18 Trans. Acad. Scr. of St. Louis. 
the extreme sides of the front under a more or less prominent 
supra-antennal ridge or'tumidity. The Aleocharini, Stenini, 
Euaesthetini and some Xantholinini have the fourth palpal 
joint small and aciculate, but the antennae are placed more upon 
the upper surface of the front, in smaller and more exposed 
foveae and are less widely separated at base, being notably ap- 
proximate in the Xantholinini. The Pinophilini, having the 
antennae inserted as in Paederini, have the fourth joint of the 
maxillary palpi large and very obliquely securiform; they are 
therefore not closely related to the Paederini and their refer- 
ence to that tribe as a subtribal group in the European cata- 
logue of Heyden, Reitter and Weise is not justified in any way. 
The general form of the body in this tribe is more or less 
parallel and moderately to feebly convex; in size they vary from 
very minute to that of a moderately large Staphylinus. The 
integuments are moderately dense, generally rather sparsely 
sculptured and with inconspicuous vestiture, except in a few 
cases, such as the Lithochares and in Pseudomedon, where the 
sculpture and short vestiture become very dense and the 
surface lustreless. The head is well developed as a rule, 
but the neck varies greatly in width, more so in fact than in 
most of the other Staphylinid tribes and forms a valuable 
taxonomic criterion, as is also the case with the labrum, which is 
greatly diversified in structure as may be inferred fromthe gen- 
eric descriptions of the tables. The fourth joint of the maxil- 
lary palpi, although small in size throughout, varies in struc- 
ture toa remarkable degree as seen in Grastrolobium, Paederus 
and Hchiaster. The ligula may be bilobed, as in the Crypto- 
bia and Lathrobia, fimbriate as in the Lithochares, tridentate 
as in the Scopaei or unarmed at tip. But comparatively little 
variation has been noted in the mentum or labial palpi. The 
gular sutures are greatly diversified and have been employed 
in the definition of the genera in some of the larger subtribes, 
such as the Lathrobia and Medones, though within the limits of 
some others, as in the greater part of the Cryptobia, the Sunii, 
Stilici and Echiasteres, they are so fixed and uniform as to be 
of no use in generic classification. ‘These sutures may be 
either united, forming a single suture, or extremely widely 
