TICKS. ' 203 



CASE affect persons who have been passing through woods, although 

 not often seen or found on trees or plants." 



Cuvier, after noting that " they are found in thick woods, abound- 

 ing in brushwood, briars, etc., states that they attach themselves to 

 low plants by the two fore-legs, extending the other feet so as to 

 seize anything that brushes against them, and their claws being 

 provided with caruncles that act as suckers, the slightest touch is 

 sufficient to give them a hold. Besides fastening upon dogs, cows, 

 horses, and other quadrupeds, they even lay hold of the tortoise, 

 burying their suckers so completely in its flesh, that they can 

 hardly be detached by force and by tearing away the portion of 

 skin to which they are fastened. They deposit a prodigious 

 number of eggs." 



Prof. Busk incidentally mentions that the specimens that he 

 received of his species came in a letter from Rio Janeiro, which 

 had been sixty or seventy days on the way, and that the insects 

 were still living — a fact more in favour of their being likely to be 

 exposed to long privation before they find a victim, than of their 

 being bred on it with food constantly at their mouth. 



los. Amblyoaima pacificum {Murr, n. s.). — 29. Enlarged figure of ditto; 

 ' 3* 30. Specimen (i). 



This species came from the Sandwich Islands. It has con- 

 siderable resemblance to the Carapato of Brazil, but the scutellum 

 has only a small part white (the anterior angles), the rest is 

 reddish brown, the same as the rest of the body. About the 

 same size as the last. _ 



Genus Ophiodes [Miirr^. 



The following species, found on snakes, seem to us sufficiently 

 distinct to warrant their separation into a different genus. Their 

 very thin, flat, circular and somewhat transverse form ; their pecu- 

 liar distribution of colour ; and their apparent restriction to snakes, 

 seem to mark them as a distinct and special type. 



