668 Mr. J. O. Westwood on the Panssida , 
ultimo articulo longiori, latiori, depresso, truncato, tab. 6. f. 4. 
c, cl, c” (In the figure referred to, which is generally correct, 
there are, however, only two organs thus formed.) “ Maxilla 
(Mandibula Fabr .) brevis, apice cornea, arcuata, subulata, fig. 4. 
a, h.” (although the figure exhibits a pair of organs thus formed, 
which are, in fact, the maxillary palpi). The large size of the 
labial palpi compared with the maxillary, and their general 
structure, are singular characters. In respect to the former 
character they approach Pentaplatarthrus. The Cerapterus 
MacLeaii might indeed be considered as the connecting spe- 
cies between Paussus and Cerapterm ; but, at the same time, 
the flattened thorax and antenme of Platyrliopalus evidently 
exhibits great affinity between that genus and Cerapterus, al- 
though the joints of the palpi are comparatively much larger. 
Svvederus and Donovan were silent as to the number of joints 
in the tarsi ; and I regret not being able to supply the de- 
ficiency, from the circumstance of the only individual which I 
have been enabled to examine being the single specimen in the 
Javanese collection, which I consequently was unable to inves- 
tigate so minutely as I could have wished, as also from the 
basal joints being retracted within the hollowed tip of the tibia ; 
the terminal joint is, however, longer and flattened, and appa- 
rently broader at the base than at the tip. The basal joint of 
the antennae is broad and compressed, with the tip emarginate, 
and the second joint is inserted in the centre of this emargina- 
tion at right angles. The second and following joints are flat, 
broad, and depressed, and exhibit as singular an appearance as 
any antenna with which I am acquainted, and which together 
with the other characters will instantly distinguish this genus 
not only from the rest of the family, but from every other known 
genus. 
In the formation of the underside of the body this genus does 
not 
