NOTHRUS SEGNIS. 517 



convenient means of distinguishing the species from 

 N. horridus. The raised lateral margin on each side 

 bears three similar hairs and apophyses, the latter are 

 very small and do not jnvject heyondthe lateral margin. 

 The pore of the expulsory vesicle is near the last of 

 these apophyses. There are six similar hairs by the 

 progaster. Genital and anal plates close together, the 

 former the wider and somewhat pentagonal ; the latter 

 longer and coming to a point posteriorly. 



Distribution. — Common and generally distributed ; 

 it may be obtained in abundance by beating trees in 

 spring, especially oaks. The species has been 

 recorded in Germany, France, and Italy. 



Ts'oTHRUs SEGNis* (Hemi.). PI. XLVIII, figs. 1 — 6. 



Notaspis segnis, Herm. P. 94, pi. iv, fig. 8. 

 Nothrus — Kocli. Heft 31, fig. I. 



— — Haller. P. 306. 



— — Can. e. Fan., p. 27. 



— — Berlese. Acari, &c. Ital., fasc. xvii, fig. 2, and 



Notes, fasc. iii, p. 8. 



— — G. Canestrini. Prospetto d. Acarofaun. Ital., 



p. 31. 

 Oribata — Gervais. T. iii, p. 25^. 

 Nothrus fnrcatus, Koch. Heft 30, fig. 3. Nympb. 



— biurus, — Heft 30, fig. 2. Nymph ? 



— — Can. e Fan., p. 27. Nymph. 



Average length about '85 mm. 



Average breadth about "32 mm. 



Average length of legs (first pair) about "45 mm. 



Average length of legs (second pair) about '33 mm. 



Average length of legs (third pair) about "38 mm. 



Average length of legs (fourth pair) about '48 mm. 



This singular creature may be known by the great 

 length of the abdomen in proportion to its width, and 

 by the strange way in which it carries the cast skins 

 of the two conical tail-like processes which terminate 

 the abdomen of the nymph. 



* Segnis, lazy. 



