96 RHYNCHOPHORA. 
margin forming the upper border of the terminal impression, which is subcircular, oblique, and quite 
opaque, divided by an obtuse emargination at the suture and a deep excision on either side into four 
processes, the two outer small and pointed, the inner processes obtuse, larger, extending farther downwards 
and backwards. Abdomen coarsely and rugosely punctured, its apical segment longitudinally carinate. 
Hab. Costa Rica, Irazu (Rogers). 
Four males were taken of this species, which is much smaller than any other 
described member of the Platypi truncati. In structure it most resembles P. abbre- 
viatus, Chap. 
Division PLaTYPI coroNATI, Chapuis. 
2. Platypus acutidens, sp. n. (Tab. IV. figg. 2, ¢; 2a, apex of elytra; 
2b, anterior tibia: 8,9; 8a, anterior tibia.) 
Ferrugineus ; prothorace suboblongo; elytris apice nigricantibus ; subtus cum antennis pedibusque testaceus. 
Mas. Fronte fere plana, areolata; elytris striato-punctatis, interstitiis 1°, 3°, 5°, 7° et 8° haud declivibus in 
spinulas productis, 3° longiore, depressione postica obliqua utrinque in processum cylindricum ad apicem 
emarginatum producta. 
Long. 6°5 millim. 
Fem. Fronte plana, antice punctata, postice areolata ; prothorace poro in utroque sulci latere ornato ; elytris 
substriatis, interstitiis 3° et 5° subelevatis, depressione postica subconcava, angulis lateralibus distinctis. 
Long. 7 millim. 
Male. Evidently closely allied to P. dohrni (2), Chap., from the description and figure of which species it can 
only be differentiated as follows :—The elytra are twice as long as the prothorax, the spine of the third 
interval is fully twice as long and much larger than those of the Ist, 5th, 7 th, and 8th interstices, which 
are equal in length; the spine of the last is placed nearer the apex. The terminal process becomes a 
little thicker towards the tip, which is obliquely excised at the apex and inner side, so that its margin 
seen from behind is semicircular, being convex on the outer side with the inner, upper, and lower angles 
somewhat prominent. Posterior coxe produced into a short triangular tooth. 
Female. Indistinguishable from P. dohrni (3), Chap., by the description alone. The smooth line of the vertex 
is bounded on either side by a closely rugose space, outside which the vertex is shining, with scattered 
punctures. The terminal depression is subconcave, its inferior border is nearly straight, the lateral angles 
prominent but blunt; the sulcus separating it from the horizontal portion is deep and bounded externally 
by a distinct tubercle above the lateral angle. 
Hab. Guatemata, Capetillo (Champion). 
Four examples. The species is without doubt distinct from P. dohrni by characters 
which are too important to have been overlooked by Chapuis, or to be judged as 
varietal. Unfortunately the impossibility of seeing typical specimens of that species 
has prevented an exact differentiation, particularly of the females. The female of 
P. acutidens can be distinguished from that of P. putzeysi by the structure of the apical 
im pression. 
3. Platypus dohrni. 
Platypus dohrni, 8 ¢ (lege @ 6), Chap. Mon. Plat. p. 115, fig. 37°. 
Hab. Mexico}. 
