224 HETEROMERA. 
XENIUS. 
Mentum small, trapeziform, longitudinally raised in the middle, the sides deflexed ; ligula broadly exserted ; 
‘labial palpi very stout; last joint of the maxillary palpi triangular, broad; mandibles truncate at their 
apex; head long, broad, not deeply sunk into the prothorax, the epistoma broadly truncate in front and 
distinctly defined, similar in both sexes, the antennary orbits rounded and reaching halfway across the rather 
narrow eyes; antenne 11-jointed, gradually widening outwardly, the first joint rather stout and ovate, the 
second very short, the third more than twice as long as tbe second, the fourth and fifth shorter, the sixth 
rather wider and subtriangular, the seventh and eighth broader and shorter, the ninth and tenth transverse, 
the eleventh twice the length of the tenth and rounded at the apex; prothorax rather broader than long, 
the apex deeply and broadly emarginate, the anterior angles very prominent, the base strongly bisinuate 
and closely embracing the elytra, the lateral margins crenulate ; scutellum large, scutiform, not entering 
the middle of the base of the prothorax; elytra convex, broad, very much wider than the prothorax at 
the base, the humeri broadly rounded, with irregular rows of coarse smooth tubercles; legs long, stout, 
coarsely roughened; tibie slightly curved at the apex, the spurs very short and almost obsolete; tarsi 
clothed with silky hairs beneath, the first joint of the posterior pair rather longer than the second and 
third united, the last joint longer than the three others together; prosternum broad, horizontal, margined 
within, the apex produced and received by the broadly concave face of the mesosternum ; intercoxal 
process broad, rounded; epipleure very broad at the base, narrowing behind, and abruptly ending at the 
last ventral suture; upper surface tuberculate, glabrous; third and fourth ventral segments with distinct 
coriaceous hind margin. 
This genus will be readily identified from our figure; it contains a single species 
from Nicaragua. I can suggest no near ally to Xenius, though an undescribed genus 
from Colombia slightly approaches it; the genus should be placed near Bolitophagus. 
1. Xenius scabripennis. (Tab. X. figg. 7; 7a, labium ; 76, maxilla and 
maxillary palpus.) 
Dull black, glabrous. Head coarsely and shallowly rugulose ; prothorax widest before the middle, the sides 
slightly sinuate before the base and with about five or six crenatures, the anterior angles very prominent, 
broad, and much produced, the posterior angles subacute, but not outwardly directed, the disc with a very 
broad, transverse, sinuous depression before the base and a shallow central groove, the surface coarsely 
but shallowly rugulose, and with some small longitudinal elevations on each side of the anterior disc, the 
broad basal depression almost smooth; scutellum shallowly and finely punctured; elytra more shining 
than the prothorax, subparallel, widest a little beyond the middle, thence obliquely narrowing to the apex, 
with irregular rows of rather coarse rounded shining tubercles and numerous sinuous rows of impressions 
(the latter are shallowly impressed towards the suture, but become deeper and coarser towards the sides) ; 
legs and antenne black; ventral surface shining, finely and shallowly punctured, and longitudinally 
wrinkled. 
Length 8 millim. (¢ 9.) 
Hab. Nicaragua, Chontales (Belt, Janson). 
Four examples. 
CALYMMUS. 
Calymmus, De}. Cat. 3rd edit. p. 215; Pascoe, Ann. & Mag. Nat. Hist. 4th ser. viii. p. 349 (1871). 
Some few species of this Tropical-American genus are known; one of these is gene- 
rally distributed in our country, whence we now add another species. C. (Zoxicum) 
berardi, Montr., from Lifu, belongs to another genus. Calymmus may be known by 
