On Four neio Species of the Genus Demodex. 145 



XI. — On Four new Species of the Genus Demodex, Owen. 

 By Stanley Hirst. 



(Published by permission of the Trustees of the British Museum.) 



Demodex soricinus, sp. n. 



? . A small species, the ceplialothorax being fairly wide. 

 Body a little more than three times the width of the ceplialo- 

 tliorax. Abdomen pointed |)osteriorly and somewhat longer 

 than ceplialothorax + capitulum. Capitulum much wider 

 than long. (The spines on the capitulum cannot be seen in 

 the unique specimen, which lies ventral side uppermost.) 



Total length 119 fi. 



Host : Sorex vulgaris. 



Demodex apodemi^ sp. n. 



? . A very minute but fairly elongated specie;?. Body 

 about 4^ times as long as the greatest width of the ceplialo- 

 thorax. Abdomen a little less than twice the combined 

 length of cephalothorax and capitulum. Capitulum (at base) 

 wider than the length. Spines on dorsal surface of capitulum 

 well developed, being pointed at the end as in D. musculi 

 etc. 



Total length 139 /x. 



(J . Body from a little more than 4 up to about 5 times as 

 long as width of cephalothorax. Capitulum when fully 

 extended about as long as wide. 



JMale sexual aperture situated above interval between 

 second and third pairs of legs. Penis fairly long and 

 slender. 



Host : Apodemus sylvaticus. 



Demodex longior^ sp. n. 



? . An elongated species of comparatively large size, 

 resembling D. cam's in many respects. Body sometimes 

 nearly nine times as long as the width of the cephalothorax. 

 Abdomen about 2§ times the combined length of cephalo- 

 thorax and capitulum. Capitulum wider than long ; the 

 spines on its dorsal surface arc short and somewhat curved. 



Total length 280 /i. 



(J . Abdomen about twice as long as the cephalothorax + 

 capitulum. Body more than 6 times as long as the cephalo- 



