Casey — Observations on the iStaphylinidae. 187 



slender, the hind tarsi nnusually short, with the basal joint much 

 shorter than the next two combined. Sonoran fauna of America. 



Ealinsa 



8— Body nearly as in Neolara though less stout, minute in size; meso- 

 sternal process extremely short, extending but little beyond anterior 

 fourth of the acetabula, its tip truncate and separated from the long, 

 convex, laterally ill-deflned metasternal projection by a short flat 

 isthmus, which extends obliquely in plane from the depressed apex 

 of the metasternum to the tip of the mesosttrnum; presternum well 

 developed before the coxae, extending about three-fourths the way 

 to the mesosternum, its tip obtuse and subparabolic ; head well 

 developed, arcuato-truncate at base, the palpi slender; antennae 

 rather long, incrassate toward tip; eyes somewhat small but prom- 

 inent; neck less than a^third as wide as the head; prothorax wider 

 than long, obtrapezoidal, strongly and almost evenly convex, not 

 impressed in the middle before the base; elytra not angulate ex- 

 ternally at tip; abdomen rather broad, parallel, the first three ter- 

 gites rather narrowly and not strongly impressed at base; legs 

 slender, the hind tarsi very slender, filiform, with the basal joint 

 much elongated and about equal to the next two combined. America 

 and Mexico. \^=Merona \\ Shp.] Meronera 



Body somewhat as in Tachyusa but stouter; middle coxae still more 

 widely separated than in Meronera, the mesosternal process very broadly 

 arcuato-truncate at tip, extending to about anterior two-fifths of the 

 acetabula, separated from the broad, anteriorly and gradually de- 

 pressed, parallel, transversely convex and laterally ill-defined me- 

 tasternal projection by a short and very wide isthmus inclining up- 

 ward from the tip of the latter to the mesosternum, the entire 

 structure somewhat as in Meronera\ prosternum moderate before 

 the coxae, broadly rounded posteriorly; head well developed, 

 rounded behind, the palpi long and herissate, the eyes large and 

 prominent; antennae moderately long, slender, slightly incrassate 

 distally; neck distinctly less than half as wide as the head; pro- 

 thorax not transverse, obtrapezoidal, convex, broadly, obsoletely 

 impressed along the middle; elytra well developed, angulate exter- 

 nally at tip; abdomen much narrower than the elytra, subclaviform, the 

 three basal tergites strongly and broadly impressed and coarsely 

 sculptured at base as in Tachyusa, except that the impressions have 

 no trace of medial carina; legs long, the hind tarsi very long, sub- 

 equal in length to the tibiae, with the basal joint rather longer than 

 the next two combined. South Africa "'Amanota 



The apparent mutual affinities of the various genera are 

 not very well brought out in the above table, and it is 

 rather difficult to indicate this in the linear succession ne- 

 cessitated by a tabular arrangement. Their mutual rela- 

 tionships may be more readily appreciated by the following 

 diagram, where the various groups are connected by lines 



