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Show 1892.] ARACHNIDA F R O M ALGERIA A N D TUNISIA. 25 that they throw upon the synonymy of old-established but little-known species. The only circumstance to be noticed here with respect to the Arachnida is the vast amount of variation shown by the sexes and young of the Scorpion, Prionurus australis. ARACHNIDA. The only species of this group obtained by Dr. Anderson are the following: - Galeodes olivieri, Simon, Prionurus australis (Linn.), Buthus europceus (Linn.), and Buthus leptochelys (Ehrb.). All of them are well-known N.-African forms, but I am not aware that B. leptochelys has been ere this recorded so far to the West. The species were obtained at the following localities :-Galeodes olivieri between Biskra and Tuggurt ; Prionurus australis, Duirat, Biskra, Tuggurt; Buthus europceus, Algiers, Hammam Meskoutine, Hammam R'irha; Buthus leptochelys, Biskra. CHILOPODA. Fam. SCUTIGERID^E. SCUTIGERA COLEOPTRATA (Linn.). Hammam R'irha and Algiers. Common in Madeira and in the southern parts of Europe. Fam. LiTHOBiiDiE. LITHOBIUS IMPRESSUS, C. Koch. Kherrata, Constantine, Tunis, Hammam R'irha, Algiers. Originally described from Algeria, but abundant in many parts of Italy. LITHOBIUS CASTANEUS, Newport. Algiers, Hammam Meskoutine, Hammam R'irha, Kherrata, Constantine. This species was redescribed as eximius by Meinert; see Pocock, Ann. Mus. Genov. (2) ix. p. 63, 1890. It occurs also in S. Europe. Fam. SCOLOPENDRID^E. SCOLOPENDRA MORSITANS, Linn. The North-African form of the cosmopolitan S. morsitans was described by Koch as £. scopoliana and by Newport as 5. algerina. For the synonymy of S. scopoliana see Pocock, Ann. Mag. Nat. Hist. ser. 6, vii. pp. 51, 52. SCOLOPENDRA ORANIENSIS, Lucas. S. oraniensis, Lucas, Rev. Zool. 1846, p. 237; id. Expl. Sci. de l'Alg., Anim. Art. p. 344. S. dalmatica, C. Koch, 1847, and other authors. Hammam R'irha, Tunis. At these localities Dr. Anderson obtained three examples of |