374 Mr. G. C. Champion on the Tenebrionide 
wider than, the prothorax, subparallel to a little beyond the middle, 
regularly punctate-striate, the punctures rather fine and very 
closely placed, the interstices flat, densely, very finely punctate ; 
beneath closely, finely punctate, the metasternum smoother ; pro- 
sternum very narrow, parallel, produced behind ; epipleura ex- 
tending:to the last ventral suture; legs slender. Length 3;—3}, 
breadth 14 mm. 
Hab. N. W. Australia—Adelaide River. 
Seven examples. This species is allied to P. tetras- 
pilotum, Hope, but is smaller, flatter, and more 
parallel, the thorax rounded at the sides, and distinctly 
narrowed behind. This last-mentioned character, com- 
bined with its subparallel shape, gives it a different facies 
from most of the other representatives of the genus. 
P. bicinctwm varies in the extent of the light markings 
on the elytra, according to the predominance of the 
light or of the dark colour; the anterior fascia does not 
reach the base, but it sometimes extends to the lateral 
margin. Found under bark of a dead Acacia (Walker). 
Platydema deplanatum, n. sp. 
Oblong-oval, narrow, very depressed, black, shining, the labrum and 
antenne ferruginous, the legs rufo-testaceous. Head closely, finely 
punctate, the eyes moderately large, deeply emarginate ; antenne 
asin P. bicinctum ; prothorax convex, twice as broad as long, widest a 
little behind the middle, not much broader at the base than at the 
apex, the sides rounded and rather sharply margined, the base 
bisinuate, the apex (viewed from above) subtruncate, the hind 
angles rather obtuse, the basal fovez distinct, the surface closely 
and somewhat coarsely punctured, the punctures a little more 
scattered on the middle of the dise ; elytra about three and a half 
times as long as, and slightly wider than, the prothorax, subparallel 
in their basal half, rather coarsely punctate-striate, the punctures 
closely packed and deep, the interstices almost flat, each with an 
irregular row of fine punctures; legs slender. Length 3, 
breadth 14 mm. 
Hab. N.W. Australia—Adelaide River. 
One specimen, found under bark. Allied to P. bicinc- 
twm, but less elongate, the punctuation of the upper 
surface much coarser, the elytral interstices each with a 
single row of punctures only, the thorax more rounded 
at the sides behind, and with more obtuse hind angles, 
the upper surface shining black. 
