Oribatidce from the Sikkim Himalaya. By N. D. F. Pearce. 271 



distinctive ; they are thick blades on edge, widest apart posteriorly, 

 narrower and closely approximate anteriorly ; they do not touch, 

 however. Lamellar cusps short, rounded, not any central mucro. 

 Size 1300 fi. Baghghora, 6000 ft. 



Genus Chaunoproctus g. n. 



Apterogasterinae, with cephalothorax anchylosed to abdomen, 

 divided from it by an unbroken line. Abdomen broadly piriform, 

 areolated or rough. Cephalothorax shortly pyramidal, with lamellae 

 (and translamella) which are thin blades on edge. Legs long and 

 thin, not clavate or moniliform, femora of first pair with thin 

 peduncles. Claws tridactyle in all known species. 



This genus appears to be most nearly related to Cepheus ; in 

 some points it resembles Tegeocranus. 



15. C. cancellahis sp. n. — Dark brown, texture pitted or areo- 

 lated ; shape broadly piriform. Cephalothorax small in proportion, 

 with lamellae, which are narrow bars extending two-thirds of the 

 length of the cephalothorax, slightly converging and joined by a 

 translamella, which is a similar bar. Not any lamellar cusps. 

 Lamellar hairs long and fine. Pseudostigmatic organs shortish, 

 with thin peduncle and moderately clavate head. Abdomen almost 

 spherical, truncated anteriorly, a few long hairs on notogaster, and 

 round posterior margin. Legs, especially 1 and 4, very long, 

 femora of first pair with thin peduncles. Claws tridactyle. Genital 

 and anal plates large, near together. Size 720 /j,. One, dead. 

 Baghghora, 6000 ft. 



16. C. asperulus sp. n. — I unfortunately found only broken 

 specimens, which, however, I have no hesitation in referring to this 

 genus. Most of the preceding description holds good. 



Differences. — Texture rough, very slightly pitted. Lamellae 

 broader, extending further down the cephalothorax, and with long 

 cusps standing free beyond the translamella. Pseudostigmatic 

 organs longer, almost rod-like, but slightly enlarged distally. Size 

 840 fi. 



A nymph, probably of this species, occurred : it greatly resembles 

 the adult. Darjiling, 6500 ft. Baghghora, 6000 ft. 



Genus Notaspis. 



17. N. hamatus sp. n. — A small species of the splendens 

 type : it greatly resembles this in general appearance. The 

 lamellae are characteristic ; they arise near the pseudostigmata, and 

 converge anteriorly at an acute angle ; they do not meet. The 

 anterior ends are sharply recurved, and where they curve there is a 

 short, blunt cusp, looking upwards, from which the lamellar hair 

 springs. Pseudostigmatic organs shortish, with large, clavate heads. 

 Size 300 fi. One, living. Darjiling, 6000 ft. 



