32 STUDIES ON ACAEI. 



Presumably the short appendages and discs bearing denticles serve the 

 purpose of fixation and locomotion. 



Besides the nymphs described above, specimens of another stage are 

 met with which resemble the adults in almost every respect but are 

 more delicate in appearance (apparently being less strongly chitinised) ; 

 the dorsal spines on the capitulum are poorly developed in these 

 specimens. 



Larva very like the earlier nymphal stage. The appendages (epimera) 

 are minute, and only three instead of four in number, as in the nymphs. 

 Each epimeron bears a pair of very minute and inconspicuous tubercles 

 furnished with denticles as in the nymphs. Capitulum very wide. 



Ooum oval in shape (length 34 ju,, width 19 /x), its cuticle being thin 

 and delicate. Fig. 33, PL VII. shows a female with a fully developed 

 ovum in situ in the body. 



Author's measurements : — 



Female, Mule. 



Total length of body (inol. capit.) .... 173 /x 125-1.'52 n 



Length of cephalotliorax + capitulum ... 85 /* 68-72 /x. 



„ abdomen 98 «t 58-74 /a 



Greatest width of ceplialothoi-ax .... 39-41 /a ? 



„ „ abdomen 34 /a 31 /* 



„ ,, capitulum (at base) . . 27 /a 19-25 /x 



Length of capitulum . 20 /a 16 /a 



„ peuis — 16-22/1, 



Length of larva 50-59 /a 



Width of „ 30 /Lc 



Length of ovum 34 /t 



Width „ 19 w 



Host : Dorniouse [Muscardinus avcUanurius). Kumerous specimens found in the face 

 and eyelids of the five Dormice examined. 



9. DEMO'DEX EUMINEii:, sp. n. 



(Plate VIII. fig. 34.) 



cJ . A minute but fairly wide species, somewhat resembling B. equi 

 in general appearance, but much smaller, and with the spines on the 

 capitulum differently shaped. Body about o^ times as long as the 

 width of the cephalothorax. Cephalothorax + capitulum a little longer 

 than abdomen. Capitulum distinctly wider than long; spines on its 

 dorsal surface well developed and sharply pointed, much as in D. arvi- 

 colce ; the posterior side of the basal end of each spine is rather strongly 

 angular. Male sexual orifice situated above the interval between the 



