AMBLYOMMA CAYENNENSE 367 



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 o - 88 mm, when 

 fasting to 1*76 mm. when gorged. Its body is light, but gradually 

 becomes darker, with similar intestinal marks to ricinus. 



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

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

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

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



Amblyomma cayennense, Koch, 1844. 



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

 Amblyomma sculptum, Berlese, 1888. 



Characterised 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. 

 in length and n mm. in breadth. They are common in the 

 whole of Central America (Garrapatas), and attack mammals, 

 amphibious animals and man. 1 



Hyalomma cegyptium (L.), 1758. 

 Syn. : Acarus cegyptius, L., 1758 ; Ixodes camelinus, Fischer, 1823. 



A species frequently found in Africa, particularly in Egypt 

 and Algeria, and which also occurs in France and Italy, as well 

 as in Asia. Male 8 mm. in length, 4-5 mm. in breadth. Female 

 up to 24 mm. in length and 15 mm. in breadth. It infests large 

 and small animals as well as human beings. 2 



[This is one of the largest ticks, nearly reaching the size of the 

 Bont tick. It is known in Africa as the Bont leg-tick ; all farm 

 stock is attacked, but sheep and goats suffer most. Only one 

 generation appears to occur each year. The male is almost black 

 with a pale marginal stripe ; the replete female brown with 

 irregular light blue stripes. It is abundant in parts of South 

 Africa. F. V. T.] 



1 Neumann, G. L., cf. p. 205. 



2 Neumann, G. L., cf. p. 285 ; Ronsisvalle, " Sui fenomeni morb. prodotti nel uomo 

 da un Jxodide 'denominate Hyol. eeg." (Boll. Ace. Gioenia sc. nat., 1891, xvii.). 



