COLASTUS.—BRACHYPEPLUS. 277 
19. Colastus truncatus. 
Nitidula truncata, Randall, Boston Journ. Nat. Hist. ii. p. 18°. 
Colastus truncatus, Lec. Col. Lake Sup. p. 2227; Horn, Trans. Am. Ent. Soc. vii. p. 283 *, 
Colastus infimus, Er. in Germ. Zeitschr. iv. p. 245‘; Murray, Trans. Linn. Soc. xxiv. p. 281°. 
Hab. Nort America‘, United States 1235—Mexico®; Guatemata, Yzabal (Sallé), 
Guatemala city, San Gerénimo, Capetillo, Zapote (Champion).—BraziL*; ANTILLES, 
Guadaloupe (coll. Fleutiaur), Puerto Rico ¢. 
20. Colastus aberrans, sp. n. (Tab. VIII. fig. 19, ¢ .) 
Brevis, sat convexus, subtiliter densissime punctatus et pubescens, opacus, colore instabili, fuscus vel nigro- 
fuscus; abdominis tantum segmentis duobus expositis. 
Long. 3 millim.; lat. 14 millim. 
Hab. Guatemata, Cerro Zunil (Champion). 
Head densely punctate. Thorax large, convex, rounded at the sides, the hind angles 
obtuse, the surface densely and finely punctate and pubescent. Scutellum large, densely 
and finely punctate. Elytra with rather close, very fine punctuation, not in the least 
serial in its arrangement. 
We have received only three examples in very decayed state of this peculiar insect ; 
it superficially resembles C. truncatus, but is much more convex, and has only two 
dorsal segments exposed, and in fact is very different from any other species of the 
genus. C. aberrans evidently varies a good deal in size and colour; our figure is taken 
from the largest individual, a male. 
BRACHYPEPLUS. 
Brachypeplus, Erichson, in Arch. fiir Naturg. viii. 1, p. 148 (1842), and in Germ. Zeitschr. iv. 
p. 245; Murray, Trans. Linn. Soc. xxiv. p. 286. 
This genus was proposed by Erichson for two insects from Tasmania, but subsequently 
many others from various regions have been added to it. As at present constituted it 
is extremely heterogeneous, and requires a careful examination, and no doubt division. 
Murray has established several subgenera in it; but the only important characters he 
gives are based on distinctions in the trophi, and cannot, therefore, be of practical use 
in the present rudimentary condition of collections—a large number of species being 
known by so few specimens that the ligula cannot be dissected. 
Several species of the genus have been described from South America and the 
Antilles; but it is represented in North America only by a single species found very 
rarely in Florida, and possibly of West-Indian origin. Seven are here noticed as 
occurring in Central America. 
