m 
INSECTA SAUNDERS]ANA. 
species. The rostrum is more widened to the apex than in the other 
species (in proportion to the development of the male above described, 
which I suppose to be of moderate size, from the shortness of its 
antennae) in each sex, and its three dorsal ridges are nearly as broad and 
elevated as in Pt. mixtus. The head has its three frontal ridges well 
indicated, though slender; the front is not more convex than in the latter, 
but flatter than in Pt. virgatus. The thorax is nearly shaped as in the 
two latter species, but it is longer in proportion (the insect being nearer in 
this and some other respects to Pt. virgatus ), and it is more abruptly 
dilated behind the apex, which is more regularly tubular than in any other 
species of the genus; the sides are thence very slightly dilated to the 
posterior carina (very slightly emarginate in the middle), thence obtusely 
angular; they are also obliquely and straightly narrowed to the base, 
where they are not broader than the apex; this, like the head, being pro¬ 
portionally broader than in any other species with which I am acquainted. 
The middle of the disc is more narrowly depressed longitudinally, and the 
central elevation is less transverse than in any other, projecting more, both 
upwards and downwards, so as to make an obsolete cross, strongly 
rugulose; the posterior borders of the impression are also, but obsoletely, 
rugulose. The posterior carina is, as in Pt. virgatus, parallel to the base, 
scarcely sinuated and interrupted, rather farther from the base at the sides 
than in the middle, obtusely angular, then bisinuate towards the apex, to 
which it does not extend. The elytra are nearly formed as in Pt. mixtus, 
and are less evidently depressed along the suture, and less broadly dilated 
from the posterior angles of the thorax to the shoulders; these are more 
rounded, exactly as in Pt. virgatus. Being slightly narrowed behind in 
the male above mentioned, I suppose that in larger specimens, if they 
exist, the elytra would be more narrowed than in the large males of 
Pt. virgatus, and consequently as in those of Pt. elongatus and nehulosus. 
Obs. —I have seen but few specimens of this species. 
