192 RECORDS OF THE AUSTRALIAN MUSEUM. 



group, and it is scarcely to be marvelled that they should, before 

 they were properly understood, have been regarded as occupying 

 a position in the domain of botany. These mites differ from all 

 others in that the adults have only four legs, all seated near the 

 anterior part of the body. The animal is long and tapering, 

 divided into two parts — cephalothorax and abdomen ; the former 

 is short and broad, the latter long and multi-articulate. 



Genus Eriophes, Sieh. & Nal. 



Eriophes pyri, Payenst. 



Eriophes pyri, Pagenst., Verb. Ver. Heidelberg, i., 1857, p. 48. 

 Phytojjhus pyri, Nal., Anz. Ak. Wien., xxvi., 1889, p. 162; Sitzb. 



Ak. Wien, xcix., 1890, p. 50, pi. iv., f. 1, 2. 

 Phytophus arianus + P. cofoneast7-i + P. sorhi, Canest., Atti. 



Soc. Ven.-Trent., xii., 1890, pp. 16, 20, 21, pi., f. 7-9, pi. vi., 



f. 14. 

 Phytophus aronicf, Canest., Difesa dai Parassiti, i., 1890, p. 282. 

 Phytophus pyri, French, Handb. Destruc. Ins. Vict., pt. 1, 1891, 



pp. 119-123, pi. xiv. 

 Eriophyes piri, Nal., Das Tier., Lief. 4, 1898, p. 25. 



Host Plmd. — Pear trees. 



Hah. — Cosmopolitan ; Australia (introduced). 



Family DEMODECID^. 



A small family consisting of one genus and a few species. 

 The species are all parasitic, the host affected being the human 

 subject, domesticated animals and Mtis muscidus, Linn. The 

 mites lurk in the sebaceous glands and hair follicles ; they are 

 small, elongate, with eight three-jointed legs, thorax broad, 

 abdomen tapering, transversely striated above and below, and 

 rounded off at posterior extremity. One species only appears to 

 be known as occurring here. Stringent quarantine laws are 

 responsible for the immunity of our domestic animals. 



Gemis Demodex, Owen. 



Demodex folliculorum, G. Simon. 



Demodex folliculorum., G. Simon, Arach. Anat. Physiol. Med., 



1842, pp. 218-237, pi. xi. 

 Acarus folliculornm, G. Simon, loc. cit. 

 Dermodex folliciilorum,, Owen, Lect. Invert. Anat., 1843, p. 252. 



