STAPHYLINID.E. 71 



they differ from both of these genera, not only in the disposition 

 of the pubescent tufts at the sides of the abdomen, but in their 

 slender antennse. The species are closely allied among themselves, 

 adhering, as in Atemeles, very closely to the type generic structure 

 throughout, but the following seem to be a few forms worthy of 

 separation from cava and montana: 



Xenodusa lobata n. sp. Stout, parallel, pale red-brown in color and 

 alutaceous, the abdomen polished; head comparatively small, nearly 

 as long as wide, but little over two-fifths as wide as the prothorax, the 

 eyes unusually large, convex, at only very little more than their own 

 length from the base, the sides behind them straight and distinctly 

 converging to the base; frontal impression and the antennse nearly as in 

 cava, the latter slightly longer and more slender; prothorax as in cava, 

 except that the sides before the middle are more rounded and less an- 

 gulate and thence to the base not sinuate, as in that species, but sub- 

 arcuate, the basal lobe strongly rounded, separated from each basal 

 angle by a deep and pronounced sinus; elytra and abdomen nearly as 

 in cava, except that the two basal tergites are not so evidently punctulate. 

 Length 5.7 mm.; width 2.0 mm. Iowa. 



Differs from cava Lee., in its larger size, paler coloration, smaller 

 head, with much larger and proportionally less prominent eyes and 

 in the form of the sides of the prothorax. In cava the color is dark 

 red-brown as a rule, the eyes from above smaller, very prominent 

 and at fully three-fourths more than their own length from the 

 base, the sides behind them nearly straight and strongly converging; 

 my two examples of cava are from Michigan. 



Rey makes barely any allusion to sexual differences in the closely 

 allied genus Atemeles and they appear to be very slight here ; at any 

 rate, one of my two examples of cava has the sixth ventral broadly, 

 and the other more narrowly and parabolically, rounded, and they 

 may therefore represent the male and female, but there are no other 

 striking differences to be observed. 



Xenodusa probata n. sp. Large, stout and nearly similar to the pre- 

 ceding in general form, sculpture and coloration, though not so pale 

 and more nearly like cava in that respect; head larger, distinctly wider 

 than long, more than two-fifths as wide as the prothorax, the eyes rather 

 larger but less prominent than in cava and smaller, though otherwise 

 similar, than those of lobata, at one-half more than their own length from 

 the base, the sides behind them nearly straight but only just visibly 

 converging, the frontal impression and antennse nearly as in the pre- 

 ceding; prothorax as in lobata in general form but rather less transverse 

 and with the sides before the middle more prominently rounded, though 



