TERRESTRIAL ACARI OF THE TYNE PROVINCE 409 



PHTHIRACARUS, Perty. 



Cuticle of dorsum irregularly striate ... arduus 



Cuticle of dorsum spotted ... ... ... bagnallii 



157. Phthiracarus arduus, K. 66b, 67c. 



Essex, Surrey, Staffs. B.O.). Lancashire, Cheshire, 

 Scotland, Ireland. 



15S. Phthiracarus bagnallii, sp. nov. 66b. 



Length about 600^. 



Seen from below the outline of the abdomen is 

 elliptic-oblong ; above the dorsum adjacent to the 

 posterior margin is slightly compressed laterally. 



The dorsum is pale pinkish, smooth and shining, 

 but uniformly pitted (about 100 to the linear 

 millimetre). The aestheteria are rather large and 

 the sensillus is characteristic — strongly elbowed 

 about a third of its length from the base ; below 

 the elbow gently curved, above quite straight, a 

 bluntly clavate opiculate head forming the distal 

 third. 



Stables at Gibside, Durham, January, 19 15 (Bagnall). 

 A single specimen at Fatfield, December, 19 15 

 (Bagnall). 



REFERENCES TO PLATE XVII. 



1. Melanozetes (?) cambricus, side view (legs omitted). 



2. Phthiracarus bagnallii, ventral view omitting cephalothoracic 



appendage ; (a) side view of abdomen. 



3. Oribatula carnca. dorsal view ; (a) leg of first pair. 



4. Heminothrus valentianus, half of dorsal aspect. 



5. Pelops approximatus, dorsal view. 



6. Chamobates vartismithii, dorsal view, slightly oblique ; (a) leg ot 



first pair. 



7. Oribatula anomala, oblique dorsal view (legs and dorsal hairs omitted). 



8. Oribatula humerata, oblique dorsal view (legs and dorsal hairs omitted) 



9. Amolops bagnallii, sensillus. 



