HIRST— ARANE^E, OPILIONES AND PSEUDOSCORPIONES 389 



somewhat produced. Tarsal organ complicated in structure (for further details of the 

 tibia of the palp and of the tarsal organ see Fig. 6 c). 



Measurements in mm. Length of body 14, of carapace 7, breadth of carapace 6, 

 length of first leg (from base of femur) 25 - 5, of second 27, of third 22, of fourth 24 - 25. 



$ . Very similar to the male, but with shorter legs (for the structure of the vulva, 

 see Fig. 6 a). 



Measurements in mm. Length of body 15, of carapace 7*25, breadth of carapace 6'5, 

 length of first leg 22-5, of second 24, of third 20, of fourth 22*5. 



Material. Numerous examples from Mahe" and Silhouette (including an adult male 

 (the type) and several adult females). A few specimens, which probably belong to the same 

 species, were collected on Praslin ; the vulva is slightly different in shape in the only adult 

 example. 



Remarks. This species varies much in size, the carapace of the adult female varying 

 from 4 — 7 "25 mm. in length, yet an immature specimen in the collection has the carapace 

 6 "5 mm. in length. 



Opiliones. 



1. Ibalonius inscriptus, Loman (Fig. 7). 



Material. Numerous examples from Mahe* and Silhouette, and a few from Praslin. 



Remarks. The pattern formed by the dark markings of the scutum is essentially 

 the same in the forms described by Mr Loman under the names /. bimaculatus and 

 /. inscriptus (see Fig. 7). The two large pale-coloured spots which form 

 so conspicuous a feature of the more typical examples of the former are 

 replaced in others by minute and inconspicuous spots or streaks. It is 

 evident therefore that this character cannot be relied upon to distinguish 

 this species from /. inscriptus. There do not seem to be any constant 

 structural characters by which it is possible to separate these two forms 

 from one another, and I think that they should be regarded as belonging 

 to a single species. 



In many of the specimens the scutum is only armed with the five 

 principal spines. In others it is furnished with a number of small addi- $' ■ , a on l Wi 



r r r inscriptus, uo- 



tional processes or tubercles ; a pair of them being situated in the middle '"»n. Dorsal 

 of the posterior part of the cephalothoracic area, and in the middle of each y " 



of the abdominal segments except the last, which has a single median tubercle, besides the 

 large spines. An outer pair of tubercles is also present in these specimens on the second 

 abdominal segment or on both the first and second abdominal segments. Some of the 

 individuals from Mahe in which these additional tubercles are present are very dark in 

 colour and the bands on the legs are scarcely visible, moreover the dorsal surface seems to 

 be more convex in these specimens than is usually the case in /. inscriptus. 



3. Ibalonius Jlavopictus, n. sp. (Fig. 8). 



Colour. Ground-colour of scutum pale yellowish white ; its sides much obscured with 

 SECOND SERIES— ZOOLOGY, VOL. XIV. 50 



