1870".] REV. O. P. CAMBRIDGE ON EGYPTIAN SPIDERS. 597 



lateral on its side ; the length of the front row is equal to that formed 

 by any three eyes of the hinder row ; and the four central eyes form 

 a square whose fore side is shortest and its hinder side slightly the 

 longest. 



The logs are yellow, indistinctly annulated and marked with dusky 

 brown, and furnished with long spines as well as with hairs and 

 bristles. 



The palpi are pale yellow, moderately long, and furnished with 

 hairs, bristles, and a few spines. 



The j alces are vertical and strong ; their colour is pale yellow, with 

 a broad brownish band along the middle of their fore side, not 

 reaching, however, to their extremities. 



The maxilla and labium are pale yellow. 



The sternum, which is nearly round and pointed a little behind, is 

 also of a pale yellow colour, but broadly margined on each side with 

 dark blackish brown. 



The abdomen has on the upperside a broad longitudinal dark 

 brown band, as wide as the whole width of the abdomen at its fore 

 extremity, but narrowing gradually to the spinners, near which its 

 margins are a little denticulated ; this band has the normal longitu- 

 dinal macula along the middle of its fore part, indistinctly defined, 

 of a brownish-yellow colour, and pointed at its hinder extremity ; and 

 along either side of this are two or three more or less distinct dull 

 whitish spots ; the central tapering band is well defined on each side 

 by a broad yellowish white marginal band ; the sides are marked 

 more or less with black-brown streaks and spots ; and the underside 

 is dull black-brown, divided by a longitudinal central yellowish bar 

 (which tapers to a point behind), and margined by a bar on each side 

 of a similar colour ; the spinners are short and strong, those of the 

 inferior pair being rather stronger, but equal in length to the 

 superiors. 



Four immature examples of this Spider were found on rushes in. 

 a marsh near Alexandria, and are of very great interest as forming a 

 transition from Dolomedes to Ctenus and yet wanting such decided 

 characters as would include them in either of those genera. The 

 position of the eyes is very like that of Sparassus ; and this, with the 

 strongly laterigrade legs, shows an affinity to the Thomisides ; but 

 from the Spiders of this family they are separated by the presence of 

 three instead of two tarsal claws. The general appearance, from the 

 colours and markings, is exceedingly like that of Dolomedes Jimbriatus 

 (C. Koch) ; but the position of the eyes distinguishes it at a glance 

 from that well-known species. The approximation to Ctenus is seen 

 in the approach of the fore lateral eyes to the hind lateral ones ; by 

 which the front row is strongly curved instead of being straight or 

 nearly straight as in Dolomedes ; from this last genus the near ap- 

 proach together of the two rows also very plainly distinguishes it. 

 From all these, and other considerations as well, it has appeared to 

 me necessary to constitute a new genus for its reception. 



