No. XVII.— ORTHOPTERA, PHASMID^E OF THE SEYCHELLES. 

 By '"Dr Ignacio Bolivar and Charles Ferriere, B.Sc, JJyiiversity of Geneva. 



(With 2 Text-figures.) 

 (Communicated by Prof. J. Stanley Gardiner, M.A., F.R.S., F.L.S.) 



Read 21st March 1912. 



The Phasmidse brought from the Seychelles by the Percy Sladen Trust Expedition 

 are remarkable firstly by the character of their local distribution within those islands. 

 Out of the 6 species found there, 5 are peculiar to the Seychelles, and only 1 single 

 species [Phyllium hioculatum Gray) is widely distributed. Now Mr Scott informs me 

 that all the specimens of the 5 peculiar species (i.e. the Carausius and Gvceffea) collected 

 by him, and among which are 3 new species, were found in the mountain-forests, most of 

 them in the highest parts, among the endemic forest vegetation : on the other hand no 

 Phyllium was found by him in the forests, but all those in the collection were given by 

 residents or local collectors, who stated that these insects are found in the foliage of 

 guava-bushes {Psidium), and perhaps of some other non-endemic plants in the lower 

 cultivated country. 



If we consider now the wider geographical distribution we see that all the species of 

 Phyllium recorded from the Seychelles are found, outside that country and Mauritius, 

 only in India, Ceylon, and the East Indies ; and that, likewise, the genus Carausius has 

 its centre of distribution in the Malay Archipelago, and extends also into India, Ceylon, 

 the South of China, and Australia ; while the genus Grceffea has been hitherto recorded 

 only from Australia, Celebes, New Guinea, Fiji, Society Islands and other localities in 

 those regions!. 



* The two authors' portions of the work are distinguished by their names being placed in brackets at the 

 end of each of their several sections. The double authorship is explained as follows. A small but interesting 

 series of Phasmidae was collected by the "Sealark" E.xpedition in 1905. This material was worked out by 

 Dr Bolivar, and sent back by him to Cambridge : he found among it a new species (Caratisius gurdineri), the 

 description of which is included in this paper, and also two others (Brst obtained by Alluaud in 1892) which he 

 had previously described in Ann. Soc. Ent. France, xiv. 1895, pp. 369—385. A much larger material was 

 collected in 1908 — 9, and this was studied by M. Ferriere at the Cambridge University Museum in the autumn 

 of 1911. He not only had before him the material determined by Dr Bolivar and the latter's manuscript, but he 

 also visited the Hope Department of the Oxford Museum in order to consult the fine collection of Phasmidie 

 preserved there. In the Seychelles collection of 1908—9, he referred a large number of specimens to the species 

 already determined by Dr Bolivar, but he also described the two new species Carausius scotti and Gra-ffea 

 gc.yehdlensis. M. Ferrifere has incorporated his own and Dr Bolivar's manuscripts into the present paper and 

 written the introduction thereto. I have myself added certain particulars as to localities, habits, itc, and have 

 also, with Dr Bolivar's permission, translated those parts of his manuscript which were written in French. — 

 Hugh Scott. 



t The Indo-Australian affinities of the Seychelles Phasmidse are commented on by Professor Kolbe in the 

 introduction to his paper on "Die Coleopterenfauna der Seychellen," Mitt. Zool. Mus. Berlin, v, 1910, pp. 7 A 8. 



