REVISION OF TENKBRIONID SUBFAMILY CONIONTIN^E 65 



and not lightly passed over as advocated by Horn, the latter 

 author even going so far as to advance such a trivial character 

 as the margination of the prosternal lobe over epipleural struc- 

 ture in inserting l&vis between the mutually congeneric species 

 politus and dubius in his latest table (1. c., p. 423). The species 

 of Eusattus are widely distributed from western Kansas and 

 Oregon to Lower California and are smaller in size than in any of 

 the preceding genera ; those known to me either actually or by 

 description may be recognized by the following characters : 



Elytra absolutely impunctate as in Eusattodes Icevis. Form oblong- 

 oval, nearly as in dubius, black, moderately shining ; head opaque, 

 sparsely punctate, the clypeus nearly entire ; prothorax rather more 

 than twice as wide as long, widest at base, the side arcuate, the 

 margin not fimbriare and the hind angles acutely prolonged pos- 

 teriorly ; surface convex, completely impunctate; elytra smooth, 

 impunctate, the epipleuras gradually and but little wider at base, 

 absolutely smooth ; prosternum coarsely punctured between the 

 coxae, the tip of the process rounded and with a distinct marginal 

 bead ; abdomen very sparsely and finely punctate, shining. 

 Length 9.0-10.0 mm. Lower California (El Taste and San Jose 

 del Cabo) secutus Horn 



Elytra with sparse but evident, more or less muricate punctures 2 



Elytra with larger, subconfluent to small and irregular but isolated, 

 punctiform erosions, without evident muricate punctures, and 

 having uneven, usually elevated impunctate lines; prosternal 

 process never margined apically 14 



2 Form oblong-elongate, the elytra smooth or nearly so, with the 

 punctures small or moderately small in size ; prothorax in the 

 male very transverse, wider than the elytra 3 



Form oblong or oblong-oval, much less elongate, the clypeus never 

 so distinctly emarginate at the middle of the rounded sides, at the 

 ends of the oblique sutures, as in the preceding group 9 



3 Body small in size, strongly convex, the elytra very smooth, the 



punctures very small, sparse, evenly but irregularly distributed 

 throughout, generally becoming distinctly muricate only toward 

 the sides; tarsi slender. [= Conipinus Lee.] 4 



Body much larger, relatively less convex, the elytra nearly smooth but 

 sometimes with vestigial longitudinal areas of greater elevation, 

 the punctures less minute and strongly muricate throughout, with 

 longitudinal and very feebly defined lines, corresponding with 

 those of greater convexity, in which they become sparse or want- 

 ing ; tarsi stouter .6 



4 Color black or piceous-black, the prothorax less transverse and with 



less converging sides, generally but little more than twice as wide 



