2O MEMOIRS ON THE COLEOPTERA 



kirbyi, pettiti, centralis and egenus; those represented in my collection 

 may be defined as follows: 



Form almost evenly oval, sometimes even somewhat pointed behind .... 2 



Form very evidently posteriorly inflated, widest near posterior third, the 

 apex very obtusely rounded 19 



2 Elytra with black or blackish vestiture, crossed medially by an almost 

 even solid chevron of pale fulvous or as described by Horn in the 

 Canadian type silvery white decumbent hairs. Body about two- 

 thirds longer than wide, convex; integuments black, the legs feebly 

 picescent, the tarsi moderately pale; head notably small, closely 

 punctured, the hairs short, moderately numerous; prothorax rather 

 less than one-half as long as its basal width, much more than twice 

 as wide as the head, the sides unusually strongly convergent from 

 base to apex, somewhat sinuate behind the middle, the basal angles 

 very acute; surface finely, densely punctate, the sculpture obscured 

 by the short coarse dense vestiture, which is black, largely varie- 

 gated with fulvous; scutellum and elytra with the black pubescence 

 irregularly rather denser on the alternate intervals and mingled 

 toward the sides and apex with very short silvery or cinereous hairs; 

 entire under surface densely, asperately and not very coarsely 

 punctate and with very short, not dense cinereous hairs, the legs 

 similarly sculptured and pubescent, the tarsi smooth and shining, 

 with numerous oblique and rather fine pale hairs beneath. Length 

 8.2 mm.: width 4.8 mm. Indiana. [B. pettiti Horn, Tr. Am. Ent. 

 Soc., 1870, p. 76] pettiti Horn 



Elytra crossed near the middle by two fine transverse and very irregular 

 bands of silvery pubescence, obtusely connected laterally and chiefly 

 traceable by spots on the alternate intervals, the anterior band almost 

 always anteriorly angulate suturally, the posterior irregularly pos- 

 teriorly arcuate in its general course 3 



Elytra with the transverse bands very indistinct, wanting or incomplete, 

 but with a common transverse solid sutural spot, near the middle, 

 of whitish pubescence; body rather small in size and more narrowly 

 oval, the general pubescence rather conspicuously variegated 12 



Elytra without transverse bands or spots, only longitudinally variegated 

 by condensations on the alternate intervals, sometimes apparently 

 not variegated at all 14 



3- Larger species, 7 mm. or more in length, apparently a little smaller 

 in cyclophorus : 4 



Smaller species, 6 mm. or less in length 10 



4 Two transverse elytral pale bands inclosing a subcircular area, 

 which is anteriorly emarginate. Body briefly oval, blackish-piceous, 

 very finely coriaceous, cinereously pubescent; antennae rufescent, 

 the first and last joints infuscate; elytra with two vittae of black, 

 which are somewhat interrupted, the common subcircular macula- 

 tion of the elytra of fusco-aeneous squamules. Described thus by 

 Mannerheim from Alaska (Kenai) examples. Length 6.5 mm.; 

 width 4.0 mm. [B. cycloplwrus Kirby, Richardson Faun. Bor. 

 Am., IV, p. 117] cyclophorus Kirby 



