236 HETEROMERA. 
nate and rather long; prothorax longer than broad, narrower than the head, rounded at the sides before 
and strongly constricted behind the middle, the anterior portion transversely convex, the posterior portion 
a little dilated at the base externally, the base distinctly margined, the flanks deeply excavated, the sur- 
face with rather coarse, deep, very widely scattered punctures; elytra broadly truncate at the base, mode- 
rately long, the sides subparallel in front, a little dilated at the middle, and obliquely converging behind, 
moderately convex, and with a shallow quite distinct transverse post-basal depression, the humeri obtuse 
but distinct, the basal fourth with rather coarse scattered punctures, the rest of the surface almost smooth ; 
legs pale testaceous, the tibie usually infuscate in their basal half; fifth ventral segment deeply semi- 
circularly emarginate in the male. 
Length 23-23 millim. (¢ 9.) 
Hab. GuateMALA, Rio Naranjo, San Joaquin, Lanquin, Chiacam ( Champion); _ PANAMA 
(coll. La Ferté).—Co.tomstia * (coll. Oberthiir). 
A. invalidus has much the facies of A. varicornis and A. striato-punctatus, from which 
it may be at once distinguished by the simply rounded (not denticulate) sides of the 
thorax; the antenne are differently coloured; the elytra are more obliquely narrowed 
behind and the punctuation is more irregularly arranged and scarcely extends beyond 
the basal depression. 
This insect frequents the sandy banks of rivers and occurs on both the Atlantic and 
Pacific slopes of Guatemala. 
22. Anthicus concolor. (Tab. X. fig. 15.) 
Moderately elongate, pale castaneous, very shining ; the upper surface clothed with long, erect, scattered hairs, 
those on the elytra serially arranged. Head about as long as broad, rounded at the sides behind, with a 
few very widely scattered minute punctures; the eyes black, comparatively large, coarsely granulated, 
prominent ; antenne entirely testaceous, slender, the apical joint acuminate and comparatively long ; 
prothorax longer than broad, much narrower than the head, rounded at the sides before and strongly 
constricted behind the middle, the anterior portion transversely convex, the posterior portion dilated at 
the base externally, the base margined, the flanks deeply excavated, the surface punctured like that of 
the head; elytra broad, comparatively short, gradually widening to about the middle and there more 
than three times the width of the prothorax, slightly compressed behind the shoulders, and obliquely con- 
verging behind, broadly truncate at the base, the disc flattened anteriorly and moderately convex behind, 
without post-basal depression, the humeri prominent, the surface with very minute widely-scattered 
punctures ; legs long and slender, entirely testaceous. 
Length 2 millim. (9.) 
Hab. GuateMata (Sallé), Rio Naranjo (Champion). 
Four female examples of this insect were captured by myself on the sandy banks of 
the Rio Naranjo, in the Pacific coast-region of Guatemala, and there is a very immature 
example of it in the Sallé collection. The unicolorous, very shining, almost smooth 
surface, slender limbs, and comparatively broad, short elytra, the latter merely 
flattened on the basal portion of the disc, and with the humeri very prominent, chiefly 
distinguish A. concolor. 
23. Anthicus festivus. 
Moderately elongate, pale castaneous, very shining ; the elytra with an indistinct brownish median fascia; the 
upper surface clothed with long, erect, scattered hairs, those on the elytra serially arranged. Head as 
