144 MEMOIRS ON THE COLEOPTEKA 



Form narrower, deep black throughout; head much less deeply impressed 

 but with coarser, deep and close-set punctures throughout; antenna 3 

 distinctly shorter (cf ); prothorax much shorter, fully three-fourths 

 wider than long, five-sixths as wide as the elytra, otherwise similar, 

 except that the apex is but little narrower than the base, the surface 

 opaque, with the sparse punctures notably less fine, becoming in 

 fact quite large on the lateral slopes, with the minute punctules less 

 distinct and more remote and without impressions, except the 

 similar very small feeble one on the median line basally; elytra three- 

 fourths longer than wide, similar, except that the strongly convex 

 surface is very highly polished, the sutural region undepressed and 

 the side margin defined by a broad shallow groove adjoining it 

 above as far as apical fifth, but becoming acute and narrowly rerlexed 

 only in about basal three-fifths; punctures similarly extremely minute 

 and sparse; legs slender, slightly shorter; abdomen much more 

 evidently and closely punctulate throughout, the punctures as usual 

 becoming strong posteriorly. Length (cf ) 18.3 mm.; width 9.2 mm. 

 New Mexico (Magdalena), F. H. Snow severus n. sp. 



Severn s differs from corrugans in having the head much more 

 coarsely, closely and uniformly punctate, in the shorter, more opaque 

 prothorax, more denned posterior side margins and much more 

 highly polished surface of the elytra and in the narrower form of 

 the body. These species both differ from blapsoides, more especially, 

 in the strongly punctured head, deeply grooved and strongly reflexed 

 side margins of the prothorax, in having concave longitudinal lines 

 separated by corresponding convex ridges on the elytra, as well as 

 by the more pronounced side margins of the latter. There are a 

 considerable number of Mexican species besides blapsoides, and 

 they occur as far to the southward as southern Mexico; two of them 

 were indicated but not described by Mr. Champion in one of the 

 appendices of the "Biologia." 



Group III- Type costipennis Lee. 



A limited number of comparatively small and slender species, 

 with rather thicker and denser integuments than the preceding, 

 strongly costate elytra, as a rule, and inhabiting a distinctly dif- 

 ferent zoological region, confined to southern California and the 

 adjacent parts of Arizona, alone constitute this very distinct group, 

 which however, in its degradational forms, may readily be conceived . 

 to lead onward to the obovatus series through the angulatus group. 



Elytra with broad and feeble convex ridges separated by very feeble 

 undefined depressions, the suture not elevated. Body moderately 



