404 'l-HK REV. O. PICKARD-CAMBRIDGE ON 



central impressions. The sides of the thorax are slightly 

 maxginerl also with blackish. 



The eyes are rather large, and occupy the whole of the fore 

 part of the caput. The four centrals form a large quadrangle 

 rather longer than broad and a little narrower behind. The 

 convexity of the curve of the hinder row is slightly directed back- 

 wards, and the interval between the hind-central pair of eyes is 

 rather greater than that betAveen each and the lateral eye next 

 to it. 



The legs (1, 4, 2, 3) are moderate in length and strength, 

 of a pale yellowish-white hue, with a slight appearance of 

 a dark but defective annulation at the extremities of the joints. 

 They axe furnished with hairs and a few slender bristles only. 



The pcdpi are short, similar to the legs in colour. The digital 

 joint very large, of an oval form ; and the palpal organs, directed 

 outwards, are simple in form but completely encircled on the 

 margin by a long coiled black spine issuing from near the hinder 

 margin, from and in connection with a largish corneous pi^ocess, 

 and ending in a fine somewhat sinuovis slender point underneath 

 the fore extremity of the joint. 



Falces rather small and weak, and directed slightly forwards. 

 Maxillce, labhtm, and stermmi normal, and, with the falces, 

 similar in colour to the cephalothorax. 



The abdomen is large and of a general cretaceous white colour. 

 Its form (looked at from above) is somewhat subtriangulax, and 

 at the shoulders (or each anterior fore corner) is a. slight pro- 

 minent point or gibbosity. An obscure pattern of a dusky hue 

 may be traced on the hinder extremity, and the fore extremity is 

 also similarly suffused. 



Two examples, both males, one adult the other immature, were 

 contained among other Swiss spiders kindly given to me some 

 vears ago by Mons. Eugene Simon. It is most probable that 

 a series of specimens would show a richer colouring, and a more 

 <lefinite pattern than could be traced in these two examples, which 

 had apparently not yet attained their full development in these 

 respects. In genei-al appearance the present species shows some 

 resemblance to Theridion pcdlens Bl., but the decided difference 

 of the thoracic markings, as well as the form of the abdomen, and 

 the details of the palpal organs, will serve to distinguish them 

 without difficulty. 



Description of Tarentula lesseriii, sp. n. (Text-fig. 52.) 



Adult female. Length 6^ lines. 



Of normal general form. The cephalothorax is of a dark 

 brown colour, with a broad central longitudinal straight band of 

 a paler hue, without lateral constriction, and clothed densely 

 with shoi-t hoary hairs ; the normal lateral converging in- 

 dentations are marked by rather darker lines or narrow stripes. 



