24 



STUDIES ON ACAKI. 



1). cnnis. — Gmeiner gives the following average measurements of 

 this species : — 



Host : The Dog {Conis famUiaris). 



DEMODEX CANIS var. OVIS, Raill. 1895. 

 D. folliadorxim var. ovis, Railliet, Zool. Med. Agric. 1805, 2nd Ed., p. G38. 

 (Plate III. fig. 13 ; Plate IV. fig. 16.) 



? . The Bemodex of the sheep is a slender elongated form, very 

 similar to B. cam's in most respects, but slightly shorter, and with 

 the capituliim rather Avider, for it is very distinctly wider than long. 

 Body from 5J to almost seven times as long as the width of the 

 cephalothorax. Abdomen considerably longer than cephalothorax + 

 capitulum ; in elongated specimens it measures up to about twice 

 their combined length. Dorsal spines of capitulum quite short as in 

 J), canis. 



Author's measurements: — 



Female. 



Total length of body (incl. capitulum) .... 221-233/* 



Length of ceplialothorax + eapiliiliiin 87-94 /x 



• „ abdomen 134-139 /j. 



Greatest width of cephalothorax 44 /t 



„ „ abdomen 45 /a 



„ „ capitulum (at base) .... 29/* 



Length of capitulum 22 /t 



S])iiies on capitulnm about 3 /* 



Host : Sheep {Ovis aries). Several adult female speciuiens from the eyelids of a 

 freshly killed sheep. 



Note. — Majocchi considers the Demode.v of the sheep to be identical with that of the 

 dog, and it is possible that he is right. 



