168 Mr. C. J. Gahan’s notes on the 
recte truncatis, utrisque bispinosis ; antennis maris quam corpore 
paullo longioribus, articulis 30, 4oque apice leviter nodosis, articulo 
30 quam 4o fere duplo-, quam lo distincte-longiori. Long. 21, 
lat. 6 mm. 
Hab. Roebuck Bay, West Australia (Walker). One 
male example. 
This species somewhat resembles P. sericus, Newm., but pos- 
sesses characters that will enable it to be readily distinguished. 
The third and fourth joints of the male antenne are only slightly 
nodose at the apex, scarcely more so, in fact, than in the females 
of sericus; the third joint is distinctly longer than the first, the 
second and third taken together are about twice the length of the 
fourth joint. The eyes are more approximate both above and 
below than in P. sericus. The under side of the head, though 
having the same number of transverse grooves as in sericus, pre- 
sents a somewhat different appearance; the second groove (the 
one running between the eyes) is less clearly marked, and is 
separated from the post-ocular constriction or groove by a rather 
wide and somewhat punctate interval; the very narrow interval 
between the two anterior grooves is in the form of a sharp trans- 
verse ridge, the only sharp ridge that is to be seen crossing the 
under side of the head. (In P. sericus the interval between the 
second groove and the post-ocular constriction is much narrower, 
and frequently forms as sharp a ridge as that between the first and 
second grooves.) The prothorax is intricately and not strongly 
rugose above, with a median smooth space a little in front of the 
base ; the sides are each furnished with two obtuse and very feeble 
tubercles. The apices of the elytra are transversely truncate, dis- 
tinctly spined at each of the angles, with the outer spines some- 
what stronger than those at the suture. This species approaches 
P. intermedius, Gahan, and P. nubilus, Pasce., in the relative pro- 
portions of the basal joints of the male antenne ; but its antenne 
as a whole are much shorter, and do not surpass the apex of the 
elytra by more than about the last joint. It may be distinguished 
further by the feebler and more intricate wrinkling of the pro- 
thorax, which gives to the latter a somewhat rugose-punctate 
appearance. 
5. Pachydissus nubilus, Pasc.? 
Cerambyx nubilus, Pase., Trans. Ent. Soc. Lond., 
ser. 8, vol.1., p. 558. 
One female example was taken by Mr. Walker at 
Adelaide River in North Australia, 
