7o MEMOIRS ON THE COLEOPTERA 



Group I. 

 Subgenus Pelidnota in sp. 



This subgenus, that is, the typical Pelidnota may be rather 

 more abundantly developed in the colder than in the warmer regions 

 of the continent. The body is oblong-oval, always rather strongly 

 convex and diversely colored; those with yellow-brown, non- 

 metallic coloration, having three black points on each elytron, are 

 numerous in the nearctic regions but are wanting on the Pacific 

 coast; they are closely allied and difficult to treat taxonomically, 

 and have never been studied systematically thus far; the following 

 arrangement of the forms in my collection is therefore merely pro- 

 visional or tentative. 



Body pale in color above 2 



Body castaneous above, the head and prothorax black, with metallic- 

 greenish lustre 8 



Body intensely black above and beneath throughout and without metallic 

 lustre 9 



2 Head black, the clypeus and obtuse angular prolongation from the 

 latter on the front pale 3 



Head wholly pale in color, though generally slightly blackish along the 

 upper margin of the eyes. . 4 



3 Ligula narrower; body more cylindric, testaceous, with distinct blue- 

 green metallic gloss, piceous beneath, with stronger greenish-metallic 

 lustre; clypeus (cf ) triangular, with the apex slightly reflexed and 

 truncate, barely a third as wide as the base, which is three-fourths 

 wider than the length, the angles rounded, the surface coarsely, very 

 densely punctate; remainder of the head also coarsely but loosely 

 punctate to the base; prothorax convex, twice as wide as long, ob- 

 tusely angulate at the sides just behind the middle, the sides parallel 

 and straight thence to the obtuse and rather rounded basal angles and 

 converging and straight to the prominent and acute apical angles, 

 the peripheral bead very coarse and strong, entire except for a short 

 distance at the middle of the apex; punctures rather small but deep, 

 sparse, coarser and more close-set laterad; elytra not evidently wider 

 than the prothorax, cylindric, obtusely rounded at apex, rather more 

 than a fourth longer than wide, having broadly but very feebly im- 

 pressed lines, each lineate with very small and widely spaced punc- 

 tures, the general surface with very fine sparse punctures, the inter- 

 spaces not sculptured; pygidium with rather coarse, mingled with 

 finer, sculpture, basally, smooth and with very sparse fine punctures 

 thence to the tip; femora and tibiae testaceous, each with a broad 

 black metallic stripe along the middle of the lower face from base to 

 apex, the tarsi pale, with the apices of the joints dark; mesosternal 

 process unusually acuminate anteriorly. Male with the sixth ventral 

 feebly sinuate at the middle of the apex, the pale additional segment, 



