Coleopterological Notices, V. _ 539 



these striae. The lateral line of fine punctures seems to become 

 obsolete in depurator and its allies, and in that group the two or 

 three fine marginal punctures of the pronotum are also obsolete. 

 The meaning of these singular punctures is difficult to state, unless 

 they be the remains of tactilo-setigerous pores. 



The following species are assigned for convenience to the groups 

 adopted by Dr. Horn : — 



Group Arcuatus. 



Margins of the prothorax fimbriate ; anterior tibise dentate. 



H. semirillier n. sp. — -Stout, oblong and convex, resembling sellatus. 

 Head minutely, obsoletely punctulate, the frontal stria entire ; mandibles 

 minutely, sparsely punctulate. Prothorax fully twice as wide as long ; sides 

 moderately convergent, broadly, almost evenly arcuate from base to apex ; 

 marginal stria fine but distinct, entire ; outer lateral entire, inflexed at apex, 

 receding from the edge behind ; inner lateral strong, nearly entire, somewhat 

 uneven, the space between the two with one or two short strioles anteriorly ; 

 disk subirapunctate, with a short deep stria before the scutellum. Scutellum 

 equilateral, feebly impressed. Elytra rather less than one-half longer than 

 the prothorax, and, at basal third, quite distinctly wider ; apex obliquely 

 arcuate, four-fifths as wide as the base ; inflexed flanks coarsely bisulcate ; 

 outer subhumeral stria obsolete behind, but represented by a short deep stria 

 near the extremity of the oblique humeral, which is fine ; inner subhumeral 

 feebly indicated by a few subobsolete punctures near the first dorsal ; first 

 three dorsals entire ; fourth represented by a short distinct stria at base and 

 a few subobsolete punctures at apex ; fifth and sutural entirely wanting, 

 sometimes rudimentary near the apex. Propyyidhni remotely coarsely and 

 variolately punctate toward the sides, subimpunctate toward the middle be- 

 hind ; pygidium sparsely, feebly punctate, the punctures becoming larger and 

 clos r but shallow near the anterior angles. Prosternal lobe finely margined ; 

 posterior process spatuliform, received in the deep median emargination of the 

 mesosternum. Anterior tibiae strongly bidentate, the apical tooth feebly 

 bilobed ; posterior confusedly spinose externally, remotely so toward base. 

 Length 6.0 mm. ; width 4.5 mm. 



Utah (southwestern). Mr. Weidt. 



Allied closely to sellatus, but differing in the form of the marginal 

 stria of the mesosternum, which in sellatus evenly follows the rounded 

 outline of the median emargination ; in the present species it is pos- 

 teriorly and acutely angulate at the emargination ; it also differs in 

 its much sparser and finer pygidial sculpture especially along the 

 anterior margin, and in the presence of a distinct impressed appen- 



