140 ON THE GOLIATHIDEOUS CETONIIDA 
above. It is an interesting species, differing in the form of its clypeus from any of the other 
similarly coloured species. Its general habit is similar to that of H. confusa, except that it is 
much more attenuated behind. The front of the head is slightly produced and elevated in the 
middle, and the centre of the disc is elevated into a small tubercle, rounded in front (fig. 3 @ 
3 6), with various curved impressed strigew. The fore tibie are narrow and sub-bidentate 
(fig. 3d), and the mesosternal process is porrected and bent upwards at the tip (fig. 3c). It 
is shining black, with the sides of the pronotum red, dilated towards the hind angles into a 
large patch on each side; the scutellum is red, the podex dirty red; the exposed parts of the 
metacoxe and the deflexed sides of the pronotum red ; the terminal ventral segment and the 
sides of the preceding joint are also red; the large yellow patch on each eiytron terminates 
about one third from their extremity. It inhabits Bengal, and was received by the British Museum 
with the remainder of the Hardwicke bequest. 
Seecies XIX.—Heterorhina bicornis (Plate 36,.fig. 8 a—8 h, and details). 
Cétoine 4 deux cornes, Latr. in Regne An. pl. 17, fig. 4 $; plate 18, fig. 5 O. 
Dicheros plagiatus, Klug MSS.; Gory and Perchéron Mon. Cét. pl. 58, fig. 3. 
It will be seen on referring to Mr. MacLeay’s distribution of the sections of his group 
Coryphe, that he adopted Gory and Perchéron’s Dicheros (which he correctly alters to 
Diceros), as one of them ; observing, however ‘‘ that, except a slight difference in the form of 
the thorax and the colour, we find little to distinguish the group from the section Nariciz. 
The organs of the mouth are the same in both.” Had Mr. MacLeay been acquainted with 
the insects figured in the upper part of my plate 36, there can be no doubt that he would have 
seen the impropriety of retaining Diceros in the station he has assigned it. It is true that we 
now know several species which agree in the peculiar armature of the head of the two sexes ; 
but this character has I think, been satisfactorily shown to be but of trivial value. Compare 
on the other hand, for example, the two insects represented in figures 2 and 7 of this plate, 
and it will be evident that the general relations of the two species are far too close to allow 
them to be separated in consequence of the difference in the structure of the horns of the head 
—a character which, if employed, would necessitate the establishment of almost as many groups 
as there are species in the genus. 
The male has the sides of the head in front of the eyes produced into two long porrected 
horns directed slightly upwards (fig. 8 a, 8 6), the space between them at the base being deeply 
excavated into a semicircular hollow, the crown of the head not being furnished with any horn, 
plate, or tubercle ; the female, on the other hand, has the front of the head conical, reflexed, 
and terminated by two small teeth, the space between which and the crown of the head is 
deeply excavated, a short, flattened, conical horn overhanging the excavation (fig. 8c, 8d). 
The maxille in both sexes are alike, having both the lobes acute, curved, pointed, and entire 
(fig. 8e) ; the mentum is rather broad, with the front margin emarginate (fig. 8 f). The 
prothorax is broader in proportion than in the preceding species similarly coloured, and its sides 
are rather more rounded; we still, however, perceive the slight angle in the middle of each 
side ; the elytra are more attenuated behind, especially in the female; the tips are slightly, 
but not pointedly, produced in either sex. The fore tibize are narrow, and very slightly sub- 
bidentate at the tip in the males (fig. 8 g), but in the female they are rather broader, with 
the tip more distinctly bidentate (fig. 8). The mesosternal process is elongate and bent 
upwards at the tip. The abdomen of the male is deeply impressed down the middle on the 
underside ; the four hind tibis are simple. This species is a native of Timor. 
Species XX.—Heterorhina ornata (Plate 36, figs. 6 and 7, and details). 
Dicheros ornatus, Burm. MSS.; Hope in Proceed. Ent. Soc., July 1841, p. 33. 
The female of this species closely agrees with that of the preceding, but it is of a narrower 
form ; the head is similar (fig. 7 a 7 6), the middle of the crown being furnished with a short, 
flattened, conical horn; it has, however, been described ‘‘ capite medio excavato postice triden- 
tato ;’’ the latter character having originated by regarding the raised and slightly angulated 
lateral margins of the head, in front of the eyes, at the base of the antenne, as horns. The 
yellow spots on the elytra commence nearer the base than the extremity of the scutellum, and 
terminate at one-third of their length from the tip. The terminal segment of the body, both 
above and beneath, as well as the preceding ventral joint, are of a dark-red colour; the 
maxillx are similar to those,of the male of the preceding species. The fore tibie are bidentate 
(fig. 7 c), and the four hind tibize are simple. The mesosternal process (fig. 7¢, 7 d) is por- 
rected, and bent upwards at the tip. 
Mr. Hope’s unique specimen is from Mysore in the East Indies. 
I refer to this species, a male insect, brought by Mr. Cuming from the Philippine Islands, 
