62 Coleopterological Notices, III. 



minutely subrugulose. Scutellum distinct, broadly rounded or subangulate 

 bebind and constricted at the sides near the base. Elytra about three times 

 as long as the prothorax, and, in the middle, about one-third wider than the 

 latter, a little more than twice as long as wide ; sides broadly arcuate ; apex 

 gradually, acutely ogival ; humeri broadly rounded, a little broader than the 

 base of the prothorax ; disk evenly convex, finely but rather strongly, evenly 

 but irregularly, moderately densely punctate. Abdomen finely, sparsely 

 punctate. Legs moderate in length, slender. Length 5.0-6.4 mm. ; width 

 1.7-2.2 mm. 



Arizona; New Mexico. 



Distinguishable from pallidus by its much smaller size and more 

 slender form, more quadrate prothorax, still paler coloration and 

 more shining surface lustre. Apparently not rare. 



IDIOBATES n. gen. 



This name is proposed for Tenebrio castaneus Knoch, an anoma- 

 lous form hitherto associated with the normal members of Tenebrio, 

 but manifestly distinct by reason of its completely divided eyes and 

 abdominal structure, only the penultimate segment of the latter 

 being provided with a visible coriaceous hind margin. I would 

 suggest that it be placed in the Blapstini near Mecysmus. 



The generic value of castaneus was long ago recognized by 

 Bates, and later by LeConte, but I am not aware that it has ever 

 been given a distinctive name. It certainly constitutes as good a 

 connective bond, between the Blapstini by way of Mecysmus and 

 the other Tenebrionini through Tenebrio, as could well be found, 

 the undilated anterior tarsi being a matter of no material import- 

 ance in this connection. 



In the table of the tribe Tenebrionini given on page 393, Vol. V 

 of these Annals, the genus Calcar, together with one or two other 

 exotic genera, must constitute a group distinct from the Tenebriones 

 by reason of the very exceptional abdominal structure, the coria- 

 ceous hind margins of both the third and fourth segments being 

 completely invisible. This well-known fact was inadvertently over- 

 looked in compiling the table alluded to. 



BLAFSTINUS Latr. 



I have recently, by way of experiment, dissected a series of eight 

 specimens of a form very near rufipes, probably a variety or race of 

 that species, and have found a singular and altogether unexpected 



