158 Mr. A. G. Butler's 
16. G. vaccula. 
G aster acantha vaccula, Thorell, Ofvers. Vetensk. 
Akad. Furhandl. xvi. p. 301, n. 1 (1859, edit. 1860); 
Eug. Resa, Zool. Arachn. 1, p. 12 (1868). 
Sp. ead. ? Sierra Leone (Slierboro Island), Salmon. 
B.M. 
If I have riglitly identified this species, it is allied to 
G. curvisjnna ; the description of the spines on the 
abdomen is so vague in the original diagnosis, the number 
of them even not being mentioned, that it is impossible 
to determine the species with certainty. 
Sub-genus Gasteracantha, Simon. 
17. G. ornata. 
Gasteracantha ornata, Thorell, Ofvers. Vetensk. 
Akad. Forhandl. xvi. p. 302, n. 7 (1859, edit. 
1860); Eug. Resa, Zool. Arachn. p. 16 (1868). 
"CafFraria" (Waldhercj), Thorell. 
Seems allied to G. ensifera ; the central lateral spines 
are, however, directed backwards and upwards. 
18. G. folcicornis, n. sp. PI. IV. fig. 10. 
Female ; length of abdomen 3j lines ; breadth at widest 
part, excluding spines, 6^ lines ; entire length 4 lines ; 
posterior lateral spines about 5\ lines, anterior 1 line ; of 
posterior margin f of a line. 
Cejihalothorax normal ; abdomen transversely suboval, 
with six angles, from which the spines spring ; two on 
anterior lateral margin, short, horizontal, curving slightly 
backwards ; two on posterior lateral margin, about seven 
times as long, robust, strongly curved backwards and 
upwards ; and two, short on posterior margin, horizontal 
and nearly ])arallel. 
Cephalothorax, falces and femora of legs castaneous, 
pilose ; maxill;\?, labium, tibiae, and tarsi of legs and 
sternum pitchy ; abdomen testaceous, with four central 
and twenty marginal impressed red spots ; spines reddish- 
castaneoxis, pilose ; ventral surface brown, spotted with 
ochraceous, testaceous at the margins, with two or three 
impressed red spots ; a black conical projection between 
spinnci'cts and epigyne. 
S. Africa, Rev. Ch. Livingstone. 1 specimen. B.M. 
Seems allied to G. ornata of Thorell. 
19. G. Thorcllii. 
Gasteracantha Thorcllii, Koyscrling, Sitzungsbcr. 
