HlSTERID^E 221 



unequal, the apical large, the basal minute. Length 4.7 mm.; width 

 3.7 mm. Michigan (Ionia). 



The type of this species in pale rufo-testaceous in color throughout, 

 undoubtedly the result of immaturity, though the integuments are 

 solid. It belongs near depurator but is much smaller and more 

 abbreviated. 



The following species, by reason of the short outer thoracic stria 

 of the preceding and the notably remote pygidial sculpture may be 

 placed near curtatus and incertus in the lists: 



Hister lacustris n. sp. Form much narrower and more oblong than in 

 in either of the preceding, oblong-suboval, moderately convex, shining 

 and everywhere with fine sparse feeble punctulation; head with the fine 

 punctulation rather close-set, the stria entire; prothorax much less than 

 twice as wide as long, the moderately converging sides only feebly arcuate, 

 rounding strongly at apex; outer stria very short, not extending to the 

 middle and rather distant from the sides, the inner somewhat sinuous 

 and not attaining the base, fine; elytra scarcely one-half longer than the 

 prothorax, the sides moderately arcuate, the three entire striae not very 

 coarse but unusually deep, the fourth present from near the base to well 

 behind the middle, the fifth represented by a short dash just behind the 

 middle, the sutural distinct from the middle to near the apex; humeral 

 wholly obsolete, the subhumeral' present in a very short feeble dash near 

 basal third, the oblique humeral extremely fine; propygidium with no- 

 tably fine and very remotely scattered punctures, the pygidium convex 

 and polished, with excessively minute sparse punctulation, becoming 

 evident fine sparse punctures basally; prosternal lobe rather narrowly 

 rounded, with a rather wide entire marginal bead; mesosternal sinus 

 abruptly formed and distinct, only moderately deep, fully three times as 

 wide as deep; anterior tibiae with the three teeth small, rather feeble antl 

 subequal. Length 4.8 mm.; width 3.4 mm. Michigan (Marquette), 

 Sherman. 



I do not know of any species with which to compare this closely 

 and it seems to be rather isolated in its relationships, though as 

 stated above, it may be placed near curtatus. It is represented by a 

 single specimen of undetermined sex. 



Group Servus. 



The species of this group are small or moderate in size, intermediate 

 in many of their characters between the depurator and americanus 

 groups, especially in the extremely feebly sinuate mesosternum, but 

 they are decidedly isolated as a group by the bistriate prosternum. 

 I have proceeded under the assumption that the true West Indian 



