50 ILLUSTRATIONS OF TWO SPECIES OF SPECTRE INSECTS. 
The large, oval, posteriorly truncate, and very gibbose mesonotum 
measures = of an inch in length, and has the sides armed with a 
row of obtuse spines, which become obliterated towards the hind 
part ; within this row there are also a few much smaller spines, 
forming a parallel series, towards the front part; the centre of the 
elevated part is armed with about a dozen raised tubercles, and there 
are also two smaller ones on the dise towards the fore margin ; the 
underside of the mesothorax is armed with a double row of these 
tubercles ; the metathorax is nearly square, of equal breadth with 
the hind part of the mesothorax; and the five basal segments of the 
abdomen are dilated into an elongate oval form, the middle portion 
of each being convex, but the sides forming a very thin margin, 
along which run five slender, longitudinal ribs, which I presume to 
be veins. The seventh segment beneath is formed into a boat- 
shaped appendage, extending beyond the ninth dorsal plate, longi- 
tudinally carinated, and divided by a slit into two parts, for a 
considerable distance along its apical half. The ninth dorsal 
segment is furnished at each side with a small conical appendage, and 
within the boat-shaped plate are enclosed two long and slender, 
flattened setze, extending as far as the tip of the keel. The feet 
are all quite simple, and destitute of teeth or spines, and are 
comparatively slender. The general colour is pale green, but the 
head and pro- and meso-thorax, as well as the feet and anal 
apparatus, are changed to a pale brown. 
Mr. Hope’s unique specimen of this insect is unfortunately 
destitute of any indication of the habitat of the species. It appears 
to be closely allied to Dr. Burmeister’s D. gibbosa, above-mentioned, 
but the marginal spines are confined to the mesothorax, not ex- 
tending along the entire thorax, as described by Burmeister. 
DIAPHERODES (CRANIDIUM) PUMILIO. (Plate 61, fig. 2.) 
D. lutescens (viridis?) capite inermi mesothoracis lateribus sensim dilatatis vix serrulatis, 
disco in carinam mediam valde elevato ; abdomine elongato vix dilatato supra carinato, 
apice acuminato ; pedibus gracilibus simplicibus, alis nullis; 9 
Long. corp. unc. 2. Habitat in Africa tropicali? In Mus. Bristol Philos. Institution. 
The singular, almost semicircularly elevated carina along the 
middle of the mesonotum, at once distinguishes this insect from all 
other Phasmide. It appears to be congeneric with the species 
last above described, although destitute of any lateral dilatation. 
From the development of the sexual apparatus, which is nearly 
similar to that of D. serricollis, I consider the specimen not to 
be in an immature state. 
