286 Transactions. — Zoology. 



The maxillm are strong, slightly curved, divergeut, and cylindrical in 

 form, furnished with bristles and hairs, and a group of very short deep red- 

 brown tooth-hke spines at their hinder extremity, just above the labium. 



The labium is short, convex in front, of an oval form, broadly truncated 

 at its apex ; it is of a red-brown colour, the apex being of a yellow hue. 



The sternum is somewhat oblong, broader behind than in front ; the fore 

 extremity being deeply indented for the reception of the labium, and the 

 hinder extremity obtusely pointed, the surface is strongly convex, haixy, 

 and covered with very minute tubercular granulations. 



The abdomen is large, hairy (the colour of the hairs being sandy-grey, 

 mixed with others of a darker hue), of an oval form, very convex above, of 

 a dull yellow colour, marked on the upper side with transverse curved black, 

 more or less broken stripes, which run down over each side. These stripes 

 are composed of more or less confluent black spots, and are, some of them, 

 broken off in the middle, leaving an indistinct longitudinal central dull 

 yellow band. On the fore half of the abdomen the stripes are more con- 

 fluent than on the hinder half; the under side has an u'regular strongly 

 dentated black marking along the middle, but strongest and most distinct 

 at its fore extremity. The spinners are four in number, short and strong ; 

 those of the superior pair are three-jointed and upturned; the basal joint 

 being much the longest and strongest. The genital a^oerture consists merely 

 of two strong transverse contiguous labia. In one or two examples, the 

 under side of the abdomen is pretty thickly spotted with black, and there is 

 some small variety in the extent and clearness of the transverse stripes in 

 different examples. In very young specimens the stripes are simply rows 

 of spots. Notwithstanding the great difference of size, I cannot find any 

 other reliable specific variation in either of the twelve adults, and numerous 

 immature examples, examined. 



Adult male. — Length (exclusive of the falces) 6^ hues ; the only example 

 examined of this sex is of a generally lighter and clearer yellow ground 

 colour than the female, and the fore part of the caput is narrower, giving 

 the cephalo-thorax a more regularly oval form ; the normal grooves and 

 furrows (especially those which mark the union of the caput and thorax) are 

 strongly marked with reddish-brown ; the caput also has two longitudinal, 

 nearly parallel, brown lines, running from the eyes to the thoracic junction, 

 where the other markings also converge, and give the cephalo-thorax a 

 radiated appearance. The cephalo-thorax is clothed with dull, sandy-grey 

 adpressed hairs, and there are some erect bristles on the caput similar to 

 those of the female. 



The relative size and position of the eyes is the same as in the female, 

 although rather more closely grouped together. 



