500 THE ANIMAL PARASITES OF MAN 



Ixodes hexagonus, Leach, 1815. 

 Syn. : Ixodes sexpimctatus, Koch, 1897 ; /. vttlpis, Pagenstecher, 1861. 



Lives in the same manner as the foregoing ; especially attacks 

 hounds, but also other mammals and even birds. The difference 

 consists in the shape of the legs, the shorter rostrum, and the larger 

 size of the male. It also occasionally attacks man, but is usually 

 confused with the previously mentioned species. 



[The synonyms of this species are as follow : Ixodes antiunnalis, 

 Leach, 1815; /. erinacei, Audouin, 1832; /. reduvins, Atidouin, 1832; 

 /. crenulatus, Koch; /. erinaceus, Murray, 1877; /. riciiuis, Megnin, 

 1880. Two other synonyms are given above by Braun. 



[The female when fully replete is n mm. long, when fasting 

 3-86 mm. ; the shield is heart-shaped and punctate, body finely hairy ; 

 palpi short and broad ; labium shorter, and tarsi of all the legs more 

 truncate than in I. ricinus. The colour of the distended body is 

 drab and somewhat waxy ; rostrum, shield and legs light testaceous. 

 The male varies from 3-5 to 4-0 mm. long, and is reddish-brown 

 in colour with lighter legs; the shield is punctate and leaves a 

 narrow margin around the body; the body is elliptical, almost as 

 large in front as behind. There is a spine on the coxae of the first 

 pair of legs, which is shorter than in the male /. riciiuis and longer 

 than in the female. The genital orifice is opposite the interval 

 between the second and third pair of legs. The fasting nymph is 

 1*76 mm. long, light bluish-grey, margined and transparent, with 

 four large posterior intestinal marks joined together behind the 

 shield and smaller ones extending to the front and sides. When 

 fully distended it is uniformly brownish-white ; shield, legs and 

 rostrum pale testaceous. The larva varies from 0*88 mm. when 

 fasting to 176 mm. when gorged. Its body is light, but gradually 

 becomes darker, with similar intestinal marks to rlciniis. 



[This tick is very common, especially on ferrets, stoats and hedge- 

 hogs. It is also found on sheep, cattle, etc. The males do not 

 generally occur in company with the females on the host. Pairing 

 probably takes place on the ground. F. V. T.] 



Genus. Amblyomma, Koch. 

 Amblyomma cayennense, Koch, 1844. 



Syn. : Amblyomma mixtum, Koch, 1844 ; Ixodes herrerce, Duges, 1887 ; 

 Amblyomma scidptum, Berlese, 1888. 



Characterized by the possession of eyes. The male measures 

 3*8 mm. in length by 3 mm. in breadth ; the female 4 mm. in length 

 by 3 mm. in breadth, but when full of blood may become 13 mm. 



1 Neumann, G. L., "Rev. de la fam. des Ixodides," /// Mem. Soc. Zool. France, 1899, 

 xii, p. 129. 



