116 REV. O. P. CAMBRIDGE ON SOME NEW [Jail. 21, 



ences I should have determined it, without hesitation, from its 

 exceedingly similar general character and appearance, to have been 

 identical with that remarkable genus. 



Taking, then, the general characters of the two as very nearly 

 similar, the distinctions between Otiothops (as described and figured 

 by Macleay) and Pachypus are as follows : — 



The legs of the first pair consist of the normal number (7) of 

 joints, instead of 6, as in Otiothops ; and these are furnished with 

 terminal tarsal claws, whereas in Otiothops there are none on the legs 

 of the first pair. The tarsal claws (of all the legs) are three, whereas 

 those of Otiothops, on the legs of the three hinder pairs, are but two. 



The spinners are two in number, while in Otiothops Macleay 

 states them to be six. 



The above differences show a nearer approach in some respects to 

 Palpimanus (Duf.) than even to Otiothops ; but although remark- 

 ably similar in colour, appearance, the form of the legs, and number 

 of spinners, to Palpimanus, the position of the eyes is so strikingly 

 dissimilar, as to make it impossible to include them in the same genus. 



Pachypus macleayi, sp. n. (Plate XII. fig. 2.) 



Male adult, length 2 lines. 



The cephalothorax is oval and has a smooth surface destitute of 

 hairs, and almost equally convex on all parts of the upperside except 

 behind, where it is a little higher (when looked at in profile) than 

 in front ; and the hind slope is rather abrupt ; the normal furrows and 

 indentations are obsolete, except a central longitudinal indentation 

 on the hinder slope, indicating the thoracic junction ; its colour is a 

 deep but clear and bright red-brown ; the surface smooth and desti- 

 tute of hairs ; and the height of the clypeus is nearly about half 

 that of the facial space. 



The eyes are unequal in size, and in four pairs or two transverse 

 rows equal in their lengths and curves, which are directed from 

 each other ; those of the two central pairs form very nearly a square, 

 the hind centrals being very small, and the fore centrals large, by 

 far the largest of the eight ; the former are considerably separated 

 from each other, while the latter are nearly contiguous one to the 

 other ; those of each lateral pair are also contiguous to each other, 

 and seated on a slight tubercle. 



The legs are moderate in length — their relative length being 1, 

 4, 2, 3 ; and their colour is rather paler than that of the cephalo- 

 thorax ; those of the first pair have the basal (first) and third joiuts 

 of remarkable strength ; the point of junction between the second 

 and third joints is of ordinary size, but the latter immediately thence 

 enlarges above in an excessively protuberant form ; a similar character 

 is discernible in the corresponding portion of all the legs, but in a 

 much less highly developed way. The genual joints (especially of the 

 first pair) are long and enlarge gradually to their fore extremities ; 

 in the first pair of legs this joint slightly exceeds the tibial joint in 

 length, and is also stronger. The metatarsus is but half the length 

 of the tibia, while the tarsus is nearly double its length and clavate 



