36 Mr. G. J. Arrow on 
the male apparatus connected with this structure is exceed- 
ingly peculiar—indeed, so extraordinary that, but that the sex 
of the other form of the species is beyond doubt, it would 
have left the determination of the sexes still uncertain. The 
ventral and dorsal aspects of this apparatus are shown at 
ce and d in the accompanying sketch. 
The two sexual forms are easily distinguishable by their 
external appearance, the males being more depressed, with a 
larger head and less convex pronotum, the latter being more 
broadly margined laterally. Three specimens of each sex are 
contained in the British Museum. 
Although Herr Brenske has not investigated the sexual 
characters of the type species, Adorodocia maxima, there can 
be no doubt that it is congeneric with and closely related to 
A. strigata; but whereas the sculpture of the latter is simply 
a coarse puncturation, the former is described as “aciculately” 
punctured. 
Exceedingly like Adorodocia strigata, and for more than 
twenty years undistinguished from it in the British Museum 
collection, is an insect which upon careful examination has 
proved so different from it in its structural details that another 
genus has of necessity to be formed for it. The single 
specimen is a male, and the genitalia (shown by side and 
end view at a and d), although not greatly differing from 
those of Rutelide in general, are so entirely unlike those of 
the other insect as to suggest no affinity at all. Yet, although 
there are various other structural differences, the points of 
resemblance are so many that it is impossible to widely 
separate the two genera. Altogether the problems suggested 
by these strange Madagascan forms are of the utmost interest. 
The following is the generic diagnosis of the new insect :— 
PSEUDADORODOCIA, gen. nov. 
Caput magnum. Clypeus semicircularis. Labrum triangularis, 
apice prolongato. Labium medio emarginatum. Antenne 
10-articulatze, elongatee, articulis tertio et sexto valde elongatis. 
