June i 9 oo.] Casey: On North American Coleoptera. 131 



4 — Eyes nearly as in Tritoma ; body much smaller and more oval Litargus 



5 — Epipleurse flat and horizontal, not extending much behind the middle. 



Thrimolus 



All of these genera are common to the Atlantic and Pacific dis- 

 tricts, except the last, which has been taken thus far only in Texas. 



Tritoma Groff. 

 Mycetophagus Hellw . 

 The species are oblong-oval in form, moderately convex and clothed 



rather sparsely with short stiff reclined pubescence, the elytra generally 



ornamented with a pale design upon a darker ground ; they are 



moderately numerous and the American forms may be defined as 



follows : — 



Antenna; gradually incrassate toward tip, the outer joints sometimes feebly subserriform, 

 the pro thorax widest at base, with the sides more or less strongly convergent and 

 broadly arcuate thence to the apex, the two subbasal fovea; deep and distinct ; 

 body broadly oblong-oval. [Tritoma, in sp.] 2 



Antennae with a very feebly differentiated subparallel 5-jointed club ; prothorax but 

 little wider at base than at apex, more or less serrulate at the sides, much wider 

 near the middle, the sides strongly arcuate, the subbasal pits deep and distinct ; 

 body narrowly elongate-oval, the elytral intervals each with a series of semi-erect 

 hairs. [Ilendus, sg. nov. ] 8 



Antenna: with a feeble parallel 4-jointed club ; body shorter and moderately broadly 

 oblong-oval, the prothorax with the sides but feebly converging from the base and 

 broadly arcuate, the subbasal pits distinct. [Parilendus, sg. nov.] 11 



Antenna.' with a 3-jointed club ; body rather broadly oblong-elongate, the prothorax 

 widest before the base, with the subbasal pits feeble or obsolete. [Gratusus 

 sg. nov. ] 12 



2 — -Last joint of the antenna; elongate, distinctly longer than the two preceding com- 

 bined ; punctures rather coarse, not dense ; elytra blackish, with a large reddish- 

 yellow design involving the suture from fifth to three-fourths, extending obliquely 

 to the humeri, and, transversely at its posterior limit, nearly to the side margin, 

 the apices also yellow. Length 4.5-5.7 mm. ; width 2.2-2.6 mm. New York, 

 Indiana and North Carolina punctata Say 



Last joint of the antenna; shorter, never longer than the two preceding combined ; 

 body smaller in size 3 



3 — Elytral stria; impressed, strongly punctured and distinct almost throughout. At- 

 lantic regions 4 



Elytral striae scarcely at all impressed, very finely punctured and almost completely 

 obliterated behind the middle. Pacific coast 7 



4 — Pale design of the elytra somewhat as in punctata, involving the suture from 

 basal fifth or sixth to slightly behind the middle, extending obliquely to the 

 humeri, near which there is a projection from each side of the ramus, extending 

 obliquely outward also at its posterior limit to the middle of the width and with 



