NOTHRUS SPINIGER. 497 



notogaster. Genital and anal plates very large, almost 

 touching, and extending nearly the whole length of the 

 abdomen. Anal plates long, narrow, curved exteriorly ; 

 genital plates almost circular, set in a pentagonal open- 

 ing. Ventral surface granular. 



Nym'ph. 



This creature is so Hke the adult that it could not 

 be mistaken. It would be waste of space to describe 

 it fully ; I shall merely point out the differences from 

 the perfect form. 



Colour of cephalothorax and legs light reddish- 

 brown, of abdomen yellowish-white. 



Cephalothorax. — The two longitudinal rolls are less 

 conspicuous than in the adult. 



Legs. — The coxge of the first two pairs are more 

 visible than in the adult. 



Abdomen flatter than in the imago, median part and 

 margin not raised. Progaster rather concave ; postero' 

 lateral angles produced so as to form large, conical tails, 

 which bear the great hairs. Central projection and 

 pair of hairs not always seen from above. Notogaster 

 granular, markings of the same size all over it. 



Distribution. — Found in moss on the ground, gene- 

 rally distributed, not uncommon. It has been recorded 

 in France, Grermany, and Italy. 



NOTHRUS SPINIGER,* KocJl. PI. XL VIII, figS. 7 — 13. 



Type species. 



Nothrus spinifer, Koch. Heft 2, fig. 18. 



— — Can. e. Fan., p. 28. 



— — G. Canestrini Acarofauna Ital., p. 32. 



— — Berlese. Acari, &c. Ital., fasc. xvii, pi. iii. 



— spiniger, Nic. p. 455. 



* Spina, a thorn, spine ; gero, I bear. 

 VOL. II. 32 



