8o MEMOIRS ON THE COLEOPTERA. 



Not very closely allied to any other but approaching the sororella 

 type in sexual characters, the sixth male tergite having the median 

 projecting lobe truncate medially, nearly half as wide as the apex 

 between the lateral processes, the latter rather short and not pro- 

 jecting posteriorly behind the transverse line of the lobe, the lateral 

 ends of the median lobe not defined by tumid angles but nearly 

 flat and very broadly rounded. This species is also distinguishable 

 by its rather small size, unusually large head, short and broad pro- 

 thorax and long stout antennae, with the tenth joint shorter than 

 the ninth. 



Atheta (Stethusa) tuta n. sp. Slender, subparallel, feebly convex, 

 rather shining, dark testaceous, the head piceous; abdomen wholly 

 dark piceous-brown, the elytra very pale albido-flavate, slightly infu- 

 mate near the scutellum; fine punctures and pubescence as usual; head 

 well developed, slightly transverse, fully three-fourths as wide as the 

 prothorax, the eyes very large as usual; antennae long, heavy, distinctly 

 incrassate distally, blackish, pale basally, the second joint distinctly 

 shorter than the third, fourth fully as long as wide, ninth and tenth 

 mutually equal in length as usual and nearly as long as wide; prothorax 

 barely one-half wider than long, moderate in size, parallel, with rather 

 well and subevenly rounded sides, the ante-scutellar impression very 

 small, rounded and feeble; elytra nearly parallel, with straight sides, 

 a fifth wider and nearly a fourth longer than the prothorax; abdomen 

 narrower than the elytra, perfectly parallel. Length 2.5 mm.; width 

 0.45 mm. New York (Ithaca). 



Related only to sororella and having nearly similar male sexual 

 characters, the median lobe of the sixth tergite occupying fully 

 two-thirds of the space between the lateral spicules, which are rather 

 small, slender, externally arcuate and not projecting posteriorly 

 behind the line of the lobe; the lobe is feebly sinuate medially, 

 with its lateral ends broadly rounded, indefinite and not at all tumid. 

 It differs from sororella in its paler coloration, apparently not wholly 

 due to greater immaturity of the unique type, in its rather better 

 developed head, which is not so strongly narrowed at base, in its 

 much less transverse prothorax and longer, more parallel and more 

 albid elytra; the antennas, also, are longer, heavier and more distally 

 incrassate. As usual throughout the subgenus, the male antennae 

 bristle with longer hairs inwardly toward base, and the basal joint 

 of the hind tarsi is shorter than the second. 



