Casey ■ — Observations on the Staphylinidae. 225 



rather small, the occiput impressed, the antennae moderate in length, 

 thick; prothorax without ante-basal impression; scutellura flat, not 

 modified; hind tarsi much shorter than the tibiae, the basal joint longer 

 than the next three combined. Europe and America— by recent intro- 

 duction Caidiola 



Middle acetabula equally well separated, but, posteriorly, merging by a 

 long gentle slope into the metasternal surface, its limits there not at all 

 well defined by a subobsolete beaded edge, the mesosternum not at all 

 broadly elevated but with a narrow and strongly elevated carina, 

 extending throughout the length to the truncate tip of the process, which 

 extends nearly to the middle of the acetabula and there meets on the 

 same level the truncate tip of the equally elongate metasternal projec- 

 tion ; prosternum before the coxae moderate, its external posterior line 

 very obtusely subangulate, the internal acutely cusped; head, eyes and 

 antennae nearly as in Cardiola, the prothorax also of similar form, not 

 transversely impressed before the base; scutellum elongate, coarsely, 

 densely sculptured, transversely convex; hind tarsi much shorter than 

 the tibiae, the basal joint not quite as long as the next three combined. 

 Europe *Lophagria 



3 — Mesosternum on a superior plane, throughout its width, to the metaster - 



num and connecting isthmus, its posterior line broadly cusped at the mid- 

 dle ; prosternum wholly corneous under the coxae. Middle coxae widely 

 separated, the mesosternum broad and wholly unmodified, the process 

 projecting from the foot of the clifE forming its hind margin, more or less 

 abbreviated and broad, entering between the coxae for a variable but 

 generally short distance, its surface transversely elevated in the middle, 

 its apex angularly protruding into the emarginate apex of the long 

 broad metasternal projection, which is transversely convex; there is 

 apparently a closely amalgamated connecting isthmus of varying form; 

 prosternum before the coxae moderately long, its exposed part flat, 

 with its hind margin strongly and acutely cusped in the middle; head 

 arcuato-truncate, the neck very slender, the eyes moderate, the an- 

 tennae very stout, with the last joint unusually short, much shorter 

 than the two preceding combined; prothorax not transversely impressed 

 before the base, the hypomera not delimited from the pronotum by an 

 entire beaded edge, broadly constricted behind the coxae; scutellum 

 granularly sculptured, sometimes channeled along the middle ; legs long 

 but unusually stout, the basal joint of the hind tarsi much shorter than 

 the next three combined and decidedly thicker, the latter equal among 



themselves. Nearctic North America Chitalia 



Mesosternum not on a superior plane to the metastemum and wholly un- 

 modified on its surface 4 



4 — Corneous plates under the anterior coxae uniting on the median line. 5 

 Corneous plates very small and rudimentary, covering only a small part of 



the exposed membrane around the spiracles 11 



5 _ Hypomera sharply delimited from the pronotum by an entire beaded 



edge 6 



Hypomera not delimited by an entire beaded edge, though definable, as in 

 Ghitalia, by differences of sculpture 10 



6 — Hypomera but slightly dilated at the middle, long and narrow in outline. 



