376 MEMOIRS ON THE COLEOPTERA 



as in the male and not continued posteriorly along the median line, 

 the transverse prominence at its anterior margin not quite so pro- 

 nounced, the punctuation almost similar but a little coarser, the 

 hairs less developed; elytra a fifth to sixth longer than wide, more 

 rounded at the sides, almost similarly sculptured but fully one-half 

 wider than the prothorax; pygidium more triangular, much less 

 convex, strongly, densely punctato-rugose and becoming gradually 

 finely and irregularly umbilicato-lineate laterally and basally; hind 

 tarsi scarcely two-thirds as long as the tibiae, the anterior tibial teeth 

 as in the male but somewhat stronger. Length 24.8-28.8 mm.; 

 width 12.3-15.8 mm. Twelve examples. 



New York and Virginia to Michigan, Wisconsin and Missouri. 



[ Cetonia eremicola Knoch] eremicola Knoch 



A Female nearly as in the same sex of eremicola but less oval and 

 more oblong, stout, feebly convex, deep black and shining, the 

 elytra faintly picescent; head nearly similar but broader, the 

 densely confluent sculpture rather less coarse; prothorax much 

 larger and with the sides parallel from the obtuse and rounded 

 basal angles to rather beyond the middle, there broadly rounding 

 and oblique to the apex, fully a third wider than long, the punc- 

 tures on the whole closer but entirely wanting in a large discal 

 area at each side just behind the transverse fossa, which is shal- 

 lower and more indefinite than in eremicola, the transverse 

 carina however equally strong; elytra similar but with the parallel 

 sides less arcuate, only about two-fifths wider than the prothorax, 

 the sculpture nearly similar but with the surface more depressed, 

 the posterior slope on the line extending obliquely from each 

 subapical umbo to the suture very abrupt and sharply marked, in 

 a way never observable in eremicola; scutellum broader, almost as 

 wide as long; pygidium broader, more uniformly and strongly 

 rugulose but in a nearly similar manner; hind- tarsi stout and 

 evidently shorter. Length 28.5 mm.; width 15.5 mm. Missouri 

 (St. Louis). A single example subplanata n. subsp. 



The two primary subdivisions of this genus, as defined above, 

 are almost of subgeneric value, the structure of the pronotum being 

 radically different, though that of the remainder of the body, as well 

 as the nature of the sexual modifications, is nearly identical. The 

 European eremita Linn., belongs to the scabra section and was 

 redescribed by G. H. Horn, from some accidentally imported 

 European specimens, under the name socialis (Trans. Am. Ent. 

 Soc., 1871, p. 338); as the species has not been rediscovered here, 

 it is scarcely worth while to refer to it in any further detail than to 

 say that it is much larger than any of our species of the scabra 

 section, being even larger than eremicola, and the sculpture of the 

 elytra is less coarse and not so rough. No species of the eremicola 



