6G() I\Ir. Blackwall's Descriptions of new Species of Spiders. 



loped, and very complicated in structiii-e, having on the outer side of the 

 upper part a curved, corneous process, bifurcated at the extremity, an 

 obtuse, glossy prominence lower down, and a long, acute spine directed 

 downwards and outwards ; they are of a dark red-brown colour. Abdo- 

 men oviform, convex above, projecting over the base of the céphalo- 

 thorax ; it is thinly clad with hairs, glossy, and brownish l)lack. Plates 

 of the spiracles dark brown. 

 Adult males of this species were taken in June 1836, on rails at Oakland. 



49. Liiiiijiliici gracilis. Mas nigricans ; mandibulis maxillis pedibus palpisque 

 l>runneis pauiulhm rufo tinctis. 



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

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

 of the third pair nj- 



Anterior part of the cephalo-thorax compressed ; sides marked with furrows 

 diverging from the upper part to the margins; in the medial line of the 

 posterior region there is a large indentation. Manilibles conical, armed 

 with a few teeth on the inner surface, and inclined towards the sternum, 

 which is heart-shaped, convex, glossy, and provided with some scattered 

 hairs. Maxillae strong, enlarged at the base, where the palpi are inserted, 

 and slightly inclined towards the lip, which is semicircular and prominent 

 at the extremity. The cephalo-thorax, sternum, and lip are brownish 

 black, and the mandibles and maxilke brown, faintly tinged with red. 

 The posterior eyes of the trapezoid are tiic largest, and the anterior ones 

 much the smallest of the eight. Legs long, slender, and pale brown, 

 tinged with red. The palpi are short, and resemble the legs in colour, 

 with the exception of the terminal joint, wliich is darker ; fourth joint 

 much stronger than the third; fifth oval, convex and hairy externally, 

 concave witliin, comprising the palpal organs, which are prominent, 

 highly developed, complicated in structure, with a small, glossy protu- 

 berance on the outer side of the upper |)ai-t, and a fine spine at the ex- 

 tremity, enveloped in a delicate membrane, and curved into a circular 

 form ; they are of a red-brown colour. The convex sides of the terminal 

 joints are directed towards each other. Abdomen oviform, convex above, 



