12 PSELAPHID&. 
all spinose) ; the middle tibize are mucronate at the extremity; and the antenne havea 
curve extending from the fourth joint to the seventh, and the fourth joint is slightly 
enlarged beneath. The female is not known, but I think it likely that B. quadri- 
punctatus, which Schaufuss received from the same source as his B. curvicornis, may be 
the other sex of this species. Reitter’s tabulation 2 unfortunately also needs emendation, 
as the form of the elytra (which has led him to place B. guadripunctatus in a different 
group from B. curvicornis) is in these insects a sexual character. 
3. Batrisus quadripunctatus. 
Batrisus quadripunctatus, Schauf. Nunq. Otios. ii. p. 273°; Reitt. Verh. z.-b. Ges. Wien, 1882, 
p- 378 ”. 
Hab. Mexico (Bilimek ?, in coll. Reitter), Yucatan 1, Jalapa (Hoge). 
As mentioned above, under B. curvicornis, I believe this may prove to be the female 
of that species; but as I cannot state this with certainty, I do not venture to sink the 
name at present. B. quadripunctatus is scarcely distinguishable from the females of 
B. geniculatus and B. simplicicornis, except that the antenne are decidedly shorter than 
those of the latter, slightly shorter than those of the former, species, and have the sixth 
and eighth joints more distinctly smaller than those contiguous to them. Although 
Schaufuss in his description of B. curvicornis + expresses himself as having both sexes 
of the species before him, yet it is more likely that his supposed female was a male 
of some other species having simple antenne, such as B. simplicicornis ; for the differ- 
ence in form of the sexes in this subgenus has not before been correctly dealt with— 
the females, in fact, having been treated as a section of the genus distinct from that 
of their consorts. 
4. Batrisus simplicicornis. (Tab. I. fig. 6, ¢.) 
Rufo-testaceus, nitidus, parce pubescens; antennis pedibusque testaceis, illis parum elongatis; capite plano, 
levigato, utrinque foveolato. . 
Long. vix 2 millim. 
Mas tibiis anterioribus gracilibus, ultra medium paullo latioribus, apice constricto. 
Hab. Guatema.a, near the city (Champion). 
Extremely similar to 2. curvicornis and B. geniculatus, but with strongly marked 
differences in the male characters. In this sex the antenne are quite straight; the 
front tibie only slightly broader from the base to below the middle, but there suddenly 
though only slightly contracted; the middle tibie armed with a mucro at the terminal 
inner angle; and the hind body beneath has a large transverse depression at the extre- 
mity. The female is of a more castaneous colour, and has shorter elytra, and slightly 
shorter antenne, than the male; I can only distinguish this sex from the female of 
B. geniculatus by the antenne being slightly longer and stouter, and the thorax just 
perceptibly more elongate. 
