1882.] REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. 439 



Family SalticidjE. 

 Mago, g. n. 



Cephalothorax as high behind as it is long ; the posterior slope 

 curved inwards, but almost perpendicular ; profile of upperside of 

 caput slightly convex, and sloping a little forwards. Tiie capvit is 

 exceedingly large, absorbing, in fact, almost the whole cephalo- 

 thorax ; looked at from above, its upper surface forms nearly a 

 square ; the sides also are perpendicular. Height of clypeus less 

 than the diameter of the fore central eyes. 



Ocular area slightly broader than long and equ.il in breadth before 

 and behind ; fore central pair of eyes very large, and of a dull pearl- 

 grey hue ; fore laterals in a line with base of fore centrals, and of 

 same colour ; posterior pair a little smaller than fore laterals, and as 

 nearly as possible equally divided from them by the minute inter- 

 mediate eye, which is placed a little inside of their straight line. 



Legs moderately long, tolerably strong, 1, 3, 2, 4 ; first pair much 

 the strongest. Armed with spines, and with a small claw-tuft be- 

 neath the terminal tarsal claws. 



Falces long, straight, divergent, and directed forwards ; denticu- 

 lations small ; fang of moderate length and strength. 



Maxilla long, strong, straight, widened on both sides at the extre- 

 mities, which are rounded. 



Labium long, about two thirds the length of the maxillce, and 

 narrower at apex than base ; apex rounded. The direction of the 

 maxillae and labium is very nearly perpendicular (or at right angles) 

 to the sternu7n, which is small, nearly round, slightly pointed behind, 

 and truncated in front ; the truncation is very gently curved, the 

 convexity of the curve directed backwards. 



Abdomen small, short-oval, very convex before, and fitting up 

 pretty closely to the incurved thorax. 



This new genus is characterized with great diffidence, and chiefly 

 on account of the form of the cephalothorax, of which the figures 

 (Plate XXXI.) give a fair representation. There is very little diffi- 

 culty in determining a Spider to be of this family; but to which of the 

 now numerous genera it may belong is often a very difficult point 

 to decide. It is a very questionable addition to our knowledge of this 

 group (which now numbers nearly 1500 species) to establish, as is 

 now constantly being done, new genera often most closely allied, 

 without giving a single figure either of the Spider or its generic 

 characters. No description, however minute and laboured, can pos- 

 sibly, in such cases, compensate for an absence of figures. The eye 

 takes in at a glance distinctive ideas of relative form and proportions 

 from figures, when even the most careful description by itselt would 

 fail to give a clear conception of them. 



Mago intenta, sp. n. (Plate XXXI. fig. 14.) 



Adult male, length 2^ lines. 



The cephalothorax is deep red-brown behind and on the sides, and 

 strongly suffused with blackish on the upperside of the caput (or 

 Proc. Zool. Soc— 1882, No. XXX. 30 



