272 MEMOIRS ON THE COLEOPTERA 



arbitrarily expand and contract in the way hitherto supposed. 

 Moreover, in the black bifasciate species, it is difficult to see 

 how the pattern of elytral coloration could have been derived from 

 the normal type, and the discovery of a rather marked antennal 

 structural peculiarity in one of these black forms would seem to 

 indicate that it is not a color variation but a distinct species.* 

 I would therefore separate the material before me into the six 

 following species and subspecies: 



Elytra pale, black in about apical third and each also with a rounded 



spot of the same tint at the centre of the pale area 2 



Elytra wholly black, crossed by two pale transverse fasciae 3 



2 Form narrow, parallel, very obtusely rounded behind and but feebly 

 convex; head rather small; eyes widely separated, small, almost 

 divided; front convex, not canaliculate, rather coarsely, very densely 

 punctured; antennae about as long as the body (cf ) or much shorter 

 (9 ), joints three to five increasing in length (cf ) or with the fourth 

 but little longer than the third and both much shorter than the 

 fifth ( 9 ), outer joints compressed, gradually more slender; prothorax 

 small, wider than long, angularly prominent laterally at the middle, 

 the sides thence feebly converging and evenly arcuate to the apex 

 and similarly converging but broadly sinuate to the base, the surface 

 very coarsely, densely punctate and with five moderately defined 

 callous polished spots; scutellum dark, punctate, obtusely ogival; 

 elytra more than twice as long as wide, coarsely, loosely punctate, 

 more finely and closely in the dark areas; legs moderate. Length 

 (9) lo.omm.; width 3.2mm. Pennsvlvania. [ Callidium ligneum 



Fabr., Mant. Ins., I, p. 153] lignea Fabr. 



A Smaller than the preceding, the black apical area occupying nearly 

 two-fifths of the elytra; head similar; antennae (cf) distinctly 

 incrassate basally, the second joint less than a third as long as 

 the third, transverse, three to five increasing rather rapidly in 

 length, sixth equal to the fifth, six to eight decreasing very slowly, 

 the last slender, simple, only very slightly longer than the tenth; 

 prothorax nearly as in lignea but with the central callous spot 

 more prolonged anteriorly as a rule along the median line; scu- 

 tellum much narrower; elytra shorter, twice as long as wide, 

 similarly much wider than the prothorax and of nearly like 

 sculpture, except that the punctures of the dark areas are still 

 smaller and closer; legs rather short and slender, black. Length 



(cf) 7-7 mm.; width 2.5 mm. Colorado parvicollis n. subsp. 



Form less parallel and more convex, much broader, black throughout, 

 except the elytra, the femora black, tibiae and tarsi dark brown; 

 surface rather more shining than in the preceding; head larger than 

 in the two preceding, not so narrowed behind the eyes and less 

 confluently punctate, the punctures (cf) slightly separated; an- 



* The eastern species live in the wood of cedars, according to Mr. Jiilich, and the 

 western in the wood of the Sequoia (Ent. Amer. I, p. 97.) Ricksecker. 



