730 MR. F. 0, PICKARD CAMBRIDGE ON [June 16, 
their tubes, six or eight inches long, silk-lined, with hinged doors 
at the entrance, in the sides of a large termite mound, whose 
damp walls afforded exactly the locality needed for such nests. 
No males were taken. 
The following species have been described which probably belong 
to the same genus :— 
Actinopus tarsalis, Perty, Del. Anim. Art. 1833, p. 39, fig. 6. 
Brazil. 
A, rufipes (Lucas), 2 (sub Pachyloscelis), Ann. Soc. Ent. Fr. 
1833, p. 361. Brazil. 
A, scalops (Sim.), 9, ceph. 10 mm. long. (sub Pachyloscelis), 
Ann. Soc. Ent. Fr. 1889, p. 176. Venezuela. 
A. cardiba (Sim.), 2, ceph. 9°5 mm. long., Ann. Soc. Ent. Fr. 
1889, p. 175. Caraceas; Venezuela. 
A, valencianus (Sim.), 2 , ceph. 5°3 mm. long. (pullus), Ann. Soe. 
Ent. Fr. 1889, p. 177. Valencia, Venezuela. 
A, rojasi (Sim.), 2, ceph. 7 mm. long. (non plane adulta), Ann. 
Soc. Ent. Fr. 1889, p. 176. Caraccas; Venezuela. 
A. longipalpis, C. K., 3, Die Arachniden, ix. p. 102, pl. ccexxiv. 
fig. 754. Montevideo. (Type in coll. Mus. Berlin.) 
A. nattereri, Auss., 2 (Doleschall in MS.), Verhandlungen &c. 
1871, p. 139. Rio Negro. 
A. liodon, Auss., § , Verhandlungen &c. 1875, p.142. Uruguay. 
(Type in coll. Brit. Mus. Nat. Hist.) 
A, crassipes (Keys.), 2, Spinnen Amer. iii. p. 3, pl. i. fig. 1. 
Taguara, Rio Grande do Sul. (Type in coll. Brit. Mus. Nat. Hist.) 
A, luteipes (Keys.), 2 (immature), Spinnen Amer. ili. p. 5. Rio 
Janeiro. (Type in coll. Brit. Mus. Nat. Hist.) 
A. insignis, Holmberg, Ann. Soc. Argent. xi. p. 171, 1886. 
Argentine Republic. 
A. piceus, Auss.,d, Verhandlungen &c. 1871, p.1389. Locality 
unknown. 
A, hartii, Poc., 2, Ann. Mag. Nat. Hist. ser. 6, vol. xvi., Aug. 
1895. Trinidad. (Type in coll. Brit. Mus. Nat. Hist.) 
The following table may be of some assistance in distinguishing 
the females of the seven species of which we have adequate 
descriptions or type specimens. 
The value of the characters, however, especially those drawn 
from the eyes, entirely depends upon the number of specimens 
compared before the character fixed upon was set down, and for 
this of course I cannot be responsible. 
Out of thirteen examples of A. wallacei (2) in all stages of 
development, I find that the central posterior eyes are sometimes 
smaller, sometimes equal to, and sometimes larger than, the 
posterior laterals. Sometimes these are almost in contact with 
one another, sometimes two diameters apart. In the immature 
especially, the posterior centrals are closer to, and smaller than, 
the laterals. Amongst the adults, in the majority, but not in 
all, the axis of the central posteriors is longer than the diameter 
