354 CASEY 



thickness from base to apex and unusually strongly spinulato- 

 rugose. The metasternum is slightly shorter than the tirst ven- 

 tral segment, the wings vestigial, the surface glabrous and the 

 basal joint of the hind tarsi evidently longer than the last. 

 Mclanastiis is evidently allied to Mcsabates, of Champion, de- 

 scribed in the " Biologia," but does not possess the trilobed 

 front of that genus. Our rather numerous species, including 

 one from Mexico, may be defined as follows : — 



Eyes more distinct, coarsely faceted as usual, the prothorax finely but 

 evidently margined at the sides 2 



Eyes smaller, somewhat more finely faceted than usual, the pronotum 

 not margined at the sides 21 



2 — Elytral series never impressed, except very finely and obsoletely in 



a few species as mentioned below ; prothorax seldom much nar- 

 rower at apex than at base 3 



Elytral series distinctly and rather broadly impressed ; prothorax sub- 

 evenly and moderately narrowed from base to apex, — a very ex- 

 ceptional form in the present genus 20 



3 — Sides of the prothorax not distinctly sinuate before the obtuse basal 



angles 4 



Sides of the prothorax subparallel and arcuate, distinctly sinuate for a 

 short distance at the l^asal angles, whicli are thereby rendered more 

 or less prominent, subacute and never at all blunt. 14 



4 — Elytra not distinctly wider than the prothorax, the sides of which 



are subparallel 5 



Elytra more or less evidently wider than the prothorax 10 



5 — Elytra shining 6 



Elytra dull, generally opaque 7 



6 — Form oblong-suboval, convex, shining, black, the under surface 



blackish, the legs dark rufous; head as wide as an elytron, rather 

 coarsely but not densely punctate except at apex, where it is sub- 

 rufcscent, the surface verv slightly alutaceous, the apex broadly 

 arcuato-truncate ; prothorax three-fourths wider to nearly twice 

 as wide as long, the sides rather feebly arcuate, generally straighter 

 toward apex and base, the basal anq^les oidy slightly olituse and not 

 at all blunt, the apex slightly narrower than the base, deeply sinu- 

 ate, the punctures rather small but deep and sparse medially, be- 

 coming somewhat rapidlv rather coarse, deep and close-set but 

 scarcely confluent in lateral fourth ; scutellum moderate, transverse, 

 l)roadlv rounded ; elytra less than one-half longer than wide, three 

 times as long as the prothorax or, in the female, a little more, 

 acutely ogival at tip, the sides very feebly inflated and broadly 



