the genus Disonycha. 



