574 MONOTOMIDZ. 
space along the middle smooth, and with a more indistinct, smooth, lateral space on 
each side; there is no basal impression. Elytra regularly striate ; the striz do not 
reach quite to the apex, they are finely punctate, but the punctures are very narrow. 
The pygidium is rather coarsely punctured ; each puncture on the upper surface bears 
a seta so minute as to be evident only on careful examination. Nine specimens. 
The male is larger and broader than the female, and has the head unusually large. 
The supplementary segment is large and distinct. The basal ventral segment is hairy 
along the middle. The female has quite the appearance of a species of Rhizophagus. 
BACTRIDIUM. 
Baciridium, Leconte, Classif. Col. N. Amer. ed. 1, p. 86 (1861) ’. 
Leconte established the genus Bactridium in a very unsatisfactory manner for 
two species, without naming one as the type. I think we may take the first he 
mentioned as the type of the genus. If we adopt this view, certain of our species 
appear to belong really to it, being congeneric with B. ephippigerum, the species in 
question. They are distinguished by the short broad form, by the broad intercoxal 
process of the abdomen, which is straightly truncate in front, and by the extremely 
short intermediate abdominal segments, each of which bears a series of closely-placed 
deep punctures. These characters are exhibited in our B. divisum, as well as in 
B. ephippigerum. All the other species will probably have to be eventually removed 
from the genus. Crine, Pascoe, is at present correctly referred to Bactridium, but will 
probably also be separated. Mimemodes, Reitt., also, cannot be at present distinguished 
from Bactridium. 
1. Bactridium divisum, sp. n. 
Breve, depressum, nitidum, piceum ; antennis, pedibus elytrisque rufis, his apice fuscescente; capite pro- 
thoraceque nigricantibus, hoc transverso, subtiliter punctato, area lata ante basin levigata; elytris striis 
internis obsoletis. 
Long. 1? millim. 
Hab. Guatemaa, Zapote (Champion). 
Club of the short antenne very large. Head very short, eyes placed close to the 
thorax, no free angles behind them ; surface finely punctate. Thorax transverse, the 
angles not obtuse, very sharply marked, the sides a little narrowed in front, so that a 
very obscure angle is formed in front of the middle; very shining, rather finely and not 
closely punctate, with a broad,,very well-marked smooth area, a little depressed behind, 
in front of the base. Elytra with a very fine sutural stria, the next two strie obsolete, 
two others outside this distinct and finely punctured ; a sixth series of punctures exists 
just outside the shoulder. The pygidium is coarsely punctate. Seven specimens; one 
of them is of a pallid red colour. 
