642 Mr. Blackwall's Descriptiojis of neic Species of Spiciei^s. 



developed, complicated in structure, having a bold protuberance near the 

 middle, and a short, fine, curved spine at the extremity ; their colour is 

 dark reddish brown. Abdomen oviform, rather broader at the posterior 

 tlian the anterior extremity, convex above, projecting over the base of the 

 cephalo-thorax ; it is thinly covered with hairs, glossy and brownish black. 

 Plates of the spiracles dull yellow. 

 In March 1837, adult males of this species were found under stones in the 

 woods about Llanrwst. 



Genus NeriËne*, Blackw. 



28. Nericiie munda. Maris cephalo-thorace mandibulis maxillis labio sterno- 

 que rufescenti-brunneis ; pedibus palpisque pallidè rufis ; pedum pari 

 lmo4toque reliquis longioribus œqualibus, 3tio brevissimo ; abdomine 

 nigricante. 



Length of the male ^th of an inch ; length of cephalo-thorax -^ ; breadth -^ ; 

 breadth of abdomen ^ ; length of an anterior leg ^ ; length of a leg of 

 the third pair ^. 



Cephalo-thorax oval, glossy, convex above, with a slight indentation in the 

 medial line of the posterior region. Mandibles strong, conical, vertical, 

 provided with teeth on the inner surface, and a small, conical prominence 

 in front, near the extremity, on the inner side. Maxillœ powerful, greatly 

 enlarged where the palpi are inserted, and inclined towards the lip, which 

 is semicircular and prominent at the extremity. Sternum broad and 

 heart-shaped. These parts are reddish brown, the mandibles and maxillae 

 being the reddest. Legs and palpi pale red, with tlie exception of the 

 terminal joint of the latter, which is reddish brown. First and fourth 

 . pairs of legs, which are the longest, equal in length, third pair the short- 

 est. This spider, like the rest of the genus, has the tarsi terminated by 

 three claws ; the two superior ones curved and pectinated, and the infe- 

 rior one inflected near its base. The intermediate eyes form a trapezoid, 

 the anterior ones of which are the smallest of the eight. Third and fourth 



* For tlie characters of the genus Nerii-ne, see the London and Edinburgli Philosophical Magazine 

 and Journal of Science, vol. iii. p. 187-8 ; and Researches in Zoology, p. 362-3. 



