BY T. HARVEY JOHNSTON AND LAUNCELOT HARRISON. 21 



moreover, after having examined Giebel's^ 

 specimens, was convinced that Tr. pilosus, Giebel, 

 was also synonymous with Tr. panimpilosuSy 

 Piaget. He went on to state that the two species- 

 from horses should be quoted as Tr. pilostis, Piaget ^ 

 and Tr. parumpilosus, Piaget. Taschenberg does 

 not appear to have recognized that pilosus was^ 

 already preoccupied when Piaget adopted it, 

 Railliet (1895, p. 835) quoted Tr. pilosus, Piaget, 

 nee. Giebel, under the name Tr. vestitus. 



The synonymy of the two species is thus : — 

 {a) Pediculus equi, Linn. {b) Trichodectes equi, Denny^ 



Tr. pilosus, Piaget, nee. nee. L. 



Giebel. Tr. pilosus, Giebel, nec^ 



Tr, vestitus, Raill. • Pi^g- 



Tr. parumpilosus. Piaget, 



From the foregoing it will be seen that Giebel, without 

 any justification, renamed Denny's and Linnaeus' species^ 

 believing both to be identical. It has since been showiii 

 that his description really referred to Denny's form, and 

 not to Pedie equi, Linn. His name thus accidentally 

 becomes the valid one for Tr. equi, Denny, nee. Linn., with 

 Tr. parumpilosus, Piaget as synonym, while the Linnsean 

 species must stand for the less common parasite, Tr. equi 

 (L.), with Tr. pilosus, Piaget, nee. Giebel and Tr. vestitus^ 

 Raill, as synonyms. It might be stated here that Piaget's 

 names are those generally used, but from the above dis- 

 cussion it will be seen that this should not be the case.. 

 Osborn (1891, p. 45-7) followed Piaget's nomenclature. 



Ox {Bos taurus). 



1. Triehodectes hovis (L.)— Syn. Tr. scalaris, Xitzsch. 

 X.S.W., Johnston, 1911, p. 217. Queensland, 

 We have restored Linnaeus' specific name. 



8heep {Ovis aries). 



1. Trichodeetes ovis (L.), Raill. — vSyn. Tr. sphaeroee- 

 phalus, Xitzsch. Victoria, X.S. Wales. ;Lea (1908^ 

 p. 105), has recorded the presence of this species 

 under Xitzsch's name in Tasmania. 



