86 MEMOIRS ON THE COLEOPTERA 



flexed inwardly toward apex, meeting the first costa near the apex 

 and thence extending as a single costa nearly to the conjointly 

 subacute tip; between the first costa and the side margin there is 

 a very irregular second costa having numerous branches and uniting 

 with the first costa behind the middle. The costse are more densely 

 punctured and pubescent than the depressions but the pubescence is 

 of the same character. The legs and tarsi are short and slender, 

 the anterior tibiae cylindrical, generally with a very small acute 

 external angle at tip. The prosternal process is deflexed, sloping 

 gradually to the level of the mesosternum and the trochantin is 

 small but visible. The integuments are usually clean, only oc- 

 casionally being covered with a dense argillaceous coating, this 

 being by no means characteristic as it is in Astrotus. 



The various species and subspecies adhere very consistently to 

 the above formula and are closely allied among themselves; those 

 in my cabinet may be recognized possibly by the following char- 

 acters: 



Sides of the prothorax evidently sinuate before the basal angles, which 

 are right and frequently slightly prominent 2 



Sides of the prothorax oblique posteriorly, not or scarcely sinuate before 

 the basal angles 5 



2 First and second elytral ridges uniting at about apical third 3 



First and second ridges uniting well in advance of apical third or at about 

 apical two-fifths 4 



3 Body moderately stout, blackish-brown in color, the yellowish hairs 

 conspicuous, dense on the ridges; head not evidently impressed, 

 the hairs very coarse and conspicuous; antennae nearly as long as 

 the prothorax, joints three to six gradually and slightly shorter, the 

 tenth abruptly wider, the eleventh small, transversely rounded; 

 prothorax slightly wider than long, the apex moderately sinuate, 

 distinctly narrower than the base, widest slightly behind the middle, 

 the sides broadly rounded, converging and feebly arcuate to the 

 acute but not prominent apical angles, converging, becoming sinuate 

 and then parallel to the right and not rounded but not at all prom- 

 inent basal angles, the base transverse and rectilinear throughout; 

 surface broadly, evenly convex, becoming explanate along the sides, 

 strongly, not densely punctate, with a smooth median line' and a 

 small punctureless spot at each side of the middle; scutellum broadly 

 triangular; elytra widest at the middle, where they are much wider 

 than the prothorax, at base as wide as the base of the latter, three- 

 fifths longer than wide, the first costa frequently divided partially, 

 the space between the second costa and the sides with a short posterior 

 intermediate ridge as usual and with numerous other inequalities; 

 depressions strongly but not coarsely or conspicuously and rather 



