262 (April, 
punctured, except the part next to the scutelluam. The elytra are but little convex, 
~ much hollowed out before each humeral angle, at their greatest width rather less 
broad than the thorax, 1} times the length of the width at the shoulders, rounded 
at the base, broadest about the middle, gradually narrowed to the apex, where 
each elytron is rounded; the humeral angles are strongly reflexed, each fur- 
nished with a spine which is directed backwards; the margins are reflexed; the 
surface is very strongly rugose, very little less so at the apex than at the base. 
The femora and tibiz are strongly punctured, more or less pitchy, especially 
the tibizw; the tarsi are scarcely punctured, pitchy. The abdomen is thickly and 
strongly punctured, the 4th and 5th segments being ruguse, the latter emarginate. 
A smaller specimen of the male of this species has the femora almost black, 
the humeral angles are less strongly spinose, and the mandibles are almost identical 
with those of the female. It is 18 lines in length. 
2. Head smaller, and relatively narrower than in the male, the spine behind 
the eyes more acute and smaller: the mandibles are a little shorter than the head, 
compressed, cultriform, strongly punctured, except on the inner edge; the left 
mandible is somewhat hatched-shaped at the apical half, and there is a small blunt 
tooth near the base on the inside; the apical joint of the palpi is not securiform 
but elongate-triangular, rounded at the apex. Antenne about the length of the 
elytra, with the three apical joints canaliculate. Thorax as in the male. Elytra 
considerably broader than the thorax, very convex, broadest rather below the 
middle, not much contracted towards the apex, where each elytron is very much 
rounded. The abdomen somewhat thickly punctured, especially at the sides (but 
not so much so as in the male), the fifth segment entire. . 
PriIoNocALUS cactcus, White. 
The British Museum has received a pair (¢ and?) of an insect 
from Peru, which I am unable to separate from Pr. cacicus, White, 
although the sizes of the two males are very different ; that from Peru 
measuring (including the mandibles) 30 lines, whilst the type of Pr. 
eacicus is only 17 lines. The mandibles in the Peruvian insect are 
formed almost as in the large specimens of Pr. Buckleyi, but are less 
regularly bowed. The legs appear relatively stouter, and the elytra 
are less opaque. 
The following is the description of the female Peruvian specimen 
of Pr. cacicus :— 
Pitchy-black, sub-opaque ; legs, palpi and antenns (base excepted) red-brown. 
Head sub-quadrate, rather narrowed in front, with a strong acute spine on each 
side behind the eyes, very rugose, with a deep transverse shining impression at the 
front margin; a well-marked smooth ridge runs from the base of the antennz 
backwards to a level with the side spines, terminating in a small tubercle. Thorax 
transverse, twice as broad as the head at the eyes, the anterior angles prominent, 
acute; the sides with three strong spines, the anterior one the shortest ; behind the 
third spine, the thorax is obliquely contracted ; the posterior angles are prominent, 
