Beetles of British Guiana. 79 
among the Prionidae the abnormal development of the 
jaws and teeth is confined to the male sex. This family 
of beetles is largely represented in British Guiana. The 
Cerambyx barbicornis, called by LATREILLE Lophono- 
cerus barbicornis from the Greek lophos, a tuft, and 
keras, a horn, belongs to this family. The five lowest 
joints of the antennae are covered with tufts of blackish 
hair; the apexes of these joints and the six naked joints 
towards the extremities of the antennae are yellow. Its 
head and thorax are dull yellow, spotted with black, and 
its wing-cases are black, variegated with reddish yellow. 
It is seldom met with on the coast, but may be found a 
short distance inland. 
The Chlorida /estiva is a handsome green beetle of 
this family which sometimes makes its appearance in 
our houses in the evening. 
Another interesting section of the Longicornes is the 
Lamaria (from lamia, a witch). This family differs from 
the former mainly in the structure of their head and 
palpi. The most singular of these is the Acrocinus 
longimanus or Harlequin beetle. On looking at it, one 
is struck by the disproportion of its parts and the 
grotesque variety of its colouring. Its antennae are about 
twice as long as its body and its front pair of legs are 
fully as long as its antennae, hence it is called longi- 
manus or " long-handed." Its ground colour is black, 
variegated with red and grey mixed somewhat like the 
dresses worn by the stage clowns, from which circum- 
stance it is called the Harlequin beetle. There are two 
triangular patches of red on its head, and two lines of 
red on its thorax ; there is also a band of red on each of 
its legs near the second joint, and its wing-cases are 
