368 BRITISH OEIBATIDJ]. 



There is a somewhat irregular row of very long, flexible, 

 serrated hairs round the margin of the notogaster, and 

 two rows of about three similar hairs rather nearer to 

 the median line. Ventral plate small, truncated ante- 

 riorly, where it is widest ; rounded and narrow poste- 

 riorly, where it bears three pairs of serrated hairs. 

 Genital and anal plates large; the former almost 

 square, the latter diamond-shaped. Ovipositor short 

 for the genus. 



Nym]ph. 



The usual appearance of this nymph is of an irre- 

 gular lump of small pieces of lichen, white powder, and 

 other debris, from which springs a forest of long, ser- 

 rated hairs, standing out on every side far beyond the 

 body. 



Colour pale fawn or mouse colour, but little of the 

 true tint is seen, however, the cuticle being in most 

 instances chiefly concealed by the quantity of the 

 above-named materials which adhere to it, and to the 

 long hairs. 



Texture rough and leathery. 



Shape almost oblong. 



Cephalothorax distinctly divided into two parts, the 

 rostrum being much narrower than the hinder portion, 

 which is almost as wide as the abdomen. Rostral hairs 

 large, serrated, curving strongly inward, the two 

 usually crossing in front of the rostrum. Pseudo- 

 stigmatic organs rather dorsal, of moderate length, 

 with short pyriform heads on filiform peduncles. 

 Interlamellar hairs long, thick, strongly serrated, and 

 standing nearly upright. 



Legs short, the fourth pair scarcely reaching the 

 hind margin ; they are inserted near together and are 

 thick ; the femora of the two front pairs are consider- 

 ably enlarged. The tactile hairs are large on all the 

 legs, and there is a whorl of stout, strongly-curved, 

 serrated hairs on each of the three central joints of 

 each leg. The tarsi have fine hairs as usual. 



