10
Memoirs on the Coleoptera.
| Atheta (Macroterma) iowensis n. sp.—As small as dentata and relatively narrower and more parallel, the antennæ much larger, stouter and more incrassate, the eleventh joint less acutely pointed; black, the elytra and legs pale piceo-flavate; antennæ blackish throughout; head distinctly narrower than the prothorax, the eyes less prominent than in dentata; prothorax parallel, evenly rounded at the sides, finely punctuate and moderately pubescent; elytra large, slightly transverse, with feebly diverging sides, distinctly wider and very much longer than the prothorax; abdomen moderately narrow; parallel, the fifth tergite (♂) with a very small and sharply elevated tubercle close to the hind margin and more posterior in position than the somewhat similar tubercle of dentata, the sixth tergite with a slightly projecting and broadly arcuate apical lobe, about a third as wide as the basal width of the segment, the lobe with two short carinæ separated by a concavity at each side of its surface, the median part more arcuate and with a minute median sinus at apex, the segmental apex at each side of the lobe unevenly crenulate and wrinkled. Length 2.7 mm; width 0.7 mm. Iowa (Iowa City),—Wickham. |
The specimens at hand are gummed alongside of a large black ant, having the pedunculated abdomen relatively very stout, but it is hardly assumable that the beetle and ant are associated very closely.
Homalotusa Csy.
This subgenus, composed of rather large species with long and not much incrassated antennæ, in which the outer joints are more or less elongate, the eleventh much shorter than the two preceding combined, the mesosternal process extending almost to the middle of the coxæ and very acute, the metasternal projection very short and broadly angulated, the coxæ contiguous, the abdomen parallel and devoid of evident sexual modification, may be placed near Liogluta. The following are some additional species:
| Atheta (Homalotusa) lanei n. sp.—Unusually stout, piceous-black, the abdomen black, legs pale, the antennæ fuscous; pubescence distinct but not dense, rather pale, very sparse on the abdomen; lustre shining; head transversely orbicular, the strongly setose eyes not very prominent, at their own length from the base; antennæ extending to the middle of the elytra, the tenth joint slightly elongate; prothorax nearly a third wider than long, much wider than the head and correspondingly narrower than the elytra, parallel, with rounded sides, rather convex, minutely, sparsely punctulate but flattened and with closer granuliform punctures medially toward base, with a short transverse impression just before the base; elytra large, slightly wider than long, very much wider and longer than the prothorax, impressed on the suture basally, rather closely, granularly punctate; abdomen slightly narrower than the elytra, remotely punctulate, the fifth tergite fully as short |
