622 Mr. Blackwall's Descriptions of new Species of Spiders. 



mulse, being of a brown colour. Sexual organs dark red-brown. Plates 

 of the spiracles whitish. 



The male is rather smaller than the female, which it resembles in colour. 

 In both sexes the relative length of the legs is the same, but their abso- 

 lute length is greater in the male, a posterior one measuring ^th of an 

 inch. Third and fourth joints of the palpi short : there is a slender, 

 curved process on the outer side of the upper part of the former ; another, 

 longer, slenderer at its extremity, and more curved, projecting from a 

 prominence or apophysis at the outer side of the lower extremity of the 

 latter ; fifth joint oval, convex and hairy externally, concave within, com- 

 prising the palpal organs, v/hich are moderately developed, not very com- 

 plicated in structure, prominent at the upper part, nearly encircled by a 

 fine, black spine, and are of a pale red-brown colour. 



Agelena prompta occurs under stones in the woods near Llanrwst in Den- 

 bighshire. The male has the palpal organs fully developed in October. 



10. Agelena montana. Cephalo-thorace mandibulis maxillis labio sterno pedi- 

 bus palpisque brunneis ; abdomine nigricante, obscur^ sed ad latera evj- 

 dentiiis flavescenti-brunneo maculato. 



Length of the female, not including the spinners, -jifth of an inch ; lengpth of 

 cephalo-thorax -^; breadth ^; breadth of abdomen -^^^ ; length of a 

 posterior leg ^ ; length of a leg of the third pair -^. 



Anterior part of the cephalo-thorax slightly compressed ; sides depressed, 

 marked with furrows diverging from the upper part to the margins ; in 

 the medial line of the posterior region there is a narrow indentation. 

 Mandibles strong, conical, and inclined towards the sternum, which is 

 heart-shaped. Maxillae short, gibbous at the base, round at the extre- 

 mity, and inclined towards the lip, which is nearly semicircular. These 

 parts are brown, the lip being much the darkest. Legs and palpi brown, 

 the joints being the palest. Posterior pair of legs the longest, then the 

 first, which a little exceeds the second in length, third pair the shortest. 

 Tarsi terminated by three claws ; the two superior ones are curved and 

 pectinated, and the inferior one is inflected near its base. The palpi have 



