260 Mr. J. Blackwall on new species of Madeiran Spiders. 



thorax y 1 ^ ; breadth -— ; breadth of the abdomen y 1 ^ ; length of 

 an anterior leg | ; length of a leg of the third pair -£%. 



The eyes are seated on black spots, and are closely grouped 

 on the anterior part of the cephalothorax in two transverse rows ; 

 the four intermediate ones form a square, the two anterior ones, 

 which are placed on a tubercle, being the smallest and darkest 

 of the eight ; the eyes of each lateral pair are seated on a tu- 

 bercle, and are contiguous. The cephalothorax is short, convex, 

 glossy, compressed before, and rounded on the sides, which are 

 marked with slight furrows converging towards a large indenta- 

 tion in the medial line : the falces are slender, conical, and ver- 

 tical : the maxilla? are obliquely truncated at the extremity, on 

 the outer side, and are inclined towards the lip, which is tri- 

 angular but rounded at the apex : the sternum is heart-shaped : 

 the legs are long, slender, and provided with hairs ; the first 

 pair is the longest, then the fourth, and the third pair is the 

 shortest ; each tarsus is terminated by three claws ; the two 

 superior ones are curved and pectinated, and the inferior one is 

 inflected near its base : the palpi have a curved, pectinated claw 

 at their extremity : the abdomen is oviform, thinly clothed with 

 hairs, convex above, and projects over the base of the cephalo- 

 thorax. This spider is entirely of a pale, dull yellowish colour, 

 the falces having a faint tinge of red. 



An immature female of this species was discovered on a piece 

 of wood in a house. 



Genus Latrodectus, Walck. 

 Latrodectus distinctus. 



Length of the female jth of an inch ; length of the cephalo- 

 thorax T \ 2 ; breadth y 1 ^ ; breadth of the abdomen -py ; length of 

 an anterior leg § ; length of a leg of the third pair ^. 



The cephalothorax is oval, convex, particularly in the cephalic 

 region, glossy, with slight furrows on the sides, which converge 

 towards a large indentation in the medial line : the falces are 

 conical and vertical : the maxillse are obliquely truncated at the 

 extremity, on the outer side, and inclined towards the lip, which 

 is broad and semicircular : the sternum is heart-shaped : the 

 legs are long and provided with hairs; the first pair is the 

 longest, then the fourth, and the third pair is the shortest ; each 

 tarsus is terminated by three claws ; the two superior ones are 

 curved and pectinated, and the inferior one is inflected near its 

 base : the palpi are short, and have a small, curved, pectinated 

 claw at their extremity. These parts are of a dull yellowish- 

 brown colour; the extremity of the falces is faintly tinged with 

 red, and a fine black line extends along each lateral margin of 



