442 Mr. J. Blackwall on some undescribed Araneida?. 



red colour; several of the anterior bands have their continuity slightly in- 

 terrupted in the medial line, but the posterior ones preserve theirs entire; 

 the colour of the under side is very dark brown, with the exception of the 

 lips of the four spiracles, which are reddish. At the posterior extremity of 

 the abdomen are four spinning mammulae; the two superior ones are very 

 long and prominent, each consisting of three joints, and the two inferior 

 ones are small ; on the former, which Lyonnet, Treviranus, and other 

 skilful zootomists have regarded as anal palpi merely, (palpes de fanus,) 

 denying that they perform the office of spinners, the papillae or spinning 

 tubes are arranged along the under side of the terminal joint. 



Length, from the most prominent part of the mandibles to the extremity 

 of the abdomen, not including the spinners, 1 inch and Hths; length, 

 from the anterior margin of the cephalothorax to the extremity of the ab- 

 domen, 1^; length of the cephalothorax ±1 ; breadth -^ ; length of an 

 anterior leg 3» ; length of a posterior leg 3 T \ T ; length of the nails at the 

 extremity of the mandibles, following their curve, f; length of a superior 

 spinning mammula \. 



Specimens of this spider are deposited in the Museum belonging to the 

 Society for the promotion of natural history established in Manchester; 

 but I am not able to state in what quarter of the globe they were pro- 

 cured. 



Genus, Cteniza, Latreille. 



Cteniza spinosa. 



The Manchester Museum contains a specimen of a female spider, be- 

 longing to the genus Cteniza, which does not appear to coincide with any 

 species given by M. Latreille, under the head " Mygale" in the second 

 edition of the Nouveau Dictionnaire d'Histoire Naturelle ; I have ventured, 

 therefore, to describe it as new to arachnologists. 



Cephalothorax of an irregular oval figure, convex above, and glossy, 

 with an indented, curved line, whose convexity is directed towards the 

 abdomen, occupying its posterior region. The eyes are seated on a small 

 frontal eminence, and, in dead specimens, are of a yellow hue ; three on 

 each side, of an oval shape, form an irregular triangle whose apex is di- 

 rected forwards, the two anterior ones being the largest of the eight, and 

 the other two, which are circular, are situated on a transverse line be- 

 tween the preceding groups. Mandibles very powerful, articulated hori- 

 zontally, prominent, and curved; they have a bold projection on the upper 

 side of their anterior extremity, just above the insertion of the nail, which 

 is furnished with numerous short, acute, black spines ; and their inferior 

 surface is armed with two longitudinal rows of teeth, the interval between 

 them being occupied by a strong, black nail, when in a state of repose. 

 Maxillae robust, divergent, densely fringed with long, red hairs on the inner 

 margin, and provided with small, sharp, black spines underneath. The lip, 

 which is quadrate, has some minute, black spines at its apex. Pectus 

 nearly circular, and glabrous. Legs short, powerful, and provided with 

 long hairs, particularly on the under side ; the fourth pair is the longest, 

 then the first, the third pair being a little shorter than the second. The 

 thighs of the first and second pairs are compressed and slightly curved, the 

 second or anterior joint of the tibiae and the two tarsal joints being armed 

 on the sides with numerous short, strong, acute, black spines curving 

 downwards at their extremities, like small claws; the second joint of the 

 tibiae of the third pair of legs is greatly depressed on the upper side ; its 

 anterior extremity, and that of the epicnemis or first joint of the tibiae, 

 which are prominent, together with the tarsal joints, are furnished with 

 numerous short, strong, black spines on their superior surface; the tibiae 



