COLEOPTERA. 
51 
$ Angustior, elongatiorque: antennis corpore longioribus, minus crassis , 
articulis cylindricis, apice paullo clavatis , clava valde elongata , 
angusta. 
9 Latior breviorque: antennis thoracis medium superantibus , pro sexu 
crassiusculis , e/aw mo dice elongata , latiore. 
Longit. 6^—10 lin. (rostr. incl.) = 14—23 millim. 
Latit. humer. If—lin. = —5 millim. 
Var. (3. Obscurius coloratus, vitta communi elytrorum minus determinata , 
his plagis dorsalibus obsoletis. 
Ptych. Amazonce , Jekel in litt. Nomen nimis circumscriptum , quare 
mutandum. 
Patria: Bogota Columbia), Dom. Goudot; Carlhagena id., Dom. Lebas ; 
Amazona, Para, Dom. Bates. 
Very closely allied to Pt. elongatus, but it constantly differs as 
follows :— 
Body proportionally thicker when seen from the side, more parallel 
and less depressed in the elytra, which are evidently less straightly 
horizontal longitudinally, and with the posterior declevity to the callosity 
greater, being more than 40 degrees, more thickly, convexly and obliquely 
inflected at the sides. The general distribution of the tomentosity is 
exactly the same, but the colours are somewhat different: on the body 
beneath it is of a subsericeous (not cretaceous) white, exactly the colour of 
raw silk; on the common band of the thorax and elytra, of a slightly rosy 
white; on the sides, of a very light fuscous, or rather of a brownish hue, 
more mixed with the rosy colour of the dorsal band: this has its ordinary 
maculae a little more dusky than the colour of the sides (especially the two 
maculae filling the emarginations of the band), but always with a lighter 
aspect than in the pale specimens of Pt. elongatus. This is nevertheless of 
slight importance, as the real differences consist in the lateral outline, the 
thickness of the body and elytra, as well as in the posterior convexity of 
the latter. 
Head evidently shorter in proportion, more convex in front. Eyes 
less elongate, more convex and extended outwards, extending more in 
front towards the rostrum. Rostrum somewhat shorter and narrower in 
both sexes in proportion to the size of the head. Antennce in both sexes 
thinner, especially in the male, in which they seem to be more elongate, as 
