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Show 206 MR. O. THOMAS O N S O M E [Mar. 17, A bronzy black stripe, showing slightly greenish in some lights, covers segments 3-6 above (terminal segments wanting). Wings hyaline, with 11 postcubital nervures ; pterostigma pale yellow, very oblique and pointed at the ends, and covering less than one cell. Kandy (August 1888). Allied to Stenobasis occipitalis, Selys, from N e w Guinea; but in A. ceylonica the head is concolorous, and consequently there are no postocular spots, a character which I regard as purely artificial. Archibasis (Stenobasis, Selys) appears to differ from Teinobasis (Telebasis, p., Selys) in the position of the basal post-costal nervure. In Archibasis it is placed about halfway between the level of the two antecubital nervures, whereas in Teinobasis it is placed close to the level of the second. 13. LESTES ELATUS. Lestes elata, Selys, Bull. Acad. Belg. xiii. p. 319 (1862). Pundaloya. 14. LESTES GRACILIS (?). Lestes gracilis, Selys, Bull. Acad. Belg. xxiii. p. 327 (1862). A pair of Lestes in M r . Green's collection from Pundaloya agree fairly well with D e Selys's description of this species, but they present no trace of bluish colouring, and the male has only 9 postcubital nervures on the anterior wings; the female has 12. The genus Lestes is well represented in Ceylon ; and I do not feel justified in describing Mr. Green's specimens as new in the absence of others of the same section from the island. I have passed over two other Dragonflies in Mr. Green's collection, allied to Agrionoptera and Ccenagrion respectively, pending the acquisition of a larger series. EXPLANATION OF PLATE XX. Fig. 1. Orthetrum carnaticum, Fabr., p. 204. 2. Neurobasis apicalis, sp. n., neuration, p. 204. 2 a. , anal appendages. 3. Platysticta yrceni, sp. n., p. 204. 3 a. ( anal appendages. 4. Archibasis ceylonica, sp. n., p. 205, 4. On some Antelopes collected in Somali-land by Mr. T. W . H. Clarke. By OLDFIELD THOMAS. [Received March 17, 1891.] (Plates X X I . & XXII.) By the kindness of Messrs. Rowland Ward & Co., the well-known ' taxidermists of Piccadilly, I have been entrusted with the examination of the fine series of Antelope heads and horns recently collected in Somali-land by Mr. T. W . H . Clarke. These Antelopes prove to |