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Show 730 MR. F. O. PICKARD CAMBRIDGE O N [June 16 their tubes, six or eight inches long, silk-lined, with 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 to the same genus :- Actlnopus tarsalls, Perty, Del. Anim. Art. 1833, p. 39, fig. Brazil. A. rufipes (Lucas), $ (sub Pachyloscells), Ann. Soc. Ent. 1833, p. 361. Brazd. A. scalops (Sim.), 2 > ceph. 10 mm. long, (sub Pachyloscells), Ann. Soc. Ent. Fr. 1889, p. 176. Venezuela. A. cara'iba (Sim.), 2 , ceph. 9-5 mm. long., Ann. Soc. Ent. Pr. 1889, p. 175. Caraccas ; Venezuela. A. valencianus (Sim.), 2 •, ceph. 5-3 mm. long, (pullus), Ann. Ent. Fr. 1889, p. 177. Valencia, Venezuela. A. rojasi (Sim.), 5 , ceph. 7 mm. long, (non plane adulta), Ann. Soc. Ent. Fr. 1889, p. 176. Caraccas; Venezuela. A. longlpalpis, C. K., d", Die Arachniden, ix. p. 102, pl. cccxxiv. fig. 754. Montevideo. (Type in coll. Mus. Berlin.) A. nattererl, Auss., $ (Doleschall in MS.), Verhandlungen &c. 1871, p. 139. Bio Negro. A. llodon, Auss., o* 5 Verhandlungen &c. 1875, p. 142. Uruguay. (Type in coll. Brit. Mus. Nat. Hist.) A. crasslpes (Keys.), 5 , Spinnen Amer. iii. p. 3, pl. i. fig. Taguara, Bio Grande do Sul. (Type in coll. Brit. Mus. Nat. Hist.) A. luteipes (Keys.), 2 (immature), Spinnen Amer. hi. p. 5. Bio Janeiro. (Type in coll. Brit. Mus. Nat. Hist.) A. Insignis, Holmberg, Ann. Soc. Argent, xi. p. 171, 1886. Argentine Bepublic. A. piceus, Auss., 6 , Verhandlungen &c. 1871, p. 139. Locality unknown. A. hartll, 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. Tbe value of the characters, however, especially those drawn from the eyes, entirely depeuds 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 ( $ ) 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 |