No. II—SECOND REPORT ON THE ARACHNIDA—THE SCORPIONS, 
PEDIPALPI, AND SUPPLEMENTARY NOTES ON THE OPILIONES 
AND PSEUDOSCORPIONS. 
By 8. Hirst. 
(Text-figures 1—7.) 
(Contributed by permission of the Trustees of the British Museum and communicated by 
Professor J. STANLEY Garpiner, M.A., F.R.S., F.L.S.) 
Read Ist May, 1913. 
THE distribution of the Araneze was considered at some length in my first paper 
on the results of this expedition, and therefore I will content myself in the present report 
with making a few remarks on the other groups of Arachnida. 
The species of scorpions occurring in the Seychelles are three in number, but one of 
them is the cosmopolitan Isometrus maculatus De Geer. One of the two remaining 
species—Lychas brauert Krpln.—is peculiar to these islands and its presence there is of 
considerable interest, for the distribution of the genus to which it belongs is very 
suggestive of the former existence of continuous land between the Oriental region and the 
southern half of the African continent. The genus Lychas has four representatives in 
Africa, two of them being tropical forms and the other two S. African. Another species is 
only known to occur at Round Island, near Mauritius, whilst the genus is well represented 
in the countries from India to Australia. Lastly there is the large black scorpion, Chiro- 
machus ochropus C. L. Koch, which is also found at Round Island and at Zanzibar. 
It is difficult to account for the distribution of this species except by former land 
connections. 
Four species of Pedipalpi inhabit the Seychelles, and three of them are restricted to 
those islands, but these indigenous species are of small size, and our knowledge of the 
groups to which they belong is still very incomplete; it would be useless, therefore, to 
discuss their distribution. The remaining species, Tarantula scaber Gerv., has the same 
distribution as the large black scorpion mentioned above, occurring at Round Island and 
Zanzibar. 
Tt is well known that Pseudoscorpions sometimes attach themselves to insects, and 
this habit must help considerably in the dispersal of these little arachnids. They are most 
often found clinging to the legs of flies, but occasionally also to those of other insects, and 
sometimes they occur under the elytra of beetles*. Several Pseudoscorpions collected on 
vertebrates have been forwarded to the British Museum during the last few years. The 
* A very useful account of the pseudoparasitism of chelifers on other arthropods has been published by 
Mr H. Wallis Kew (Naturalist, 1901, p. 193). 
