PLATYDEMA. 191 
size of the smallest individuals of that species, from which it is distinguished by the 
differently formed antenne, and the deeper and coarser punctures of the elytral strie. 
14. Platydema rotundatum. 
Platydema rotundatum, Chevr. Petites Nouv. Ent. ii. p. 186°. 
Hab. Mexico! (coll. F. Bates), Jalapa, Vera Cruz, Esperanza (Hége), Playa Vicente, 
Cordova (Sallé) ; Guatemaua, Duefias, Zapote, Cerro Zunil, San Gerdénimo (Champion). 
Many examples. In Mr. F. Bates’s collection two perfectly distinct species are each 
labelled (apparently in Chevrolat’s handwriting) “ P. rotundatum, Chevr., type”: one 
from Mexico, agreeing with our species and with the description ; the other from Para 
and differing in having much larger and more oblique eyes, &c. P. rotundatum may be 
known from the allied species by its short broad form, rounded sides, and the fine and 
lightly impressed elytral striae; the antenne are usually reddish-piceous, in some 
examples, however, the last three or four joints are darker; in the male the posterior 
tibiz are slightly sinuous and widened from the middle to the apex; it varies in size 
from 5-8 millimetres. 
15. Platydema rugiceps. 
Rotundate ovate, convex, velvety-black, opaque. Head broad, short, subrugose, shining, the epistoma well- 
defined at the sides and posteriorly by a shallow but distinct groove, the eyes widely separated ; antenne 
dark ferruginous, the two or three basal joints, and the extreme apex, slightly paler ; prothorax broad, 
strongly transverse, the sides slightly rounded and converging from the base, the base (strongly) and apex 
bisinuate, the anterior angles slightly prominent but obtuse, the surface smooth; scutellum rather large, 
triangular ; elytra the width of the prothorax at the base, narrowly margined, strongly rounded at the 
sides, widest before the middle, somewhat acuminate behind, very shallowly and finely punctate-striate 
(the punctures not very closely placed), the interstices smooth ; legs and epipleurx reddish brown ; beneath 
reddish brown, shining, sparingly and finely punctured. 
Length 64-73 millim. 
Hab. Mexico, Cordova (Sallé); Guatremata, Cahabon (Champion) ; Nicaragua, 
Chontales (Belt, in coll. F. Bates). 
The rotundate form, and the shining and rugose head, will readily distinguish this 
species amongst its allies; from P. rotwndatum it may be known by the broader and 
differently sculptured head, and the elytra more acuminate behind; and from 
P. globatum, Lap. & Brulle, from Brazil, by the darker antenne, larger head, &c. A 
closely allied undescribed species is found at Chanchamayo, Peru. 
The four examples before me have the hind tibie similarly formed, and without 
curvature or narrowing at the base ; possibly they are all females. 
16. Platydema oculatum. 
Subrotundate ovate, convex, dark reddish brown, opaque. Head slightly shining, the frontal half red, very 
finely and sparingly punctured, with a shallow impression on each side before the eyes, the epistoma 
defined by a fine impressed line ; eyes large, oblique, not widely separated ; prothorax transverse, the 
