COLEOPTKUA. 89 



ronnrled, nude, pnnctiform fovea ; at each side there are two erect setae much 

 longer than the puhescence. Elytra at base very sliglitly wider than the 

 base of the pronotum ; sides very strongly divergent posteriorly and strongly 

 arcuate ; together transversely truncate behind ; disk fully one-fifth wider 

 than long, rather strongly convex, very remotely and excessively feebly 

 punctulate ; sutural striae very approximate, well marked and straight ; 

 between each stria and the suture there is a row of minute and rather well- 

 marked punctures ; each elytron has three small, rather feebly impressed 

 nude foveae at base ; humeri prominent. Abdomen at base as wide as the 

 elytra, segments rapidly and arcuately decreasing in width ; surface mode- 

 rately convex, not punctate ; border obsolete, except on the first segment 

 where it is feeble ; first segment very long, nearly as long as the remainder 

 together when viewed from above, having in the basal two-fifths two very 

 distant strong carinae, which are very feebly convergent ; first ventral seg- 

 ment having at each side just below the prolongation of the elytral edge a 

 very long, strong, basal carina ; penultimate ventral segment very large, 

 having in the middle a very large circular and very deep excavation, one- 

 fourth as long as the entire abdomen. Anterior tibiae strongly toothed ; 

 femora all strongly fusiform. Length 1.4 mm. 



Tampa, Florida (Scliwarz), 1 %. 



I have retained the genus Arthmius Lee. distinct from Batrisus. at 

 least until the genus Batrisus can be reinvestigated, because of the 

 very different form of the body, the very elongate basal segment of 

 the abdomen, the peculiarities of the pronotum and antennae, and the 

 very singular deep excavation of the penultimate ventral segment. 

 The present species differs from (//obicollis Lee. in its much more 

 slender form, darker color, structure of tlie antennae, and n)ore par- 

 ticularly in the form of the abdominal excavation, wliich in (jlohicollls 

 is not circular biit broadly lunate. The middle tibiae in both these 

 species, at least in the males, have a single acute terminal spur; the 

 tooth of the anterior tibiae is deeply excavated anteriorly, the exca- 

 vation extending obliquely along the tibia. 



BATRISUS Aube. 



B. denticollis n. sp. Mule. — Form slender. Color black, elytra dark 

 rufo-piceous, antennae, legs, and palpi dark rufo-testaceous ; integuments 

 highly polished ; pubescence long, sparse and coarse, erect and herissate, 

 slightly more dense on the abdomen. Head large, slightly wider than long ; 

 eyes small, prominent ; interocnlar surface elevated abruptly very far above 

 the eyes, generally nearly flat above, having two very large circular, feebly 

 impressed spongy-pubescent foveae on a line with the eyes, and mutually 

 nearly twice as distant as either from the eye, intermediate surface rather 

 convex, with feeble traces of a narrow medial longitudinal carina; the two 

 foveae are connected by an anteriorly arcuate rather feebly impressed chan- 

 nel ; supra-antennal tuberculations very large, flat, coarsely and distinctly 



