368 



MR. STANLEY HIRST ON 



elougated. Body wide, the abdomen pointed posteriorly. (Both 

 my specimens of this species are shghtly damaged, and it is diffi- 

 cnlt to give the exact proportions.) Capitulum apparently 

 withoutany dorsal tubercle or spinule ; it is rather like that of a 

 nymph in some respects. 



Mecmirements. Total length 229 /a, length of cephalothorax4- 

 capitnlum 114-115 /a, of abdomen 115 /x, ? ; greatest width of 

 cephalothorax 59-61 /a, of abdomen ?. 



Host. Long-eared bat (Flecotits auritus) ; two specimens col- 

 lected by the author (October 21st, 1919). 



Demodex soricinus Hirst. 



$ . I have found several specimens of a small form of Demodex 

 in the skin of long-eared bats, which is very similar to that 

 found in rats and shrew-mice described under the name soricinus. 

 The capitulum in these specimens from bats is apparently without 

 any dorsal tubercle or spinule. The body is somewhat difterently 

 shaped, the posterior end of the abdomen being blunt (almost 

 rounded), instead of pointed as in typical specimens of the 

 species. Capitulum considern.bl}- wider than long. Abdomen a 

 little shorter than cephalothorax + capitulum ; bod}- a little more 

 than three times as long as its width. 



Measurements. Total length 111-128 /x; length of cephalo- 

 thorax -f- capitulum 63-75 y[(, length of abdomen' 52-53 jx, width 

 of cephalothorax 33-38 fx, width o'f abdomen 33-36 ^i, of capitulum 

 18-23 M, length of capitulum 13-19 ^(. 



Material. Several specimens from live long-eared bats (Plecotus 

 auritus), collected by the author, October 1919. 



Demodex gliricolens, sp. n. (var. of B. arvicokc ?). (Text- 

 fig. 12.) 



<S . Body varying rather considerably in shape. One specimen 

 is rather narrow and elongated, and about five times as long as 

 wide. Abdomen of this example distinctly longer than the 

 cephalothorax -f capitulum. Capitulum rather narrow and fairly 

 elongated (about as long as wide). 



Another specimen is much shorter and comparatively wide, 

 being about three times the width of the cephalothorax. The 

 abdomen is slightly shorter than the united length of cephalo- 

 thorax and capitulum. Capitulum of this specimen rather wide, 

 being wider than lono-. 



Posterior end of abdomen rounded oft' in this species. Spinule 

 on dorsal surface of capitulum smaller and more slender than is 

 usually the case in D. arvicola'. 



Genital opening of male situated on the dorsal sui'face above 

 the interval between the first and second pairs of legs, in this 

 respect resembling D. ermineoi ; the opening is, however, very 

 simple, consisting merely of a curved line. 



Measurements. Slender example. Total length 144 /x,, length 

 of cephalothorax -f capitulum 70 /x, of abdomen 74 /a, greatest 



