344 MR. HENRY WALTER BATES ON PHASMIDE. 
narum lateribus spinosis; antennis brevibus, robustis, filiformibus, articulo basali 
extus trispinoso; pronoto quadrato, angulis spinosis, dorso acute tuberculato ; me- 
sonoto depresso, postice paulo ampliato, lateribus acute tuberculatis, dorso verrucoso, 
linea dorsali antice et postice bispinoso; metanoto mesonoto angustiore, qua- 
drato, angulis posticis spinosis ; metasterno lateribus dilatatis, denticulatis, medio 
spina magna; abdomine maris cylindrico, fæminæ pone medium constricto et de. 
presso, supra verrucoso, segmentis 7 anterioribus supra bispinulosis, lateribus den- 
ticulatis et spina magna recta acuta armatis, 2 terminalibus angulatis, penultimo 
supra valide earinato, segmento quinto fœminæ nigro bimaculato ; femoribus omni- 
bus breviter spinosis.— Mas corpore angustiore; long. corp. 1" 8"; capit. 2"; 
prothor. 12"; mesoth. 4i"; metath. 3". Fam. Corpore latiore; long. corp. 2"; 
anten. 9", 21-articulatis; cap. 3"; prothor. 12"; mesoth. 5"; metath. 3j". 
(Pl. XLIV. f. 2a, 25.) 
Closely allied to Acanthoderus coronatus (De Haan), differing chiefly in the greater 
length and more pointed form of the lateral spines of the abdomen, which stand out at 
right angles to the body. Other minor points of difference are the much darker colour of 
A. spiniventris and the more enlarged form of the basal half of the abdomen in the female, 
followed by a greater constriction of the fifth and sixth segments. 
Body of a dark ashy-brown colour; antennæ tawny at the tip. Head obliquely raised 
behind, the raised part armed with 5—7 acute tubercles or spines, and the frontal slope to 
the base of the antenn armed on each side with similar spines, the middle of the fore 
head being tuberculated. Thorax flattened above, the outline widening from the front 
towards the middle of the mesonotum ; surface warty, angles and dorsal line spiny ; me- 
tasternum dilated on the sides and armed with a long straight acute spine. Abdomen of 
the male cylindrical, of the female dilated in its basal half, then greatly constricted, be- 
coming dilated again towards the apex; surface in both sexes rough and warty, with à 
pair of sharp spines near the hind margin of each segment except the two terminal ones, 
the sides of the same denticulated and armed each with a long and very acute spine stand- 
ing out at right angles to the body ; eighth and ninth dorsal segments dilated and angu- 
lated, eighth with a high ridge in the middle, ninth narrowed towards the tip, tip notched. 
Legs stout, thighs armed with a few short spines. 
Male. Body narrower than in the female ; abdomen cylindrical, spotless ; ninth ventral 
segment greatly enlarged and convex, tuberculated on the surface, and dilated on the 
sides. 
Female. Body broad; fifth abdominal segment with two black spots in the middle of the 
base; operculum convex, keeled, tuberculated, reaching nearly the tip of the last 
dorsal segment. 
A pupa of the female sex in Mr. Saunders’s collection differs from the adult stage (be 
sides the undeveloped state of the genital segment of the abdomen) only in the smaller 
size of the tubereles and spines, and in the absence of enlargement of the first four seg | 
ments of the abdomen. 
. Hab. Islands of Timor and Bourou '(Coll. W. W. Saunders, Esq.). Many examples were sent home by - 
Mr. Wallace, and all'agree in the essential features which distinguish the species from A. corona 
