NOTASPIS LAOUSTRIS. 403 



Nymjph. 



Colour a dingy-wliite, passing into pale ochre- 

 colour ; legs and rostrum pinkish. 



Texture leathery. 



Cephalothorax. — Rostrum rather narrow, clearly 

 marked off from the hinder part of the cephalo- 

 thorax, which is dilated and nearly as broad as the 

 abdomen, somewhat wrinkled, but without conspi- 

 cuous markings. Rostral hairs short and curved, no 

 pseudo-stigmata nor pseudo-stigmatic organs visible 

 upon ordinary examination at the times of year when 

 I have usually found the creature. In some specimens 

 obtained early in May, 1887, although there were not 

 any open pseudo -stigmata yet there were fine setiform 

 pseudo-stigmatic organs, and very short spike-like 

 interlamellar hairs close to them; there were also 

 extremely fine lamellar hairs ; all these were very 

 caducent ; they are not drawn in the figure. 



Legs much like those of the adult, but the two front 

 pairs of femora shorter and thicker, and the other 

 joints more even in thickness and shape. Tactile 

 hairs very long and black on all the legs ; the other 

 hairs on the legs are mostly short, and, excepting the 

 fine hairs on the tarsi, chiefly thorn-like. 



Abdomen oval, truncated, and somewhat concave at 

 the progaster. The whole notogaster is covered with 

 broad, irregular, wavy wrinkles extending from side 

 to side. The elevated ridge of each wrinkle bears 

 a series of round knobs or bosses. Round the hind 

 margin are six thick, flexuous, intensely-black hairs, as 

 long as the whole body of the creature. Between the 

 two central of these hairs is a considerable space in 

 which are a pair of large spikes directed backward, 

 then on each side is a pair of the long hairs near to- 

 gether, then another space containing another spike, 

 and then the third long hair. 



Distribution. — Found in ponds and on fresh-water 



