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Transactions of the Uoyal Society of South Africa. 
for a median stripe. The basal pectinal tooth of the female is enlarged. In 
female specimens belonging to the Transvaal Museum each tergite has a 
smooth and polished area in its anterior half, and sometimes a smooth area 
occurs immediately in front of and at either side of the ocular tubercle. 
However, Thorell says of his specimens, " Haec forma a forma principali vix 
differt nisi trunco et cauda paullo crassius granulosis et carinis lateralibus 
et inferioribus segmenti V etiam magis obsoletis, vix nisi versus apicem 
segmenti serie granulorum indicatis, et tuberculo vesicae sub aculeo in mare 
vix conspicuo." 
I am inclined to think that JJ. marsJialli Pocock (7) is identical with 
this form. In the type male of marshalli the tail is not quite so much 
elongated as in typical triangulifer ; the tergites are granular throughout 
and the carapace has no smooth areas. 
The Natal Museum has a black variety from East Zululand, and there is 
a very dark specimen from Paulpietersburg in the Durban Museum in 
which the tergites are more strongly granulated than in Transvaal examples 
and the basal pectinal tooth of the female is scarcely enlarged. 
A third variety has been described by me (20) under the name of JJ. 
triangulifer var. flavidus (PI. XXI, fig. 25). In this form, the female is 
almost uniformly yellow throughout, the tergites being only slightly infus- 
cated ; the male however is somewhat infuscated. Each tergite of the 
female, except the last, has an extensive smooth and polished area in its 
anterior half ; the sides of the fifth caudal segment are quite smooth above, 
becoming granular below. Basal pectinal tooth of the female not enlarged. 
This form is only known from Kimberley. 
13. U. OLivACEus Pocock (PI. XXI, fig. 24), Ann. Mag. Nat. Hist., 6, 17, 
p. 385, 1896. 
Distribution : The type was from the Murchison Eange, Transvaal. We 
have it from Newington, and the Transvaal Museum has specimens from 
Hectorspruit, Griffin Mine, Leydsdorp, and Clearwaters near Haenertsburg. 
In Pocock' s key this species is said to be distinct from triangulifer in that 
" the inferior caudal crests are weak, nearly obsolete, and lost amongst the 
granules of the lower surface, those on the first segment smooth " whereas 
triangulifer has " all the crests of the tail strong and well defined, those on 
the lower surface of the first segment granular." In these characters the 
two species seem to me practically identical ; the inferior keels of the first 
caudal segment are not smooth in the females of olivaceus. 
14. U. FLAvoviRiDis Peters, Mon. Ak. Wiss. Berlin, 1862, p. 516. 
This species was fully redescribed by Pocock (3) and afterwards (7) 
renamed by him as chlorodermus. Peter's type came from Tette, and after 
comparing male and female specimens from that locality in the British 
