500 BRITISH ORIBATID^. 



another smaller pair of apophyses with curved terminal 

 spines, lower in level, and nearer to the median line. 

 There are three pairs of shortish, curved, rod-like 

 hairs on the notogaster ; many of these are generally 

 rubbed off or hidden by dirt. Genital and anal plates 

 close together, the former almost pentagonal, not much 

 wider than the latter, which are pointed posteriorly. 

 Dorsal plate much sufflexed on to the ventral surface ; 

 ventral plate very narrow. 



It must be remembered that the villous processes 

 are usually rubbed off, or concealed by dirt, and that 

 much of the above detail can only be seen in cleaned 

 specimens. 



Nymjpli. 



The nymph is extremely like the adult, and can 

 be at once known ; the differences are its softer 

 cuticle, lighter colour, which is pale drab, sometimes 

 yellowish-white, its slightly more arched notogaster, 

 monodactyle claws, and that the rostrum and all other 

 parts are softer and less angular in outline, and the 

 apophyses from which the great spines arise are not 

 so long or chitinous as those of the adult, but spring 

 from large mamilliform elevations. 



Distribution. — Generally distributed, but I have not 

 ever found it very abundant. The species has been 

 recorded in Germany, France, and Italy. 



NoTHRUS iNVENUSTus,* sp. nov. PI. XLYIIa, fig. 12 ; 

 PI. XLYII, fig. 6. 



Average length about 'QQ mm. 



Average breadth about '33 mm. 



Average length of legs (first pair) about "30 mm. 



Average length of legs (second pair) about '24 mm. 



Average length of legs (third pair) about "27 mm. 



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



* Invenustus, unhandsome. 



