192 HETEROMERA. 
sides slightly rounded and converging from the base, the apex broadly but not deeply arcuate-emarginate’ 
the anterior angles obtuse and not prominent, the base very deeply bisinuate, the hind angles produced 
behind and slightly overlapping the elytra, the surface almost smooth; scutellum triangular ; elytra a 
little wider than the prothorax at the base, rounded at the sides, widest about the middle, regularly 
punctate-striate (the punctures shallow and closely placed), the interstices smooth, a little darker in colour 
than the prothorax; legs and antenne (entirely) light ferruginous ; beneath (and the epipleure) reddish 
brown, shining, very sparingly and finely punctured ; legs rather slender ; posterior tibie in the male thin 
towards the base, slightly widened on their inner side from the basal fourth to the apex. 
Length 43 millim. (¢ @.) 
Hab. Mexico, Cordova (Sallé). 
Two examples. Of the size of the North-American P. ruficorne, but of the shape of 
P. nicaraguense; from the last named species P. oculatum may be known by its very 
much smaller size, differently formed head and eyes, and the produced hind angles of 
the thorax. ‘The hind tibie in the male are formed as in P. rotundatum. 
17. Platydema nicaraguense. 
Subrotundate ovate, convex, dark reddish brown, opaque. Head (comparatively) coarsely rugulose, slightly 
shining, the epistoma well-defined at the sides and posteriorly by a distinctly impressed groove; eyes 
narrow, strongly oblique, large, and extending inwards ; prothorax transverse, the sides slightly rounded 
and converging from the base, the apex feebly arcuate-emarginate, the anterior angles rounded and not 
prominent, the base strongly bisinuate, the surface almost smooth, reddish brown, here and there 
indistinctly infuscate; scutellum triangular, reddish brown ; elytra a little wider than the prothorax at 
the base, distinctly margined, the sides rounded, finely punctate-striate (the punctures approximate, the 
striee more deeply impressed towards the apex), the interstices smooth, dull dark brownish black, the base 
narrowly reddish brown, distinctly pruinose ; epipleure, legs, the antenne (entirely), and beneath, rather 
light ferruginous; legs finely setose, the tibia rough; beneath shining, very evidently and rather 
closely punctured. 
Length 73-7? millim. 
Hab. Nicaracua, Chontales (Belt). 
Two examples. Comparatively less rotundate than P. rugiceps, of a peculiar reddish- 
brown tint, the head rugulose, the elytra evidently pruinose, the legs and antennz 
entirely ferruginous ; of described species it is nearest allied to P. globatum, Lap. & 
Brullé, from Brazil. 
18. Platydema immaculatum. 
Ovate, convex, ferruginous, opaque. Head slightly shining, closely and finely punctured, transversely impressed 
in front, the epistoma well-defined at the sides and posteriorly by a rather deep groove; antennw 
comparatively short, stout, the three basal joints, and the extreme apex (indistinctly), red, the rest black, 
joints 7-10 strongly transverse ; prothorax transverse, the sides feebly rounded and converging from the 
base, the apex broadly and somewhat deeply emarginate, the anterior angles obtuse and rather prominent, 
the base bisinuate and with a narrow very oblique impression on each side, the surface smooth ; scutellum 
large, triangular ; elytra feebly rounded at the sides, scarcely wider than the prothorax at the base, widest 
about the middle, regularly punctate-striate (the punctures rather coarse and deep, and not very closely 
placed), the interstices smooth ; palpi and legs red, the tibia rough, and setose on their outer edge ; 
beneath ferruginous, shining. 
Length 53-7 millim. 
Hab. Panama, Volcan de Chiriqui, David (Champion). 
