Genera and Species of Araneidea. 173 



Mutusca mammosa, n. sp. Plate XVII. fig. 2. 



Adult male, length 2^ lines. 



The cephalothorax has the normal grooves and indentations 

 pretty strongly marked ; and the junction of the cephalic and 

 thoracic segments is indicated by a strong and deep indenta- 

 tion or fovea ; its colour is a dark yellow-brown, and its 

 surface is glossy : the height of the clypeus, which projects 

 considerably, is rather less than half that of the facial space. 



The eyes are in the form of two thirds of a circle, the de- 

 ficient portion being in front ; across and within the deficiency 

 are the two largest of the eight, in a transverse line ; these 

 are round, dark-coloured, and are separated from each other 

 by less than half of an eye's diameter : the rest do not differ 

 greatly in size ; they are, however, of irregular form and 

 pearly white ; those of the hinder pair are oval, the others 

 somewhat bluntly subangular ; none of the six forming the 

 circumference of the circle are contiguous to each other ; the 

 interval is least between those of the lateral pairs respectively : 

 taking the eight eyes as forming two curved rows, those 

 forming the hinder row are equally separated from each other ; 

 each fore central eye is very nearly but not. quite contiguous 

 to the fore lateral nearest to it. 



The legs, judging from the basal joints (which were all that 

 remained), are strong, and rather lighter in colour than the 

 cephalothorax, and their relative length probably 4, 1 (or 

 1,4), 2, 3. 



The palpi are moderately long, strong, and of a light yellow- 

 brown colour: the cubital joint is short, bent, and clavate : 

 the radial is longer, slightly bent, and has its upperside 

 towards the fore extremity produced into a strongish, taper- 

 ing, slightly bent-downwards, pointed apophysis ; underneath 

 this joint, towards the outer side, is a group of strongish 

 hairs ; there are a few hairs on other parts of the palpi, and 

 a single short, curved spine, directed forwards, near the fore 

 extremity of the humeral joints : the digital joint is long and 

 strong, longer than the radial and cubital joints together, of 

 an oval form, drawn out at its fore extremity, like those of 

 spiders of the genera Agelena and Tegenaria. The palpal 

 organs are prominent and well developed, but not very com- 

 plex ; they consist of a principal, large, roundish, corneous 

 lobe, rather broken up at its fore part (where there is a small 

 independent corneous projection) and on the outer side. 



The falces are small, projecting, and cut away towards their 

 inner extremities ; their length is just about equal to that of 

 the height of the facial space ; and their colour is light yellow- 

 ish brown. 



