224 MEMOIRS ON THE COLEOPTERA 



similar in cribricauda but the fifth and sutural are more developed. 

 In cribricauda the outer thoracic stria is about as long as the inner. 

 The mesosternal sinus is deeper in sternalis than in either of the 

 species mentioned. 



Four other American species also belong to this group, all having 

 two entire striae on the inflexed elytral flanks indistinctus Say, of 

 the Carolinas, having strongly, somewhat closely punctate propy- 

 gidium, finely, rather loosely punctate pygidium, subentire outer 

 pronotal stria and four strong entire elytral striae; defectus Lee., 

 having the pygidia sparsely punctate, the pygidium very minutely, 

 and four entire and equal elytral striae, of the Atlantic regions; 

 fungicola Schf., having three entire striae and the basal part of a 

 fourth, with very sparsely punctate pygidia, described from New 

 Jersey, but also taken by Manee at Southern Pines, North Carolina, 

 the last two having abbreviated and subapical outer thoracic stria, 

 and the following more southern species, allied to defectus: 



Hister nanulus n. sp. Small, broadly oblong-oval, convex, polished, 

 deep black, the upper surface devoid of evident punctulation; head with 

 entire subcircular stria and with a small central fovea on the vertex; 

 prothorax short, twice as wide as the median length; sides rather strongly 

 converging and feebly arcuate, more rounded at apex; surface smooth, 

 the punctures of the basal series fine, obsolete in lateral fourth; outer 

 stria apical, midway between the fine entire inner stria and the sides; 

 disk with two or three small impressions near each side medially; elytra 

 rather transverse, with strongly arcuate sides, the entire dorsals rather 

 fine, the fourth very fine and feeble, disintegrated posteriorly, continuous 

 basally, the fifth wholly wanting, the sutural subentire, not quite at- 

 taining base or apex; humeral stria wholly wanting, the subhumeral 

 represented by a fine dash near basal third, the oblique humeral fine 

 but evident; propygidium with rather large but extremely shallow and 

 remotely scattered punctures, the pygidium small, convex, with fine 

 sparse punctures; prosternal lobe not beaded, the two striae distinct; 

 mesosternal sinus extremely feeble; anterior tibiae tridentate, the distal 

 tooth finely, unequally bifid. Length 3.0 mm.; width 2.2 mm. Florida. 



Allied to defectus but smaller, with shorter prothorax, very feeble 

 fourth stria and subentire sutural. In the nature of the fourth stria 

 it resembles fungicola somewhat, but the prothorax is much shorter, 

 the sutural stria still more developed and the pygidium is smaller. 

 This is the smallest true Hister known to me. 



