486 STAPHYLINIDA. 
Antenne stout; third joint elongate, much longer than the second; fourth joint 
slightly, tenth strongly, transverse. Head slender, narrowed in front, strongly rounded | 
at the hind angles, very shining brassy, with rather numerous coarse punctures, which are 
absent from an irregular rather small space on the disc. Thorax elongate and rather 
slender, with a curved series of seven or eight punctures on each side in addition to the 
discoidal series, and a few supernumerary punctures at the base on each side. Legs 
clear red. Underside of head black, rather coarsely and closely punctate. 
One example. The species has a good deal of resemblance in form to Allotrichus 
arenarius, but the palpi are quite different, the terminal joint being conical and rather 
short. 
ALLOTRICHUS. 
Corpus elongatum, angustum, minus depressum. Labrum bilobum.  Palpi graciles, elongati, articulo ultimo 
elongato, latere interiore subcurvato ; maxillares apice acuminato, labiales minute truncato. Prothorax 
angulis anterioribus nullis, linea marginali superiore versus angulos anteriores minus fortiter deflexa, 
pleura haud abbreviata, anterius angustata. Mesosternum breve, margine posteriore leviter curvato. 
Tarsi simplices. 
This genus agrees with Sawrohypnus in the form of the palpi, but in other respects 
is not allied to that genus; it is, indeed, nearer to Xantholinus, from which it differs 
by the longer terminal joint of the palpi, by the larger prosternum, and by the shape 
of the thoracic side-piece, which is not a parallel-sided narrow slip, but is broad, 
especially just behind the insertion of the coxe; then, owing to the superior marginal 
_ line being more deflected at the front angle than it is in Xantholinus, becomes in front 
of the prosternum quite narrow. The longer of the thoracic tactile sete is placed 
very near the front of the thorax, but is not very conspicuous, owing to the rather 
numerous other sete existing along the side of the thorax, but (if I am right in con- 
sidering this seta placed at the rounded anterior angle to be the tactile seta) is really 
remote from the marginal line. Thus I doubt whether the genus will really prove to 
be a close ally of Xantholinus, as on first consideration it appears to be. 
A. arenarius, Mr. Champion informs me, was found on the sandy bank of a stream 
in the forest. 
1. Allotrichus arenarius. (Tab. XII. fig. 24.) 
Angustulus, niger; capite thorace elytrisque violaceis, nitidis; capite fortiter sat crebre punctato ; prothorace 
elongato utrinque plaga longitudinali punctorum rarorum, inter has et latera parce punctato. 
Long. 13 millim. 
Hab. Panama, Pefia Blanca 3000 to 4000 feet (Champion). 
Only two examples were met with. 
Antenne rather large, joints four to ten transverse. Head elongate, of a shining 
violaceous colour, with numerous coarse punctures, which are more distant along the 
middle; beneath rather more closely and finely punctate, shining. Thorax very 
