Juneigoo.] CaSEY : On NORTH AMERICAN CoLEOPTERA. 137 



ing in the female, and the labrum is larger than in any other species, ex- 

 tending to the extreme limits of the epistomal truncature. lnfulatus 

 of LeConte, I have not seen ; it is said by Horn to be a synonym 

 of balteatus. 



Thrimolus, gen. nov. 



This genus is composed of a single exceedingly minute species, 

 differing radically from those which precede in the broadly rounded 

 basal angles of the prothorax. The body is oblong-oval, moderately 

 convex, clothed rather sparsely with coarse and moderately long re- 

 clined hairs, with other longer erect setae serially bristling from the 

 elytral flanks. The head is large, transverse and well developed, the 

 eyes moderately large, basal, not very prominent, somewhat trans- 

 versely oval, entire and much less coarsely faceted than usual ; the 

 clypeus is rather short and broad, with the suture transversely rec- 

 tilinear, not impressed and very feeble. Antennae moderate in length, 

 1 1 -jointed, with a compactly cylindric stout and 3-jointed club, the 

 joints six to eight gradually increasing in width and decreasing in 

 length, the latter as wide as the base of the club. Prothorax broadly 

 arcuate and very finely beaded at base. Scutellum well developed, 

 broadly subtriangular or parabolic. Anterior coxae large, obliquely 

 suboval, very convex and narrowly separated. Basal segment of the 

 abdomen as long as the next two combined ; two to four relatively 

 shorter than usual and gradually diminishing somewhat in length, the 

 hind coxae very narrowly separated. Legs slender, coarsely, sparsely 

 herissate with moderately long hairs, the tarsi extremely slender, fili- 

 form, much shorter than the tibiae, with the basal joint but little longer 

 than the second, normally 4-jointed throughout, the claws small and 

 very slender ; tibial spurs small and much less developed than usual. 



The antennae are bilaterally symmetric, shorter and more compact 

 than in Typhcea and the elytral punctures are altogether irregular in 

 distribution. The type may be briefly defined as follows : — 



Body dark luteo-testaceous in color throughout, the legs and antennae still paler, the 

 club of the latter very feebly infuscate, shining ; head. and pronotum subimpunc- 

 tate, the latter short and strongly transverse, more than twice as wide as long, the 

 sides converging, broadly arcuate and subcontinuous with those of the elytra, the 

 disk wholly devoid of basal fovete or impression ; elytra oblong-oval, rather con- 

 vex, slightly longer than wide, broadly and obtusely rounded conjointly at tip, 

 much wider than the prothorax and more than three times as long, the sides 

 broadly arcuate ; punctures very fine, sparse and subasperate ; under surface 

 shining, sparsely clothed with coarse inclined hairs. Length 0.78 mm.; width 

 0.45 mm. Texas minutus, sp. nov. 



'//<., 





