TREPOBARIS.—PSEUDOBARIS. 425 
Fourteen specimens, mostly in a bad state of preservation. Smaller, narrower, and 
more shining than 7’. elongata; the prothorax a little more coarsely and not so densely 
punctate; the seriate punctures in the elytra finer and more scattered; the apical 
uncus of the anterior tibie elongated in the male. The basally widened third elytral 
interstice separates T. yucatana from T. inornata. 
PSEUDOBARIS. 
Heterosternus, Kirsch, Berl. ent. Zeitschr. 1869, p. 215 (nec Dupont). 
Pseudobaris, Leconte, Proc. Am. Phil. Soc. xv. p. 297 (1876) ; Casey, Ann. N. York Acad. Sci. 
vi. pp. 466, 552. 
This genus is the most numerous in species amongst the Central-A merican 
“ Baridiides vrais.” It is mainly recognizable by the more or less deeply sulcate 
prosternum (the sulcus, however, is scarcely wide enough to receive the rostrum 
in repose); the antennal club is pubescent throughout ; the femora are usually sulcate 
beneath, and sometimes dentate; and the rostrum is moderately elongate, at least in 
the female. Many of the typical forms have the elytral interstices sharply costate on 
the apical declivity, and the third with a patch of white scales at the base * ; others, 
again, have some additional white markings on the disc or base of the elytra, or their 
apices subdentate. The type of Heterosternus (H. carbo, Kirsch) and three of the 
Central-American species have the prosternal sulcus bifurcate between the cox, due 
to the angular or lanciform extension forwards of the basal process of the prosternum ; 
but they are otherwise so closely related to the typical N.-American Pseudobaris that 
it is inadvisable to separate them. ‘There is a considerable sexual difference im the 
form of the rostrum in certain cases, it being often abruptly flattened, smoother, and 
more slender in the females than in the males. P. lucida has the pygidium of the 
female almost covered by the elytra, though large and prominent in the male. 
P. carinipectus has the prosternal sulcus closed in behind by a v-shaped ridge. 
The following table will assist in the identification of the Central-American forms :— 
A. Prosternal sulcus straight, sometimes extending beyond the coxe. 
[Pszvposanis, Lec. } 
a. Pygidium prominent in both sexes, large in @, transverse in ?. 
a. Basal process of the prosternum longitudinally raised or margined on 
each side behind the coxe; femora unarmed; elytra with spots or 
lines of white scales at the base and middle, those at the base mainly 
condeused on the interstices 2 and 6. 
a?, Elytra with a submedian spot on the 4th interstice, and another at 
the base of the 2ndand 6th ... . . . ... + + + + + + Species 1-3. | 
* These scales are often partially abraded, but the additional squamigerous punctures remain to indicate 
their position ; the interstice itself, too, is often widened at this place. 
+ The S.-American Baridius punceticollis, Boh., and B. subceneus, Kirsch, also belong here, and B. corvinus, 
Kirsch, to Pseudobaris, 8. str. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, February 1909. 3 II 
