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MR. HENRY WALTER BATES ON PHASMIDE. 341 
This fine species resembles greatly Phibalosoma phyllocephalum (Westw. Cat. Phasm. 
plate xxxiii. fig. 1), differing in its unarmed body and in the shape of the vaginal oper- 
culum. There is one example only, without locality. 
PHIBALOSOMA MAXIMUM, n.sp. Ph. longissimum, cylindricum, corpore levi, abdominis 
segmento ventrali sexto apice longe bidentato, segmento dorsali apicali valde sinuato ; 
pedibus spinosis (fem.)—Long. corp. 10"; mesothor. 2" 3"; metath. 1" 7"; abdom. 
5" 6", 
Closely allied to Phibalosoma acanthopus, Burm., but differing in the sinuation of the 
tip of the apical dorsal segment, and the existence of two tooth-shaped processes at the 
apex of the sixth ventral segment instead of a simple spine. 
Head oblong, smooth, crown oblique, the oceiput projecting behind in a conical but 
obtuse elevation. Antennæ slender and elongated. Thorax and abdomen cylindrical, 
smooth ; the apex of the sixth ventral segment armed with two rather long tooth-shaped 
corneous processes, placed close together ; the terminal dorsal segment deeply and widely 
notched. The seventh dorsal segment is a little shorter than the sixth, and more than 
twice the length of the eighth and ninth taken together. The vaginal operculum is 
boat-shaped and keeled, with its tip rounded, and reaching the apex of the last dorsal 
segment, the membrane between the operculum and the apical dorsal segment has two 
corneous appendages, one of them greatly elongated, narrow, and curved, the other short 
and broad. The anal styles are short, straight, and pointed. The fore legs are moderately 
long (7" 2"), the femora being serrated along their upper and lower edges, and the tibiæ 
faintly denticulated ; the middle femora are strongly denticulated, with a large foliaceous 
spine on their upper edge towards the base, the middle and posterior tibiæ (also 
denticulated) have a similar flattened spine in the middle of their upper edges, whilst 
the hind femora are simply denticulated. The basal joint of all the tarsi is greatly 
elongated, with the upper edge raised, compressed, and foliaceous at the tip. 
Hab. Taken in Sumatra by Mr. Wallace. It is probable that this may be the female of Ph. serratipes, 
Gray. 
PHIBALOSOMA CALAMETUM. Fem. Cylindricum, glabrum; capite fusco, lateribus albo 
late vittatis, subquadrato, postice subsinuato-att to, inter oculos spinis duabus bre- 
vibus approximatis, occipite bitubereulato; oculis valde prominentibus ; thorace abdo- 
mineque inermibus ; operculo elongatissimo, lineari, supra concavo, apice truncato ; 
stylis brevibus, acutis; pedibus validis, femoribus et tibiis acanthophyllis, tarsis 
antieis articulis tribus apice extrorsum lobatis.— Long. corp. 7" 3" -- operculo 1"= 
8" 3": anten. 4"; mesothor. 1" 7"; metath. 1" 3"; ped. antic. 4" 4"; ped. post. 
4' 25 
Distinct in the shape of the head from the allied species, this member being cuboidal 
in shape, narrowed behind the eyes, and slightly widened again at the posterior angles, 
Which are obtuse; the eyes are very prominent, and there are two acute tubercles lying 
between the eyes and nearer together than frontal spines generally are in this family ; 
there are, besides, two rounded tubercles above the slope of the occiput; the sides have 
