PIAZURUS. 11 
b'. Anterior femora unarmed; joints 2 and 8 of the funiculus 
subequal in length; prothorax very short, with the sides 
parallel behind; elytra subquadrate, nodose and granulate, 
the transverse depression deep, the apices rounded; first ventral 
segment deeply grooved on each side between the cox, the 
first suture strongly arcuate ; posterior legs very stout . . . guadratus, sp. n. 
6. Posterior tibiz sharply mucronate on the inner edge before the 
apex ; posterior femora only dentate ; prothorax conical; elytra 
with the interstices narrow, seriato-granulate, the apices emar- 
ginate ; joint 2 of the funiculus about twice as long as 8 ; first 
ventral segment with a deep N-shaped groove. [Subgen. Psrupo- [ Heller. 
prazunus, Heller (part.).} . 2. 2... 2. 1 ewe ee centrali-americanus, 
1. Piazurus trifoveatus, sp. n. (Tab. I. fig. 17.) 
Subrhomboidal, black, the antenne obscure ferruginous; the vestiture of the prothorax and elytra fulvous or 
brown, slightly mottled with cinereous, that of the head, scutellum, under surface, and legs almost 
entirely cinereous ; the prothorax with two spots at the base, some markings along the middle of the 
disc, and an oblique marginal vitta, and the elytra with a more or less excised, broad, median fascia 
(extending upward to the shoulders and downward along the suture), a large patch at the sides 
posteriorly, and some irregular markings around the scutellum, velvety-black, the median fascia some- 
times preceded by several white spots, the femora subannulate. Head densely, minutely punctate, the 
eyes subcontiguous ; rostrum densely punctate and carinate at the base, and smooth thence to the tip ; 
joint 2 of the funiculus about one-half longer than 3. Prothorax transverse, subconical, with two large 
shallow depressions on the middle of the disc and one in the centre in front; densely, minutely punctate 
and also carinate. Elytra very much wider than the prothorax, rounded-triangular, transversely 
depressed below the base, the humeri swollen, the apices sharp, obliquely truncated ; punctate-striate, 
the seriate punctures rather coarse on the basal half, the interstices minutely punctate, almost flat on 
the disc. Beneath closely, finely punctate; ventral segment 1 broadly depressed down the middle in 
both sexes, 5 sinuato-truncate, and also feebly foveate, at the apex in the 3. 
Var. The black markings on the prothorax almost obsolete, the depressions indistinct. 
Length 94-128, breadth 43-64 millim. (¢ 9.) 
Hab, Costa Rica, Savanillas de Pirris (Underwood); Panama, Bugaba, Volcan de 
Chiriqui (Champion). 
Eleven specimens, all but one from Chiriqui, and one only with the depressions on 
the prothorax indistinct. This insect has the elytra marked as in P. caprimulgus, 
and the prothorax shallowly trifoveate as in P. plagiatus. ‘The elytra are without 
tubercles on the disc. The Costa Rican example is figured. 
2. Piazurus plagiatus, sp. n. (Tab. I. fig. 18.) 
Piazurus plagiatus, Chevr. in litt. 
Piazurus triangulum, Jekel, in litt. 
Subrhomboidal, black or piceous, the antenne and the tips of the tarsi obscure ferruginous ; variegated above 
with minute fulvous, cinereous, and black scales—the cinereous scales usually condensed into a large, 
interrupted, transverse patch on the depressed portion of the disc of the elytra and various scattered 
spots or streaks, the black scales also condensed into spots and streaks (especially around the cinereous 
dorsal patch, behind which there is always a spot on the swollen portion of the third interstice), and 
sometimes into a marginal vitta on the prothorax ; the under surface also variegate with cinereous (or 
CC2 
