64 MEMOIRS ON THE COLEOPTERA. 



greatly in being swollen basally, so that the rounded tempora are more 

 prominent than the eyes, which are convex and unusually large, being at 

 their own length from the base; carinae as usual and very far from entire, 

 the antennae as in that species but larger, similarly rather strongly and grad- 

 ually incrassate distally, the proportions of the basal joints similar and dif- 

 fering greatly from the unigena type; prothorax much less transverse than 

 in validiceps, widest anteriorly, the sides much more converging thence to 

 the obtuse basal angles, as wide as the base of the elytra and only just visibly 

 wider than the head, the median line very finely, feebly impressed; elytra 

 nearly similar and with slightly diverging straight sides, the suture about a 

 fourth longer than the prothorax; abdomen narrower than the elytra, rather 

 long, the sides perfectly straight and parallel, not converging apically, the 

 posterior tergites similarly longer than the three basal; metasternum behind 

 the coxae very short and broadly, feebly parabolic. Length 1.8 mm.; width 

 0.38 mm. Rhode Island (Boston Neck). 



Differs greatly from validiceps, though having the head unusually 

 developed, in that the latter is inflated basally, more transverse 

 and with much laiger eyes; it also differs much in the size and form 

 of the prothorax and in its longer and more parallel abdomen. 



Atheta (Hilara) sejuncta n. sp. Form, sculpture, lustre and coloration 

 nearly as in libens, the head being large but not so transverse and less inflated 

 basally, almost as long as wide, with the very shallow variolate spaces about 

 the erect sparse hairs better developed; eyes convex, as long and almost 

 as prominent as the rounded tempora, the carinae unusually long, almost 

 entire; antennae similar in general type but only very slightly incrassate, 

 notably more slender and with less transverse joints distally than in libens, 

 and differing also in having the third joint more elongate and only scarcely 

 visibly shorter than the second, not much shorter as it is in libens; prothorax 

 shorter and more transverse, much more parallel and subevenly, moderately 

 arcuate at the sides throughout, slightly narrower than the base of the elytra 

 and just visibly wider than the head, the fine impressed median line subob- 

 solete; elytra nearly similar but with the suture relatively much longer, 

 being about one-half longer than the prothorax; abdomen much narrower than 

 the elytra, feebly narrowed apically, shorter than in libens and much more 

 nearly resembling that of validiceps. Length 1.63 mm.; width 0.35 mm. 

 Rhode Island (Boston Neck). 



In common with libens, this species differs from validiceps very 

 radically in its basally inflated head and very much larger eyes; 

 from libens it differs in it? less incrassate antennae, with a notably 

 more elongate third joint and shorter and less parallel abdomen, in 

 which, as well as in the form of the prothorax, it much more closely 

 resembles validiceps. It is rather singular that I should have col- 

 lected what seem to be five distinct species of this subgenus, in- 

 cluding pennsylvanica, upon a plot of less than one hundred acres 

 in Rhode Island. 



