TEERESTRIAL ACARI OK THE TYNE PROVINCE 25 



29. Rhyncholophus pachypus, sp. nov. 67. 



Distinguished from the preceding by the nude setae, 

 which are of varying length and comparatively 

 iew. Also the legs are much thicker, and the pro- 

 portions of the articles are different (compare the 

 following measures of the fourth leg with those 

 given above — 130, 130, 280, 320, 400, 170). The 

 dorsum is unicolorous. (Fig. 59). 



West Allendale, at 900 feet. I have also received it 

 from Yorkshire (Cleveland). 



RITTERIA Kramer. 

 Eyes 2. Body large and almost quadrate, not 

 rounded behind, widest at the shoulders. Dorsal 

 trichomes opaque, serrulate. Crista not projecting 

 beyond the fore margin. 

 Type : Tie/norum, Koch. 



I. Three white spots on the dorsum ... ... triiiiacidata. 



Dorsum without spots ... ... ... ... neviortivi. 



30. Rltterla nemorum, Koch. 2,200/x,. 66, 67, 68. 



The most abundant species in this family, met with 

 chiefly in the larval (on various Opiliones) and 

 adult forms. Note that under the microscope 

 some of the trichomes (which are all black) may 

 appear white by reflected light. The cuticle is 

 clear red. 



var. vertex, Kramer, has the long trichomes of the 

 anterior sensillar area serrulate, not smooth as in 

 the type. General and common. 



31. Ritteria trimaculata, Herm. 



I have met with this species only in a sedgy bog in 

 Delamere Forest, where it was plentiful. It is 

 narrower than nemorum. The dorsal trichomes are 

 brown except two large humeral spots (reniform) 

 of white trichomes, and another behind generally 

 smaller and more or less circular. Cuticle pallid. 



Scotland. 



