NKW OR LITTLE-KNOWN AC'ARI, 371 



groove running down the middle of the cephalothorax, Avhich 

 always seems to be present, and is the chief distinguishing 

 feature of the species. This groove is limited laterally by a 

 rather sharp line, which sometimes has the appearance of being 

 double (owing to the depth of the groove). Abdomen sometimes 

 with the sides slightly convex, and it is then distinctly wider 

 than the cephalothorax, in other specimens the abdomen is of 

 fairly uniform width throughout its length ; it is a little longer 

 than the cephalothorax. Capitulum fairly elongated, but still 

 it is slightly wider than long. Spinule on its dorsal surface 

 flattened in much the same way as in D. arvicolce, and pointed 

 distally (internally), the outer angle distinct. The spinule is 

 fairly thick, for under very high magnification a distinct posterior 

 edge can be seen ; it is fairly large and wide as compared with 

 the size of the capitulum. One of the little claws or denticles on 

 the ventral surface of the terminal segment of the palp is much 

 longer than the others. 



S • Male veiy like the female in general appearance and with 

 the dorsal groove well-developed. Body about four times as long 

 as width of cephalothorax, the abdomen being longer than the 

 cephalothorax -f- capitulum. Male sexual orifice situated on the 

 dorsal surface above the interval between the second and third 

 pairs of legs. Penis quite long and slender. 



Measioremeoits. 5 , Total length 128-130 /x, ; length of cephalo- 

 thorax + capitulum 59-62 fji, of abdomen 68-74 /x ; greatest 

 width of cephalothorax 31-34//-, of abdomen 34-41 /x. ; length of 

 capitulum 15-19 /x, its width 19-20 fi. d" . Total length 126 /a; 

 length of cephalothorax -[-capitulum 54 /x, of abdomen 72 /x, of 

 penis 22/x ; greatest width of cephalothorax 30-33 fx, of abdomen 

 37 fj. ; greatest width of capitulum 21 /x, its length 16 /x. 



Material. Several specimens obtained by the author from 

 freshly-killed moles (Talpa europcea); May 1919. 



Demodex bovis Stiles. 



I have examined specimens apparently referable to this species 

 collected by Dr. E. Brumpt from deer. The material consists of 

 a small piece of skin, preserved in spirit, containing a number 

 of pustules filled with whitish matter and numerous parasites in 

 all stages of developinent. The material is not very well pre-. 

 served. The following is a description of the adult specimens : — 

 2 . Shape very like typical examples of D. hovis, the body is from 

 a little more than three times to about three and a half times as 

 long as the cephalothoracic width. Abdomen not quite so sharply 

 pointed as in typical specimens of I), bovis ; it is nearly always 

 distinctl}^ longer (sometimes considerably longer) than the 

 cephalothorax 4- capitulum, but occasionally only about the same 

 length, Capitulum wider than long. Spinule on its dorsal sur- 

 face moderately long and distinctly bent or angular near the 

 distal end. 



