BATRISUS. 17 
A single male only has been obtained of this species, and the description therefore 
is of that sex only. 
Antenne elongate, the basal joint largely exposed; with a very elongate club, - 
formed by the four terminal joints—these joints somewhat asymmetric in form, the 
eighth being slightly more incrassate on one side than on the other, the ninth trans- 
verse and with one of its angles evidently acuminate, the tenth also transverse, and 
with one of its faces shining and somewhat impressed, the terminal joint large and 
quite as long as the preceding two joints together. Head broad between the eyes, the 
latter placed quite as near to the antenne as to the neck ; narrowed behind the eyes, 
and bearing on this part an erect pubescence ; its surface uneven, the vertex convex and 
obscurely foveolate on either side of the convexity; depressed between the antennal 
elevations and the vertex, and with a very indistinct carina on either side near the eye. 
Thorax convex, with a minute lateral spine on either side in front of the middle; 
much narrowed behind the denticles, and with two large acute prominences in front of 
the base. Elytra depressed at the base, so that the basal foveation cannot be distin- 
guished. First segment of the hind body rather broadly margined. Hind tibie with 
a distinct mucro at the extremity; middle tibie more feebly mucronate; middle 
femora with a large straight tooth placed almost in the middle. ‘Terminal ventral 
plate small, and only feebly impressed. 
15. Batrisus rivularis. 
Batrisus rivularis, Schauf. Nunq. Otios. ii. p. 285 °. 
Hab. Panama }. 
§ 3. Thorax without longitudinal or transverse channels, unarmed. 
The species I refer to this section represent a new subgenus, which I should have 
treated as generically distinct from the other New-World Batrisi had it not been that 
it shows considerable analogy with the European B. formicarius. 
16. Batrisus crassipes. (Tab. I. fig. 7.) 
Major, elongatus, castaneus, nitidus, crebrius pubescens; elytris intra humeros impressis, basi quadrifoveata, 
plica discoidali abbreviata. 
Long. 3 millim. 
Hab. Panama, Bugaba 800 to 1800 feet, Volcan de Chiriqui 2500 to 4000 feet 
(Champion). 
Antenne thick ; ninth joint but little different from the eighth, the tenth joint also 
only slightly differing from the ninth and scarcely so long as broad, the terminal joint 
very stout. Head narrow, with convex, rather large, finely faceted eyes, the latter 
placed much in front of the hind margin; thickened over the insertion of each antenna, 
so that the front part consists of an elevated transverse portion behind which there is 
BIOL. CENTR.-AMER., Coleopt., Vol. II. Pt. 1, March 1887. D* 
