14 AUSTRALASIAN ANTARCTIC EXPEDITION. 
from Arrhopalities by having the fourth joint of the antenne simple, without annulations, 
and the distal end of the tibio-tarsus with clubbed hairs. Both genera belong to the 
sub-family Sminthuridine, The genus Sminthurus Latr., as now restricted, has a ventral 
tube with tuberculate walls, and also differs from both the above genera in the structure 
of its antennze and other characters. 
The species of Arrhopalites represented in the Collection appears to be new 
and is described below. 
ARRHOPALITES DAVIDI 2.8. 
(Text-figs. 6-8) 
Lotal length of mature individual 1-4 mm., omitting antenne and spring. 
Greatest breadth (at middle of abdomen) 0:7 mm. 
Head depressed, broadly oval, somewhat flattened dorso-vertrally. 
Antenne with the terminal (fourth) joint longer than the other three taken 
together, the total length being 0-9 mm., of which the fourth joint occupies 0-5 mm. 
Basal segment very short, the second about two-thirds as long as the third. A few 
small scattered hairs of normal structure on these two segments. Fourth segment 
with twelve or thirteen whorls of small hairs placed at equal intervals apart from base 
to apex, and indicating the divisions of this segment into separate annuli; apex 
moderately pointed. In most of the specimens the antenna is strongly bent between 
the third and fourth joints. (Text-fig. 6a.) 
Fig. 6.—Arrhopalites davidi n.sp. 
(a) Antenna (x 104). (b) Group of ocelli ( x 392), 
Ocelli only visible in bleached specimens, eight on each side, arranged as in 
Text-fig. 6b. Seven of the ocelli are of medium to large size, the eighth very small 
and not easy to make out. 
Thorax and abdomen as usual in this family, the prothorax forming a 
short neck, the rest of the thorax and abdomen forming a compact globular body, 
with the segmental divisions more or less obliterated, the two terminal segments much 
smaller, the fifth being of the usual protruding saddle-shaped formation. 
