ACARI FEOM NEW ZEALAND. 143 



outer edge by a series of chitinous tubercles similar to those on the cephalo- 

 thorax above described, but very much smaller ; they bear hairs at their distal 

 ends, like those of the cephalothorax, but much shorter and smaller. These 

 tubercles and hairs are on the outer edges of all the joints except the coxaa^ 

 of the 1st, 2nd, and 4:th legs and the tarsi of the 3rd and 4th legs ; they 

 also are found, very small in size, on the inner edges of the femora, genuals, 

 and tibise ; they vary very much in number on the different joints, thus 

 there are five on the outer edge of the femur of the second leg and only one 

 on that of the genual of the same leg ; they also vary very much in size, the 

 largest are on the outside of the coxa of the third leg. Each leg is terminated 

 by a very small and weak triple claw, about '035 mm. in length. The third 

 and fourth legs spring from projections of the underside of the abdomen ; that 

 supporting the third leg bears a large apophysis. 



Abdomen not quite twice as long as its greatest width ; its anterior edge 

 straight except a shallow, rectangular, median indentation. The width 

 gradually increases from the anterior margin backward for about two-thirds 

 of its length, in this part the lateral margins are slightly convex ; then it 

 rapidly narrows to the posterior margin, the lateral margins of this portion 

 are concave. The hind margin is strongly concave. The notogaster is rather 

 narrow and is partly embraced by the chitinous plates of the side of the 

 abdomen ; these bulge out beloAv the notogaster so that the abdomen is wider 

 midway between the dorsal and ventral surfaces than it is on the actual dorsal 

 surface. At each postero-lateral angle of the notogaster is a large apophysis, 

 similar to those on the cephalothorax, but larger ; it turns slightly outward 

 near its distal end, which bears a thick hair not quite as long as the apophysis 

 and a little curved (PI. 19. fig. 16). On the lateral margin, on each side of 

 the body, and almost touching the last-mentioned apophysis, is another 

 apophysis, similar but only about a third of the length, and there is another 

 a little further forward on the lateral margin. These three apophyses are 

 usually within small membranous-looking sacs which are really the cast skins 

 of the similarly-placed apophyses of the fully-grown nymph ; each bears 

 the terminal hair of the corresponding apophysis of the nymph. As the 

 nymphal apophyses and hairs are much larger than those of the adult each of 

 these apophyses of the adult appears to be in a pointed, or nearly pointed, 

 semi-transparent sac, which bears a hair much larger, thicker, and more 

 curved than that of the adult ; these hairs are directed backward, but are 

 strongly curved ; each hair crosses those posterior to itself, and thus forms 

 the singular structure depicted in PI. 19, figs. 13-14, which is drawn from a 

 creature carrying the cast skins. There is a fourth apophysis further forward 

 and a fifth immediately below that at the postero-lateral corner, and hidden 

 by it when seen from the dorsal side. 



Ventral snrface. Maxillary lip practically covering the whole mouth- 

 opening. Epimera not reaching the median line but nearer together where 



