BATRISUS. 15 
Mas capite anterius in spinam elongatam acutissimam, anterius prominulam, producto; antennis medio parum 
curvatis ; tibiis anterioribus apicem versus sat inflatis. 
Hab. GuatTEMALA, Quiche Mountains 7000 to 9000 feet (Champion). 
This species also I must describe from a single male. The antenne are unicolorous 
yellow, slightly curved from the sixth to the eighth joints, this latter being prolonged 
and acuminate beneath; the ninth and tenth joints not very much larger than the 
others, each not longer than broad; the terminal joint large, as long as the preceding 
three together. Head black; produced in the middle in a forward and upward 
direction so as to form a spine or horn with extremely acute point. The elytra are 
rather elongate, and contrast strongly in colour with the black hind body, the shoulders 
slightly plicate-elevate. The front tibie are distinctly inflated before the extremity ; 
the middle tibiz finely mucronate at the apex. The apical ventral segment is slightly 
impressed. 
10. Batrisus armatellus. 
Nitidus, parce pubescens; antennis pedibusque rufis ; capite haud plano; elytris basi sexpunctatis. 
Long. 2 millim. 
Mas sanguineo-castaneus, capite inter antennas spina obliqua suberecta armato. 
fem. castanea, capite mutico, elytris lateribus et humeris rotundatis. 
Hab. Panama, Bugaba, Volcan de Chiriqui 2000 to 4000 feet, David (Champion). 
The male of this species differs from the same sex of B. curvicornis and its allies in 
having the front tibie and the antenne normal in structure, while the head exhibits 
remarkable sexual peculiarities. In this sex, just between the insertion of the antenne, 
there arises a spine or short horn, broad at the base but acuminate at its free extremity ; 
this spine or horn is directed obliquely backwards and upwards, and behind it is a 
transverse depression, the depression almost divided into two parts by the spine, but 
in the middle behind the apex of the spine with a prolongation backwards; there is an 
indistinct fovea near each eye; the middle tibize are armed at the apex with a very 
evident mucro, and the trochanters of the same pair of legs provided behind with a 
patch of short pubescence ; the last ventral segment is largely but not at all deeply 
impressed ; and the antenne are slightly larger than those of the female. The sexual 
characters are quite sufficient for the identification of the male; the female, however, 
is very different, it being less rufescent in colour, and with the elytra shorter and 
completely rounded at the sides and shoulders. ‘The female may be distinguished from 
the corresponding sex of B. simplicicornis and its allies by its larger and longer 
antenne, the sixth and seventh joints especially being larger; and still more decisively 
by the structure of the head, which is but little shining, and is minutely punctate and 
pubescent on each side near the eye, the vertex behind being a little convex in the 
middle and rather indistinctly foveolate on either side. 
