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Show 860 MONS. E. SIMON ON THE SPIDERS OF ST. VINCENT. [Nov. 16, the ubiquitous Mus rattus. The rats normally inhabiting ships are not, as is commonly supposed, Mus decumanus, but Mus rattus, and in most cases are of the grey variety of that animal, with white belly, though the black form may often be caught in the same ship as the grey. For instance, M r . F. O. P. Cambridge caught two rats on board the Siemens cable-ship up the Amazons, one of which is nearly a typical Mus rattus, while the other almost exactly matches the specimens sent over by M r . Waite as Mus arborlcola. The habits of the latter, as here recorded, are in agreement with this supposition, for all the world over Mus rattus takes to roofs' and trees on meeting its formidable rival Mus decumanus, to which it leaves the gutters and cellars. This relative distribution of the two species has been frequently noticed in the East-end of London, near the Docks, where ship-rats are particularly common. The fact that M r . Waite knows of the occurrence of " Mus arborlcola " only in and close to a large seaport town like Sydney is also, of course, confirmatory of the above opinion.-O. T.] 4. On the Spiders of the Island of St. Vincent.-Part III.2 By E. SIMON3. [Received August 20, 1897.] Ordo ABANEJE. Familia THERIDIIDAE. ARGYRODEAE. ARGYRODES CANCELLATUS Hentz. BHOMPHAEA (ARIAMNES) PAR AD ox A Taczanowski. ARIAMNES LONGISSIMUS Keyserling. EPISINE^E. JANULUS ERYTHROPHTHALMUS E. Sim., P. Z. S. 1894, p. 525. EPISINOPSIS SIMPLICIFRONS, sp. nov. 2 . Long. 3 mm.-Cephalothorax nigricans, subtlllter corlaceus et opacus, vix distincte rufulo-variegatus. Oculi antlcl in llneam levlterprocurvam, meclll majores convexl, Inter se dlstantes sed a lateralibus contlgul. Oculi postlcl cequl, sat magni, in llneam valde recurvam, Inter se fere cequldlstantes, spatlls Inter-ocularibus oculls haud latiorlbus. Area medlorum subparallela, paulo longior quarn latlor, pone oculos anticos levlter convexa 1 Cf. Mus " tectorum," Savi. 2 For Part I., see P. Z. S. 1891, p. 549; for Part IL, P. Z. S. 1894, p. 519. 3 Communicated by Dr. D. SHARP, F.R.S., F.Z.S., on behalf of the Committee for Investigating the Fatma and Flora oi the West-Indian Islands. |