Casey — Observations on the StapJiylinidae. 135- 



tinctly sinuate externally at tip ; abdomen of normal width, narrowed- 

 slightly behind the middle, the impressions continuous in punctuation 

 with the rest of the surface; legs short, the hind tarsi much shorter than 

 the tibiae, with the basal joint as long as the next two together or but 

 little longer. Europe and Atlantic America Rheochara. 



Form less stout, convex, the integuments strongly shining, feebly and in- 

 conspicuously punctulate, the abdomen very sparsely punctulate, with 

 the punctures of the impressions barely as large as the others and still- 

 sparser; mesosternal process very slender, much abbreviated as usual 

 but very narrowly rounded or subacute at tip, tbe surface near the 

 apex deeply concave, the tip failing to attain the very feebly rounded 

 metasternum, which exhibits scarcely any tendency to project between 

 the coxae, by an extremely large and deep longitudinal discontinuity ;^. 

 the mesosternum, with a low broad and flat irregular cariniform ele- 

 vation in about anterior half; head relatively larger though moderate^ 

 abruptly constricted at base, the sides subparallel, the eyes moderately 

 prominent, the front broadly arcuate, the antennae much larger and- 

 more developed, with the fourth joint abnormal, slightly elongate and 

 not differing much from the fifth; palpi elongate end slender; pro- 

 thorax only slightly narrowed from base to apex , broadly arcuate at base, 

 the angles obtuse but distinct; elytra long and well developed, each 

 deeply sinuate externally at apex; abdomen unusually narrow, rather 

 strongly narrowed in apical half; legs slender, the hind tarsi shorter 

 than the tibiae but very slender, filiform, with the basal joint as 

 long as the next three combined and longer ttian tbe fifth. Pacific Coast 

 of America Rheobiomft 



16 — Body as In Eheobioma, shiDing, the integuments less sparsely and 

 rather more distinctly sculptured; mesosternum without trace of carina 

 anteriorly, the procf ss very slender, excavated near the narrowly acu- 

 minate tip which just attains a long and very pronounced, narrowly 

 rounded or subangulate projection of the metasternum; head and 

 palpi nearly as in Rheobioma, the antennae almost as well devel- 

 oped but with the fourth joint much smaller than the fifth, though 

 nearly as long as wide; prothorax subparallel, with the base strongly 

 and evenly arcuate, the angles rounded but not obliterated; elytra long 

 and well developed, each broadly and moderately sinuate externally at 

 tip; abdomen normally broad at base but rapidly narrowed behind the 

 second segment, the basal impressions scarcely visibly more coarsely 

 but less closely punctured than the remainder of the first two tergltes j 

 legs rather long and slender, the hind tarsi as in the preceding genus. 

 Pacific Coast of America Rheocliarella 



The genera above described are rather numerous and it 

 may seem more appropriate to consider some of them as sub- 

 genera. In regard to this, however, it should be stated that 

 it seems very difficult to make any such combinations with- 

 out including all of them as subgenera of Aleochara. After 

 careful study it appears to me absurdly inconsistent to main- 



