LOGANIUS.—BOTHROSTERNI. 131 
as prothorax and a third longer, closely applied at base, subparallel-sided to middle, thence obliquely 
_incurved, separately rounded at apex; shining, striate, the stric weak and obsoletely punctured, inter- 
stices subconvex, with a few indistinct punctures and rug, and behind middle with a single series each 
of very short scale-like bristles. Underside black, finely reticulate and punctured. Legs black, tarsi 
testaceous ; spines of middle and posterior tibiz quite straight. 
Hab. Panama, Volcan de Chiriqui (Champion). 
But one example, apparently a male, of this distinct little species was obtained. 
The strigillation of the prothorax gives it a certain likeness to a small Cnesenus, from 
which genus the appendiculate funiculus and the mucro of the anterior tibie clearly 
separate it. 
Subgroup III. BOTHROSTERNI. 
The distinguishing-characters of this subgroup are as follows :—Antennz inserted at the sides of the rostrum 
in a fossa, bounded in front by a ridge and continued on to the gula by a sulcus, with a moderately long, 
not strongly clavate scape; the club oblong or oval, flattened, 4-articulate, crossed by straight or curved 
sutures, which with the apical joint are pilose *, Maxille: with a narrow internal portion, its tip rounded, 
the armature consisting of flattened spines ; maxillary palpi with joints successively decreasing in width, 
the first two very short and transverse, the third much longer than broad. Mentum as broad as long, 
shield-shaped, truncate at the apex ; ligula inserted at its base, narrowed apically and extending a little 
beyond its apex, its tip pilose; labial palpi with the first joint ample, conical, the second very short, 
transverse, the third narrow and longer than broad. Prothorax with or without a raised side-margin, 
in the latter case the flanks are impressed and the side-margin is obscurely defined ; its surface punctured 
or usually strigillate, its base more or less overlapped by the elytra. Tibia not stout, the an erior pair 
dilated towards apex, of which the upper angle is prolonged beyond the tarsal articulation into a flattened 
lobe, bifid and produced into recurved spines, upper margin with a single tooth towards apex ; middle and 
hinder tibicee with a small simple or bifid tooth at the upper apical angle representing the apical process 
of the anterior tibix, and usually ill-developed, their upper margin with one, rarely two, minute 
spinous teeth. ‘arsi short, the first three joints stout, subequal, the third not or scarcely widened, 
emarginate at tip, last joint shorter than the preceding. Body oblong-oval or elongate, rarely with 
subsquamous pubescence. 
The Bothrosterni have been retained in the Hylesinides by both Chapuis and 
Leconte. Though less intimately related to the Scolyti and Camptoceri than those 
subgroups are to each other, their connexion with them appears to me to be 
undoubted; and the smaller species of Loganius approach the Bothrosterni so nearly in 
appearance as to require a careful scrutiny of the antenne and tibie before their place 
can be determined. The characteristic tibial structure of the present subgroup is 
always difficult to observe on the middle and hind legs, and may be overlooked in small 
forms. This, indeed, was done by Chapuis in Nemophilus (Cnesinus), although the 
processes are easily visible in his type specimen of XN. strigillatus (=C. strigicollis) ; and 
even Leconte and Horn appear not to have noticed the essential identity in structure 
between the tibise of Bothrosternus and Cnesinus. ‘The mouth-parts show no material 
differences in species of three genera examined. 
* Ag with other Scolytids possessing a four-jointed club, the apical suture is quite indistinct, being 
represented only by a row of hairs, and entirely untraceable in a balsam-mounted specimen. 
SS 2 
