On Scorpions and Solifugce from tJie Sudan. 217 A broad silvery band taperiiiG: on the caulal peduncle, continued to end of middle caudal rays. No humeral or caudal spots.

XXV. Scorpions and Solifugce colltcted hy Captain S. S. Flower in the Anglo-Egyptian Sudan. By kS. Hiest.

(Published by permission of the Trustees of the British Museum.)

Scorpions.

Buthus citrimis, II. & E.

Loc. Wady Haifa.

Buthus acKtecarinatus, Sim.

Loc. Khartoum and the Senaar Province; in the Britisli Museum collection there are j)resent also examples from Atbara {Dr. S. K. Maloiif), and from Thebes and Ghizeh (6'. S. F.) in Egypt.

Buthus minax, L. Koch.

Loc. Captain Flower collected examples of this species at Khartoum ; the mouth of the Finder River ; Senaar and Koseires. There are also specimens in the British Museum collection from Abyssinia.

Eemarhs.—The male of Buthus * minax differs from that of B. emini., Poc, principally in the structure of the tail, the upper keels of which are very much weaker, the lateral ones being exceedingly weak or absent in segments 2-4 ; moreover, the upper keel of the fittii caudal segment is represented by onl a very short series of granules and the intercarinal spaces of the caudal segments are not nearly so strongly granular as is the case in B. emini. In the male of B. emini, on the other hand, segments 1-4 of the tail are each furnished with ten well-deiiDed granular keels, the upper and lateral keels being quite distinct and composed of separate granules, which show no tendency to fuse with one another ; the tilth caudal segment has a well-marked upper keel, which runs the entire length ol the segment.

[Buthus poJystictus, Poc., is very closely allied to B. minax and B. emiui, and Prof. Kraepelin f believes that it is only * Birula's observations on Buthus minax and its allies (Sitz. Ber. Ak. VViss. cxA'ii. p. 141, 1908) should be consulted, t Zool. Jabrb. (iSyst.) xviii. p. 560 (1903).