CERAMBYCID.E 267 



ing and nearly straight to just behind the apex, where they round rapidly 

 to the latter, which is very nearly as wide as the base; surface with a very 

 large deep concavity occupying almost its entire extent, the bottom of 

 the concavity more deeply impressed medially and laterally and also 

 transversely more impressed near its anterior border, not inclosing im- 

 punctate spots, the convex surface laterally with a few very small acute 

 granules on the flanks behind the middle; elytra parallel, nearly two- 

 fifths wider than the prothorax; legs unusually short, slender, the hind 

 tarsi with the second joint more than twice as long as wide. Length 

 (cf) 17.0 mm.; width 4.8 mm. Colorado, Kemp. 



Not closely allied to any other species. The exact locality is 

 unfortunately not recorded by Prof. James F. Kemp, who very 

 kindly sent it to me. 



The two following species are also allied to the preceding in tarsal 

 structure but belong more especially to the agrestis type : 



Criocephalus lacustrinus n. sp. Rather stout, dull, piceous-black, 

 very finely and densely punctured throughout; head obtusely, strongly 

 canaliculate but not at all behind the eyes, the occiput tumid dorsally; 

 antennae ( 9 ) scarcely extending to basal fourth of the elytra, slender 

 and filiform, black, nearly as in agrestis; prothorax scarcely more than 

 two-fifths wider than long, slightly widest and laterally rounded sub- 

 prominently a little behind the middle, the sides thence broadly rounded 

 and moderately converging to the apex, more rapidly and sinuously con- 

 verging to the base, which is but little narrower than the apex, the latter 

 transverse; surface nearly as in agrestis but with the three pits much 

 shallower and the lateral asperities less developed; elytra two and one- 

 half times as long as wide, tapering feebly from base to the rather nar- 

 rowly rounded apex and with very slightly arcuate sides, a fifth wider 

 than the prothorax, the surface very minutely, evenly and densely 

 punctate, without admixed larger punctures except basally and with the 

 raised threads subobsolete, joining each other at apical third. Length 

 (9) 24.6 mm.; width 7.2 mm. Wisconsin (Bayfield), Wickham. 



Differs from agrestis in its finer, denser, more even elytral sculp- 

 ture and very feeble threads, these being unusually strong in that 

 species as in asperatus. It also differs markedly in its less trans- 

 verse prothorax, with feebler impressions and less angulate sides. 



Criocephalus cervinus n. sp. Form more slender, less densely dull in 

 lustre, of a pale red-brown throughout, the legs and antennae concolorous; 

 head nearly as in lacustrinus; antennae (cf ) slender, subfiliform, extending 

 nearly to apical fourth of the elytra, in structure nearly as in agrestis; 

 prothorax moderate in size, nearly one-half wider than long, the sides 

 rounded and scarcely at all prominent well behind the middle, broadly 

 rounded and subparallel for some distance thence anteriorly, rounded at 

 apex, very rapidly and sinuously converging basally, the base distinctly 

 narrower than the apex; surface very densely punctate, with pits as in 



