96 Transactions of the Boyal Society of South Africa. 
rounded protuberances, which are ^distributed as follows : — {a) Marginal 
tubercles thirty-four in number, seventeen on each side, the seventeenth or 
posterior pair bearing setae as well as stout spines. These take the place 
of the caudal lobes, {h) A median dorsal series of twelve tubercles- 
extending over the whole dorsum, and not interrupted on the abdominal 
segments. (c) A subdorsal series on each side about midway between 
the median and marginal series, each consisting of 10 tubercles, the 
I. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
VIII. 
IX. 
130 
120 
no 
100 
90 
80 
70 
60 
50 
40 
30 
20 
10 
Ay 
T. insolitus. 
posterior two of the median series not represented, {d) On each of the 
three thoracic segments there are two further tubercles present, one on 
each side between the median and subdorsal series. The marginal series 
are the most prominent, being large, and rounded, and bearing on an 
average 10 very stout conical spines 30 fi long. The number of spines 
varies from 5 to 12 on this series of tubercles, 6 or 7 being the most 
common number at the anterior end and 10 to 12 on the first abdominal 
segments. The other series are generally smaller, and possess fewer 
spines, the median and subdorsal series being most pronounced on the 
thoracic segments where 6 or 7 spines is the usual number. In all other 
cases 3 to 5 spines appear normal. 
The dermis is characterized by (a) small gland-pores, few in number, 
some with subcutaneous tubes and others with bristle-like hairs ; and {b} 
* Although the description of T. insolitus st&tea that " the medium series absent on 
the abdominal segments " the figure I.e. Plate iii., Fig. 10, shows the distribution of 
tubercles exactly as in the South African insect. 
