2i6 MEMOIRS ON THE COLEOPTERA 



Nat. Hist., 1901, p. 373; 6-6.5 mm.; Iowa), but differs in having no 

 evident cephalic impressions and only very short apical fifth and 

 sutural elytral striae; in felipce the head is said to have two shallow 

 foveae placed transversely, the fifth stria half the length of the elytra 

 and sometimes traceable to the base and the sutural extending 

 before the middle. There is some confusion of language, I fear, 

 relating to the humeral strise; that which is subentire abruptly 

 ending at some distance from the base in rectus, is the subhumeral 

 of Horn; perhaps this is the inner humeral of Lewis; there is a dis- 

 tinct stria far down on the inflexed and punctured flanks of rectus 

 and perhaps this may be the outer humeral of Lewis. The true 

 inner and outer numerals humeral and subhumeral of Horn are 

 best seen in abbreviatus; can it be that two striae in these positions 

 are both entire mfelipce? That at least seems to be implied by the 

 language used. 



The following species is founded upon the individual taken in 

 Kansas, which was associated by me with the Oregonian pluto 

 in my former work on the genus: 



Hister oblitus n. sp. Slightly narrower and more elongate than pluto, 

 deep black and shining throughout, elongate, oblong-oval; head nearly 

 smooth, the stria deeply sinuate at the middle of the front but not broken 

 as it is in pluto; prothorax of usual outline, only moderately transverse, 

 with converging arcuate sides, the surface not plentifully punctate later- 

 ally as in pluto but nearly smooth, the coarse lateral striae not quite 

 attaining the base, the basal angles similarly broadly rounded; elytra as in 

 pluto but relatively somewhat more abbreviated, the minute sparse 

 punctulation almost as distinct, but the fourth stria much more nearly 

 attains the base; in that species it only extends from near the apex to 

 slightly before the middle; propygidium almost similarly but rather more 

 closely punctate, the pygidium distinctly more closely and somewhat 

 more finely; prosternal lobe similarly narrowly rounded at tip, but with 

 the marginal beading entire; in pluto it is broadly interrupted; mesosternal 

 sinus very abruptly limited and deep; anterior tibiae with four large teeth. 

 Length 8.5 mm.; width 5.2 mm. Kansas. 



This species can be distinguished from pluto by its more elongate 

 outline, longer fourth elytral stria, unmargined apex of the prosternal 

 lobe and by having only four anterior tibial teeth. 



Group Fcedatus. 



This is a rather large group, though when first proposed by Dr. 

 Horn it was supposed to include but four species, of which margin- 



