356 REV. O. p. CAMBRIDGE ON NEW SPIDERS. [Tune 5, 



The whole falces are, however, more massive than in the male, 

 and they are furnished with strong spines above at the extre- 

 mities. The spines also on the legs are stronger, and are found on 

 the metatarsi of the first pair as well as of the last. The palpi 

 are also furnished with strong spines, and the legs themselves are 

 shorter. 



Examples of this most interesting Spider were kindly sent to me 

 by Mr. J. J. Rivers from Berkeley, California, who tells me that it 

 tunnels in banks mostly by streams, forming a tubular projection 

 above ground of any material at hand, woven up with silk, making 

 no trapdoor, but closing the aperture at times. It has a close general 

 resemblance to Atypus ; but the very different form of the maxillae 

 distinguishes it at a glance and necessitates the formation of a new 

 genus for its reception. It is with much pleasure that I connect 

 Mr. Eivers's name with this Spider. 



Drassid^. 



Amatjrobioides, g. n. 



Cephalothorax oblong, its length double its breadth ; the lateral 

 marginal constriction at the caput is slight but perceptible ; the 

 profile forms a continuous curve from the hinder slope to the fore 

 extremity ; normal indentations very slight. 



Eyes of moderate size, placed on slight tubercles on somewhat 

 of a prominence, in two transverse slightly curved rows at the 

 middle of the fore part of the caput close to the margin, and forming 

 a segment of a circle ; the posterior pair is much the longest ; their 

 position is very like that of Clubiona, but they form a less laterally 

 extended area. 



Legs moderate both in length and strength, 1, 4, 2, 3, the dif- 

 ference between 1 and 4 being very slight ; furnished with hairs 

 and spines ; the latter, chiefly beneath the tibise and metatarsi, few 

 and fine ; a not very dense scopula beneath the tarsi and metatarsi ; 

 tarsal claws 2, pectinated, and below them is a claw-tuft. 



Falces long, powerful, prominent at their base in front and 

 strongly arched in profile. 



MaxillcB long, strong, enlarged and divergent at their anterior 

 extremity, where they are rounded on the outer side, but obliquely 

 truncated on the inner side. 



Labium oblong-oval ; more than half the length of the masillse. 



Sternum elongate-oval, pointed behind and truncated in front. 



Abdomen oval and of moderate convexity on the upperside. 

 Spinners comjiact, of uniform length, moderately long and strong ; 

 those of the inferior pair much the strongest. 



Amaurobioides maritima, sp. n. (Plate XXXVI. fig. 3.) 

 Adult female, length rather more than 5 lines. 

 Cephalothorax dark yellow-brown, deepening to red-brown and 

 black on the caput ; clothed thinly with short fine hairs ; the height 



