0. megnini 



77 



the young spiny stage and the adult form, a difference that is so great 

 that the two stages have been described as belonging to different 

 species " (Salmon and Stiles). The identity of the different stages 

 has, however, been fully established by Neumann and Salmon and 

 Stiles. 



Hosts : occurs chiefly in the ears of the horse, ass, ox, and not 

 infrequently in the human ear in Mexico (Duges). Simpson (1901) has 

 reported a case in which two spinose nymphs occurred in the ear of a 

 gentleman who came to England from Arizona where he had been 

 camping in June. One tick came away and the other was removed in 

 the end of August. 



Fig. ill. 

 0. megnini. 



Fig. 112. 



Fig. 111. 0. megnini. Leg of larva, tarsus I in profile. 

 Fig. 112. 0. megnini. Larva, gorged, so-called "resting- or pupa-stage." 

 Both figures from Salmon and Stiles, 1901 (figs. 108 and 104. 

 17th Ann. Rep. B.A.I., U.S. Dept. Agric). 



Geographical distribution : it was first described from Mexico by 

 Duges (1883), who states it is very abundant in the State of Guanajuato, 

 and it has been reported from various parts of the United States, i.e. 

 Louisiana, Texas, New Mexico, Arizona, California, Nevada, Idaho, Iowa, 

 Kentucky, Kansas and Nebraska (Salmon and Stiles, 1901, p. 411 ; 

 Banks, 1908, p. 17). 



