462 CASEY 



This group, together with the genera placed below in Noso- 

 dermini, was recently revised by the writer in the Canadian 

 Entomologist (1907, p. 29 et seq.), where the above genera 

 were originally defined. 



Zopherus Gray. 

 This genus is widely diffused in Mexico and tropical North 

 and South America, being represented by many species, some 

 of which approach each other rather closely in facies, so that 

 their circumscription is not always easy. The small additional 

 tubercle, between the regular tubercle and the apical angles, 

 varies a good deal in prominence and may possibly be gradually 

 obsolescent in various forms, but, at the same time, it seems to 

 be correlated with the form of the posterior margin of the 

 excavation in the last ventral segment, this marginal wall being 

 anteriorly prominent at the middle in the bituberculate apex and 

 emarginate in the quadrituberculate. We have but a single 

 species, which may be readily known as follows : — 



Body elongate, convex, rather dull In lustre, the upper surface yel- 

 lowish-white, with the median part of the pronotum and sutural 

 parts of the elytra irregularly black, a large black subquadrate 

 blotch in basal half of the former particularly conspicuous; 

 head black, with a transverse pale line at base, very finely and 

 remotely punctate; prothorax about as long as wide, twice as 

 wide as the head, the apex much wider than the base, bisinuate, 

 the sides slightly and subangularly dilated before the middle, 

 thence moderately converging, rather strongly arcuate and tuber- 

 culose to the feeble sinuosity at the base, the surface smooth, 

 finely, sparsely punctate, usually having a few small black spots 

 at the centre of the broad lateral white regions ; scutellum tri- 

 angular, confined to the steeply sloping base of the elytra and 

 scarcely entering between them; elytra elongate-oval, as wide as 

 the prothorax and not quite twice as long, with five rows of large 

 feeble tubercles, the sutural close-set, forming a continuous black 

 line, the second and third rows composed of much more widely 

 separated black tubercles on the white ground, the fourth row 

 still more widely spaced, separated from the adjacent series by a 

 much wider interval, the fifth again with rather close-set tubercles 

 and at the lateral margin ; apical tubercles four in number ; under 

 surface in great part black, the prothorax wholly so, the other 

 sterna with some white spots laterally and the second and third 

 segments each with a white blotch at each side of the middle; 

 prosternum coarsely, coalescently punctate medially, not tuber- 

 culose, the intercoxal surface canaliculate along the middle ; pos- 



