Memoirs on the coleoptera

52
MEMOIRS ON THE COLEOPTERA
Limnichalia n. gen.
The general characters of this genus conform throughout to those
of others here assigned to the Limnichini, the special modifications
being the sulcate prosternum, the fine, posteriorly arcuate epistomal
suture, the continuous oblique cariniform margins from the eyes to
the epistomal apex, concealing the attachment of the antennae, the
more continuous elytral epipleura, these being sinuated for the tips
of the hind femora in repose, the long pale antennae, with peculiarly
modified second joint and very long loose and gradually broadened
compressed 5-jointed club and the rather long slender tarsi. The
type may be described as follows:
Oval, moderately convex, acutely ogival at apex, polished, pale castaneous
in color, the legs pale brown, the mouth-parts and antennae pale
flavate, the vestiture sparse, consisting of moderately long fine
erect recurved hairs, dusky in color and not variegated; epistoma
strongly reticulate, chagrined and indistinctly punctate, the entire
remainder of the upper surface devoid of fine ground sculpture of
any kind; head with rather large shallow and separated punctures
anteriorly, which fade completely away posteriorly, the latter surface
and entire pronotum with sparse, excessively minute punctules, not
larger than the base of the hairs and not larger or closer laterally
on the latter; prothorax about three times as wide as long, the strongly
converging sides evenly and distinctly arcuate, the basal lobe almost
completely obsolete, the surface evenly convex, not impressed
medially, having, slightly behind the middle, a short transverse and
feebly arcuate series of fine close-set asperulate punctures; scutellum
large, with arcuate sides, acutely ogival, barely longer than wide;
elytra fully a fourth longer than wide, widest near basal third, the
sides evenly rounded, gradually converging and less arcuate poste-
riorly to the rather acute apex, very finely, feebly, rather sparsely
punctulate; abdomen narrowly parabolic, convex, moderately
shining, finely, feebly, asperulately but rather closely punctate,
the hairs longer and more numerous posteriorly, pale, yellowish,
the sutures fine, the last two but slightly more distinct than the
two anterior. Length 1.6 mm.; width 0.85-0.9 mm. Isthmus
of Panama (Colon) *colonica n. sp.
As before stated Eulimnichus sublavis, of Sharp, described from
Guatemala, also belongs to this genus but differs in its darker color,
stronger sculpture and less distinct vestiture; there are doubtless
many other Central American species, among which the minute
Eulimnichus ephistemus Sharp, may be included.
There are two other Central American genera assigned by Dr.
Sharp to the Limnichini, besides Phalacrichus and Limnichalia here