NEW OR LlTl'LE-KNOWN ACARI. 



Text-fioure 7. 



363 



Ulnnont/ssiis coniventris, $. Ventral view. 



Hairs on uncovered part of dorsum not very numerous and 

 mostly shorter than those on the venter. Sternal plate wider 

 than long and with three pairs of long hairs, its anterior margin 

 is not well defined, being continued forwards by transverse linear 

 markings that reach the front end of the body. Genito-ventral 

 plate short, of moderate width, and the posterior end is blunt 

 (not pointed). Anal plate of the usual pyriform shape, but more 

 elongated than usual, Peritreme reaching forwards almost to the 

 level of the middle of the coxa of the first leg. Legs normal in 

 appearance, being of moderate length. Second coxa with a long, 

 sharp anterior spine and a very slight rounded spur posteriorly. 

 Third coxa posteriorly Avitli a sharp, well-developed inner spur, 

 and an inconspicuous outer denticle. Tarsus of second leg with a 

 pair of short pointed denticles at the end. The hairs on the le<^s 

 are shown too strong (spinifoi^m) in the figures of this species. 

 They are more hair-like. 



Length (including capitulum) •87--90, width •36--44 mm. 



ILabitat. Parasitic on Myospalax scansus, Shensi, North China ; 

 several specimens collected by Capt. H. E. M. Douglas (24 xi 

 1908). 



Proc. Zool. Soc— 1921, No. XXY, §| 



