MR. HENRY WALTER BATES ON PHASMIDÆ. 343 
ment elevated behind, apical segment broad at the tip, its surface separated from the 
sides by raised lines, sloping and tuberculated. Meso- and metasternum tuberculated, 
the sides near the coxæ dilated and obtusely denticulated. Legs short, stout, sulcated ; 
hind femora above with three foliaceous spines. 
Hab. One example, collected by the late M. Mouhot at Chantaboun, Camboja, is in Mr. W. W. Saun- 
ders’s Collection. 
ACANTHODERUS GRAVIDUS, n. sp. 4. minus elongatus, crassiculus, rugosus, abdominis 
dimidio basali dilatato, tumido; cinereo-fusco unicolor ; capite fronte breviter sex- 
spinoso, occipite valde elevato et tubereulato ; antennis brevibus, articulo basali mar- 
gine exteriore bispinoso ; thorace tuberculato ; abdomine ultra partem elevatam valde 
depresso, deinde apicem versus paullo elevato, tuberculato, lateribus tuberculato- 
carinatis, segmentis 4^-8" medio carinato-dentatis (‚fem.).—Long. corp. 1" 114’; 
anten. 8"; cap. 13"; prothor. 2"; mesoth. 5"; metath. 9"; abdom. 1". 
Closely allied to Pachymorpha coronata, De Haan (Acanthoderus id., Westw.), but 
differs in being almost uniformly tuberculated and destitute of the many prominent spines 
on the various parts of the body which P. coronata presents. 
Body somewhat thick and broad, uniform light ashy-brown. Head not broader 
than the prothorax ; forehead (above the antennæ) with six small but acute tubercles 
arranged in two rows converging upwards; behind these the occiput rises obliquely into 
an irregular conical mass studded with obtuse tubercles. The antennæ are short (as in the 
group to which P. coronata belongs), being little more than a third the length of the 
body and somewhat stout ; the basal joint is of thick, irregular shape, but flattened above, 
and having two short teeth on its outer edge. Thorax nearly cylindrical, 10 lines in 
length and 3 in diameter, tuberculated throughout, the tubercles being more obtuse on the 
breast, two or more in the ntiddle of the front and hind margins of the mesothorax and on 
the hind margin of the metathorax being larger than the rest; the keeled sides of the 
breast above the sockets of the legs have a row of small and rather more pointed tubercles. 
Abdomen with keeled lateral margins, the basal half dilated and elevated, the fifth and 
Sixth segments much depressed, the rest rising again slightly to the apex; the lateral 
edges are obtusely denticulated, the surface is tuberculated, the fourth segment is strongly 
elevated in the middle, the elevation forming a double ridge gaping behind ; the fifth to 
seventh segments have each a prominent tubercle in the middle; in the eighth this 
tubercle is expanded into a very prominent ridge ; the apical angles of the segments are 
produced each into a tooth, the apical segment being strongly produced in the middle and 
faintly notched at the tip. Anal styles short, inconspicuous. Vaginal operculum con- 
vex, keeled, with its apical margin flattened out. Legs short, stout, femora of the middle 
and hind legs tuberculated above and beneath; tarsal joints very short; claw-joint about 
as long as all the rest taken together. 
Hab. Island of Gilolo, Moluccas (Wallace). 
ACANTHODERUS SPINIVENTRIS, n. sp. Elongatus, subdepressus, cinereo-fuscus; capite 
oblongo, postice oblique elevato et spinoso, declivitate frontali usque ad basin anten- 
