BATOCTENUS. 19 
Although closely allied to the polymorphous Batrisus, and without any one very 
salient point of difference, yet the insects I include in Batoctenus exhibit so many minor 
distinctions as to constitute the genus a very distinct one. The palpi are shorter than 
in Batrisus, and with the terminal joint ovate, acuminate; the head is simple, without 
depressions or any distinct elevation over the antennal insertion; the space separating 
the antenne is narrower ; the eyes are large and coarsely faceted ; on the under surface 
of the body there is but little difference between the length of the first and the other 
ventral rings. ‘The rest of the characters very nearly agree with Batrisus. 
1. Batoctenus simplex. 
Rufescens, elytris sanguineis ; crebrius subtiliter pubescens, parum nitidus; capite opaco, dense subtiliter rugoso- 
punctato ; prothorace fere impunctato. 
Long. 23 millim. 
Hab. Panama, Volcan de Chiriqui 2000 to 4000 feet (Champion). 
The antenne are dissimilar in the sexes, though joints 2-7 differ but little from one 
another: in the female the eighth joint differs from the seventh only in being a little 
longer, the ninth is rather broader, and the tenth still somewhat broader, the terminal 
joint being elongate, stout, and obtusely acuminate; in the male the eighth joint is 
oblong and much larger than the seventh, the ninth joint a little larger than the 
eighth, the tenth shorter than the ninth, the terminal joint very stout. The opaque 
densely sculptured head has no elevations or depressions except the two indistinct 
fover on the vertex. The thorax is nearly as long as broad; much narrowed behind 
and still more so in front. The elytra are elongate, and of a brighter red than the rest of 
the surface ; with the shoulders slightly elevated, and a sutural and two fine equidistant 
dorsal striz extending the whole length. In addition to the peculiar antenne, the 
male is distinguished from the female by the possession of a mucro at the extremity of 
the middle tibia ; and it also has the terminal ventral plate more distinctly impressed. 
Four examples. 
2. Batoctenus puncticollis. (Tab. I. fig. 9, 3.) 
Rufescens, elytris sanguineis, crebrius subtiliter pubescens, parum nitidus; capite opaco, dense subtiliter 
rugoso-punctato; prothorace disco dense punctato. 
Long. 2 millim. 
Hab. Panama, Volcan de Chiriqui 2000 to 4000 feet (Champion). 
Though very similar to 8. simplex, this insect is readily distinguished by the 
punctate thoracic disc. The sexual distinctions are similar, except that the male of 
B. puncticollis has an additional character in the shape of the front tibiz, these latter, 
though slender, becoming slightly broader on the inner face to just below the middle, 
where they again become narrow. 
One pair only was found. 
D* 2 
