66 Genus Omithodoros 



is 2 1 2 throughout, the median rows being far apart. Four long hairs 

 (post-hypostomal and post-palpal) on the base of the capitulum, as in 

 0. avignyi. Legs fairly long and slender; coxae II — IV contiguous ; 

 tarsi 2 — 4 with terminal dorsal protuberance prominent, pointed and 

 directed distally, the terminal portion tapering. Short hairs on all 

 articles, longest on the tarsi. 



? 

 $ 



Fig. 93. Fig. 94. 



Figs. 93 and 94. 0. tholozani. Left digits of g and ? . (Nn. 1896, fig. 35.) 



Nymph : resembles the male but has no sexual orifice. 



Larva : 1 x 5 mm. when newly hatched ; a circular dorsal area 

 (disc ?) ; the intestinal caeca pass into the legs (Laboulbene and Megnin). 



Egg: yellowish brown, - 8x - 6mm.; about 100 laid by each $ 

 (Laboulbene and Megnin). 



This species is allied to 0. erraticus, from which it may be distin- 

 guished by its tarsi and the dimorphism of the hypostome. 



Origin : Persia, where Neumann states they were collected by 

 Tholozan, mostly in a chicken yard at Teheran, others were found on 

 camels (specimens in Paris Mus.). 



The above descriptions of the adult and nymph are condensed from 

 Neumann, who has communicated certain particulars by letter (6 April, 

 1908), stating that Laboulbene and Megnin figure the tarsus inaccurately, 

 and that his description is based on the examination of specimens 

 received at the Paris Museum from Dr Tholozan at the time when 

 Laboulbene and Megnin received theirs from the same source. We have, 

 unfortunately, not succeeded in obtaining a specimen of this tick. 

 Neumann's description does not agree in some respects with Laboulbene 

 and Me*gnin's figures, but he assures us that these are inaccurate. 



Laboulbene and Megnin (1882, p. 329) state that they were fed on 

 man and rabbits in Paris and (p. 337) that unfed specimens survived 

 four years. 



