18 PSELAPHIDA. 
an angular depression, the vertex being convex. Thorax narrow, longer than broad ; 
bearing a fine erect pubescence, quite impunctate. Elytra subquadrate, the shoulders 
elevated, and with a short discoidal plica; from behind appearing only quadrifoveate 
at the extreme base; distinctly pubescent, but almost impunctate. Hind body with an 
extremely large basal dorsal plate, the latter very deeply transversely depressed in front. 
Legs stout. 
The two examples obtained are quite similar in structure, and I suspect are of the 
male sex, the metasternum being rather deeply impressed. The latter also exhibits an 
angular prominence on each side close to the outer termination of the coxa, while 
behind the coxa the trochanter is compressed so as to form a somewhat similar promi- 
nence, the articulation being included between the two prominences: in order to see 
these characters properly the insect must be viewed in profile. The ventral rings are 
of rather peculiar form; the basal one very short in the middle and scarcely longer 
there than the following two together, and the fourth longer than those preceding it ; 
the terminal plate is not impressed. The under surface is much less pubescent than 
the upper. 
17. Batrisus lamellipes. 
Major, elongatus, castaneus, nitidus, breviter parce pubescens; elytris intra humeros impressis, basi quadri- 
foveata, plica discoidali abbreviata. 
Long. 3 millim. 
Hab. Panama, Bugaba (Champion). 
This species bears a great general resemblance to B. crassipes, but exhibits some 
very important differences: the pubescence of the surface, especially on the anterior 
parts, is quite minute; the eyes are smaller and but little prominent; the anterior 
elevation of the head is separated from the vertex by a deep depression, the depression 
scarcely angular in form; the ninth and tenth joints of the antenne are scarcely at all 
broader than the others, the terminal joint being very large ; the legs are considerably 
broader, with the tarsi shorter and thicker, and the femora more compressed and 
lamellate; the terminal joint of the maxillary palpi is of a different and more peculiar 
form, being more slender, with its inner margin concave. 
The unique example is probably a female, the metasternum being but little impressed 
and having only an excessively minute angular prominence on each side of the impres- 
sion. The ventral rings are rather elongate, except the basal one, the latter in the 
middle being scarcely so long as the fourth. 
BATOCTENUS. 
Corpus sat elongatum ; caput muticum, absque tuberculis antennariis ; antenne inter se parum distantes, cras- 
siuscule ; oculi magni; prothorax parum elongatus, absque sulculis, ad latus utrinque foveatus; elytra 
striis discoidalibus subtilibus duabus ; abdomen haud marginatum, segmento dorsali primo quam secundum 
paullo longiore, segmentis ventralibus primis et secundis subsequalibus. 
