Casey — Observations on the JStaphylinidae. 277 



very slender and but slightly arcuate. The middle coxae are 

 always widely separated, the sterna between them forming a 

 smooth subcontinuous surface, usually broken only by a more 

 or less fine transverse suture, the mesosternal process never 

 being free, thus contrasting greatly, in the structure of the 

 intermesocoxal parts, with the preceding subtribe Bolitocharae. 

 In the formation of the sternal processes, antennae and in- 

 flexion of the hypomera, the genera Diestola and Encephalus 

 stand at opposite extremes of the series, the former being an 

 annectant type. The genera represented in my cabinet at 

 the present time may be readily identified by the following 

 characters : —7 



Hypomera feebly inflezed, in great part visible from a lateral viewpoint. . 2 

 Hypomera strongly indexed, wholly invisible from a direct side view 8 



2 — Mesosternal process shorter, extending nearly to or somewhat beyond 



the middle of the acetabula, broadly truncate and abutting against the 

 broad metasternal projection which extends for some distance anter- 

 iorly between the coxae 3 



Mesosternal procetis extending throughout the length of the coxae, the 

 metasternum not or only very slightly projecting anteriorly between 

 them and truncate or rounded 7 



3 — Antennae gradually thicker from the base of the third joint to the tip, 



the eleventh joint unusually developed and as long as the preceding 

 three combined; head free, transverse, the eyes well developed, not very 

 prominent, finely faceted and closely setulose; neck narrow, scarcely a 

 third as wide as the head; prothorax obtrapezoidal, having an im- 

 pression before the scutellum ; mesonotum broadly angulate, separated 

 from the elytra throughout the width by a distinct depression; elytra 

 well developed ; abdomen parallel, the first three tergites impressed at 

 base, gradually less deeply; middle coxae moderately widely separated, 

 the mesosternal process not extending quite to the middle of the ace- 

 tabula, feebly carinate along the middle and squarely truncate at apex, 

 where it meets the equally truncate tip of the long metasternal pro- 

 jection; legs rather short, the tarsi stouter than usual. Europe. 



*DIeitota 

 Antennae less developed and with a smaller terminal joint as in Oyrophaena 

 Brachida and Phaenogyra, more or less abruptly enlarged beyond the 

 fourth joint, sometimes gradually thicker from the base of the latter 

 to the tip; neck very wide, the head deeply set in the apex of the pro- 

 thorax; mesonotum separated from the elytra by a feebler depression, 

 generally obsolete along the scutellum; mesosternum without trace of 

 carina, the coxae very widely separated 4 



4 — .Eyes moderate in size, finely faceted ; first abdominal segment narrowly 



and feebly impressed at base, the second less distinctly and the third 

 very obsoletely; mesosternal process extending distinctly beyond the 



