Mr. J. Blackwall on new species of Madeira a Spiders. 255 



XXVI. — Descriptions of newly-discovered Spiders captured by 

 James Yate Johnson, Esq., in the Island of Madeira. By 

 John Blackball, F.L.S. 



The spiders here described were comprised in an extensive and 

 very interesting collection of Arachnida made in the Island of 

 Madeira, in the year 1858, by James Yate Johnson, Esq., who 

 transmitted the whole to me for examination, kindly permitting 

 me to describe such species as might appear to be new to 

 science. 



Tribe Octonoculina. 



Family Duassid^e. 



Genus Clubiona, Latr. 



Clubiona albidula. 



Length of the female ^ths of an inch ; length of the cephalo- 

 thorax ^ ; breadth y^ ; breadth of the abdomen £ ; length of 

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



The eyes are nearly equal in size, and are disposed in two 

 transverse rows on the anterior part of the cephalothorax, the 

 anterior row being situated immediately above its frontal mar- 

 gin ; the intermediate eyes of both rows form a trapezoid, whose 

 anterior side is rather the shortest, and those of each lateral pair 

 are seated obliquely on a tubercle. The cephalothorax is oval, 

 convex, glossy, depressed before, and broadly rounded in front ; 

 it is of a pale, dull yellowish colour, faintly tinged with red in 

 the region of the eyes, and has an obscure soot-coloured band 

 extending along the middle, from which an oblique line of the 

 same hue passes on each side of the cephalic region. The falces 

 are powerful, conical, vertical, and of a red-brown colour. The 

 maxillas are straight, and enlarged and rounded at the extremity : 

 the lip is longer than broad, and truncated at its apex. These 

 organs have a yellowish-brown hue, the lip being much the 

 brownest. The sternum is oblong, heart-shaped, with minute 

 prominences on the sides, opposite to the legs : the legs are 

 slender and provided with hairs and fine sessile spines ; the first 

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

 shortest ; each tarsus is terminated by two curved, pectinated 

 claws, below which there is a small scopula. These parts, with 

 the palpi, have a very pale yellowish hue. The abdomen is ovi- 

 form, convex above, and projects a little over the base of the 

 cephalothorax ; it is thinly clothed with short hairs, and of a 

 yellowish-white colour ; the margin of the sexual organs forms 

 an oval opening posteriorly, and has a dark reddish-brown hue. 



This Clubiona was found among plants brought from the 

 mountains in the vicinity of Estreito. 



