1 62 Memoirs on the Coleoptera 



inflated posteriorly, a third longer than wide, nearly two-thirds wider 

 than the prothorax, the humeri strongly rounded; surface with confused 

 flattened tessellate sculpture, the tegulae frequently forming transverse 

 rugulation, closely subgraniform toward sides and apex; legs moderate; 

 hind tarsi four-fifths as long as the tibiae. Length (9) 22.0 mm.; 

 width 1 0.0 mm. Utah (Stockton), — Spalding. 



The conspicuous metallic fovese of the elytra are about ten to 

 fourteen in number in the series, more widely separated suturally 

 than externally; the metallic foveas of the submarginal line are 

 small and close-set. This species is allied to the preceding. 



The species from Vancouver Island named irregularis by Walker, 

 is said to be aeneous-black, 12 lines (24 mm.) in length, the head 

 rugulose in front and the elytra each with three discal series of golden 

 points. If the length is accurately stated it is even much larger 

 than tepida and is probably a valid species, though nothing more 

 definite can be said of it at present. Probably cogitans is its 

 nearest relative from the Rocky Mountain region, though distinct 

 without much doubt. 



The form which I announced some years ago under the name 

 Calosoma davidsoni as a subspecies or variety of semilcBvis, I now 

 believe to be entitled to a fully specific status; the prothorax is of 

 a distinctly different habitus, being relatively smaller, much nar- 

 rower, more parallel and less arcuate laterally in both sexes; the 

 following, however, is probably a subspecies of semilcBvis: 



Calosoma semilaevis ssp. adjutor nov. — Body in general form and 

 habitus almost exactly as in semilcevis, but differing in the sculpture of 

 the pronotum, which in the latter is finely, densely punctate throughout, 

 more coarsely base and apex medially, the punctures coarser, dense and 

 rugose toward the sides; here however the punctures centrally are very 

 fine and sparse, becoming coarse but well separated and not at all rugose 

 basally and apically toward the middle, but almost similarly coarse, 

 dense and rugose toward the sides; it differs also in the maxillary palpi, 

 the fourth joint of which in semilcevis (cf ) is nearly three-fourths longer 

 than wide, while here it is stouter and very much shorter, being less 

 than one-half longer than wide. Length (cf) 23.0 mm.; width 10. o 

 mm. California (Alameda). 



The surface of the head is much less densely punctate in adjutor, 

 which at present is represented by only one specimen. 



There is a group of species allied to prominens Lee, but smaller 

 in size and especially very much narrower, with relatively smaller 

 prothorax. The first of this group to be made known was parvi- 



