REVISION OF TENEBRIONID SUBFAMILY CONIONTIN^ 97 



collis, form a tolerably distinct section by themselves and have 

 occasionally some unusual modifications of the marginal line of 

 the prothorax. The others, forming the larger part of the group, 

 have a superficial interresemblance which is very confusing, 

 necessitating prolonged and careful study before even attempt- 

 ing to identify them by published characters. In a number of 

 forms it is difficult to say whether the prosternal lobe is mar- 

 gined or not, there being some variability in the character, and, 

 when the margin becomes feeble, as in ofacicollis and longi- 

 collis, the surface must be held so as to reflect the light at grad- 

 ually varying angles in order to recognize the marginal con- 

 vexity ; in others, however, the margin takes the form of a 

 strong convex bead, defined by an unequivocal groove, but the 

 character is not altogether satisfactory. 



The forms at present in m}' cabinet may be known as fol- 

 lows : — 



Larger species, never under lo.o mm. in length 2 



Small species, never exceeding lo.o mm. in length 15 



2 — Prosternal lobe margined throughout its contour 3 



Prosternal lobe margined at the sides but not at apex 12 



3 — Prothorax broadly rounded at the sides, sensibly wider behind the 



middle than at base. Form parallel, convex, deep black, polished 

 throughout, glabrous ; head rather strongly but sparsely punctured, 

 not impressed at the lobes, the anterior canthus slightly less 

 prominent than the posterior ; prothorax one-half wider than long, 

 the sides gradually more rounded and converging apically, the 

 apex barely three-fifths as wide as the base, the sinus circularly 

 rounded but not deep, the angles obtusely rounded ; surface very 

 finely and remotely punctate, less finely but still sparsely so later- 

 ally, the marginal bead rather fine, not at all incurvate at base; 

 scutellum large, broadly triangular; elytra parallel, as wide as the 

 prothorax, rather more than one-half longer than wide, very 

 obtusely rounded at tip, the surface nearly smooth, somewhat 

 finely though strongly, very remotely punctate, but little more 

 coarsely or less sparsely so toward the sides, the margins very 

 finely reflexed ; prosternum finely, sparsely punctate, the process 

 strongly grooved and beaded about its entire contour; hind femora 

 rather finely but deeply, sparsely punctate, the abdomen minutely, 

 very remotely. Length 13.5 mm. ; width 5.9 mm. California. 



rotundicollis n. sp. 



Protjiorax not conspicuously rounded at the sides, though a little 

 narrower at base than at a short distance before the latter. Form 

 narrower and slightly less convex, parallel, deep black, not so 



