THE GEXUS DEMODEX, 27 



5. DEMODEX PHYLLOIDES, Csokor, 1879. 



D. pliyJloides, Csokor, Oest. Viertoljalirsclir. f. Voteriniirk., 1879, vol. li. p. 133. 



P.folliculormn var. suis, Railliet, Zool. 2nd Ed. 1895, p. G37. 



D. phylloides, Canestrini, Prospetto dell' Acarofauna Ital. 1899, part 8, p. 968. 



(Plate V. figs. 22, 24 ) 



S . D. j)h^lloides is a short and rather wide species, the total length 

 of the body being about three and a half times as long as the width of 

 the cephalothorax. Abdomen a little longer than cephalothorax+ 

 capitulum, and its posterior end abruptly narrowed to form a short 

 tail-like process. Capitulum a little wider than long; tubercles on 

 dorsal surface very short and inconspicuous. 



6 . Male sexual orifice situated dorsally just in front of transverse 

 groove between first and second legs. Penis fairly long. 



Author's measurements : — 



Female. 



Total length of body (incl. capitulum) . . . 198-230/* 



Length of cephalothorax + capitulum . . . . 98-118 fi 



„ abdomen 100-113/* 



Greatest width of ceplialotliorax .... 59 /x 



„ „ abdomen ? 



„ „ capitulum (at base) . . 32-40 /* 



Lengtli of capitulum 33-37 /* 



According to Gmeiner, average measurements of D. phi/Iloides are 

 as follows : — 



Female. Male. 



Total length of body •2i mm. -22 mm. 



Length of capitulum "04 „ -039 „ 



Width „ -035 „ -036 „ 



Length of thorax -07 „ -061 „ 



Width „ -06 „ -057 „ 



Length of abdomen -13 „ "12 „ 



Length of egg 'Oo mm. 



Width „ -023 „ 



Length of larva •14 „ 



Width „ -04 „ 



Length of nymph ..... "26 „ 



Width „ -06 „ 



Host : The Pig (Sus scrofa). Numerous specimens from minute boils in the hide 

 of a pig from the Argentine. This material is preserved in spirit and was presented 

 to the Museum by Lt.-Col. A. W. Alcock, F.E.S., of the London School of Tropical 

 Medicine (see also Dr. H. B. Newham's paper * which deals with the same material). 



* Vet. Eecord, 1014, vol. xxvii. pp. 319-320, 2 figs. 



