60 
INSECTA SAUNDERSIANA. 
The coloration of this species agrees with that of Pt. elongatus ; its 
rostrum in both sexes is proportionally shorter and narrower, the thorax 
broader, less deeply impressed on the disc, the scutellum scarcely or not at 
all transverse, subquadrate or circular; the elytra nearly as much de¬ 
pressed on the disc, but more convex and obliquely inflected at the sides, 
thicker; finally, the thickness and width of the body are more nearly the 
shape of Pt. tricostifrons , but it is easily distinguished from both, and 
also from all the depressed species of the first group, by having the elytra 
more obliquely and subcircularly slanting behind, and especially by the 
ante-apical callosity nearly obsolete and not breaking the regularity of the 
declivity. It also varies very much in size. 
By the exact semicircular posterior declivity of its elytra, and the 
minuteness of its ante-apical tubercle, this species perfectly unites those 
species having evident callosities with those having none. 
The minute specimens of both sexes, which I called nanus before 
I was acquainted with others intermediate between the large ones and 
these dwarfs, have the scutellum proportionally smaller, exactly cir¬ 
cular ; but I find no other differences. I have, however, not seen such 
proportionally minute specimens in the other species, not even in 
Pt. elongatus. 
Obs. —Very small males of Pt. elongatus , having the antennae shorter 
than the thorax, very much resemble the middle-sized females of this 
species in having their ante-apical callosity less developed than ordinarily, 
but these callosities are always sufficiently elevated: they are much 
narrower, their elytra are also much less obliquely slanting posteriorly, 
as well as flatter when seen from the sides, &c., all which characters are 
more than sufficient to distinguish them from this species, which has been 
confounded with them in several collections. I have seen a number of 
individuals of this species. 
