37,0 



MR. STANLEY HIRST ON 



width of cephalothorax 29 fi, of abdomen 30 fx, length of 

 capitulum 18 [.,, its width 17 yu. The short wide form measures 

 as _ follows :— Total length 103 >, length of cephalothorax + 

 capitulum 56 )u, of abdomen 47 /i, greatest width of ceplialothorax 

 35 ^, of abdomen 36 p, length of capitulum 15 /x, its width 15 ^. 



Host. Water-rat {Arvicola amphihius) ; two male specimens 

 collected by the author from freshly-killed examples of this 

 mammal (July 1919). 



Text-figure 13. 



ii 



Highley del 



Demodex taljpa. 



A. Dorsal view of female. B. Ventral view of male. C. Penis greatly enlarged. 



'Note. — The sexual orifice of the male is really dorsal in position and 



the penis situated in the median line. 



Demodex talp^e, sp. n, (Text-fig. 13.) 



$ . Body about four times as long as the width of the cephalo- 

 thorax. Cephalothorax usually rather nari'ow in front, becoming 

 a little wider posteriorly. There is a well-defined longitudinal 



