94 MEMOIRS ON THE COLEOPTERA 



two-thirds longer than wide, parallel, only very little wider than the 

 prothorax, rounding behind in about apical third, the sinus feeble 

 and rather short though distinct; striae fine but impressed, the scutel- 

 lar unusually short, free, the intervals broadly convex, the puncture 

 a little before apical fifth, the very fine punctulation of the striae 

 accompanied by disproportionately large but feeble crenulation of 

 the intervals; basal joint of the hind tarsi barely visibly longer than 

 the fifth. Length (c?) 10.5 mm.; width 3.8 mm. California (the 

 locality not recorded). A single example crenatellus n. sp. 



Elytral striae smooth, impunctate and without trace of adjacent crenu- 

 lation 10 



10 Prothorax only very moderately transverse as in the preceding.. . n 



Prothorax decidedly shorter and more transverse, about one-half wider 

 than long 12 



II Form (cf ) unusually narrow and elongate, colored throughout as in 

 the preceding and very shining; head less than three-fifths as wide 

 as the prothorax, as in the preceding, except that the antennae are 

 slightly infuscate throughout, with the two basal joints paler; pro- 

 thorax only about a third wider than long, similar throughout, except 

 that the base is transverse, the margin rather widely interrupted 

 medially and that there is a slight flattening of the latero-basal convex 

 smooth surface in the vicinity of the rounded angles, the punctures 

 of the foveae, also, are sparser and less rugose; elytra not evidently 

 wider than the prothorax, about two-thirds longer than wide, more 

 gradually narrowing and rounded behind from a little behind the 

 middle, the sinus short and feeble ; striae rather fine, slightly impressed, 

 the scutellar very moderate, the intervals feebly convex, polished, the 

 puncture near apical fifth ; basal joint of the hind tarsi equal in length 

 to the fifth. Length (cf) 9.0-9.8 mm. ; width 3.3-3.4 mm. Oregon 

 (locality unrecorded). A female with the same locality label is 

 stout, relatively very much stouter than the female of cautus, 

 rather dull throughout, the elytra densely opaculate, with thesutural 

 angles obtusely prominent and the legs partially piceo-rufous. It 

 may represent another species; it is 9.6 X 3-8 mm. in dimensions. 



oregonensis n. sp. 



Form (cf Distinctly shorter and stouter, similar throughout in its deep 

 black color, the antennae however more as in crenatellus; surface less 

 polished than in the preceding, the elytra even of the male being 

 very feebly alutaceous and with the striae finer, unimpressed as a 

 rule and with almost perfectly flat intervals; head similar but a trifle 

 larger; prothorax as in oregonensis throughout but more transverse, 

 with the basal bead uninterrupted and with less obvious flattening 

 near the hind angles but resembling it, and differing from crenatellus, 

 in having the fine lateral re flexed margin very faintly enlarging 

 before becoming obsolete at basal fourth; in the latter there is no 

 trace of this; elytra much shorter, only one-half longer than wide 

 and more abruptly rounding and obtuse behind in about apical 

 third, the sinus much more transverse and not so strongly oblique 

 as in the preceding, similarly feeble though evident; scutellar stria 

 much finer and more superficial, like the other striae, the dorsal 



