32 



3 mm. when fasting, to lo mm. long by 6"5o mm. wide when fully 

 distended. It lays its eggs on herbage and attacks sheep, goats, 

 cattle, and deer. 



/. hexagoHHS, another British species, is found on stoats, ferrets, 

 and hedgehogs, and /. tenuirosti-is, a smaller species, on voles. 



Ceratixodes is a new genus with one species only — C. pictus. The 

 female (PI. IX, fig. 6) was described by Cambridge in 1879 as 

 Ixodes pictus, Hyalomma puta, and Ixodes borealis (Kramer and 

 Neumann). The male (PI. IX, fig. ^) I. Jii?ibriati/s {K.x. and Nn.) 

 was then identified by Neumann to be the consort of /. pictus, 

 and it may be remembered that I was instrumental in establishing 

 the identity of the two species in 1902, specimens of which I 

 exhibited at a meeting of the Society. Neumann subsequently 

 described this male under a new genus — Ceratixodes. Mr. Hewett, 

 of York, found the specimens on cliffs frequented by guillemots. 

 The male is certainly the most remarkable of the British ticks, on 

 account of the extreme sexual dimorphism exhibited. The marginal 

 brushes at the posterior end of the abdomen are found only in the 

 male (PI. X, fig. 6). 



Of Eschatocephaliis seven species are described. E. vespertilionis 

 has been found in Britain and is widely distributed on the Continent. 



OS. Apotioiiwia \yN&\s& species are described, but none as British. 



Amblyomma has eighty-six species, but none British. A. hebrceufn, 

 the South African " bout " or variegated tick, is the carrier of " heart- 

 water" in sheep and goats, and is said to lay as many as 17,000 

 eggs. 



Hyalomma has three species described by Neumann, one of which 

 {syriacicni) I took from a tortoise and exhibited at a meeting of the 

 Society in 1899. H. egyptiioii, the "striped-leg" or "bout-leg" 

 tick, is found at the Cape. It has about thirty synonyms, and is 

 probably known all over Africa and the greater part of Asia. 



Of the group Rhipicephalce the genus Rhipicephalus has twenty- 

 three species, mostly African. They are identified with tick and 

 Texas fever ; the species decoloratics is the " blue tick " and evertsi 

 the " red tick." Siimcs and appendiculatus convey East Coast fever. 



Hamaphysalis has twenty-two species. H. putictata has been 

 taken in England on a hedgehog. Dermacentor has seventeen 

 species ; one species, reticulatus, is British, and found occasionally on 

 sheep. The specimens exhibited came from Mr. Pocock, of Revel- 

 stoke, Devon. It is probably an imported species. 



The Amblyomma, Hyalomma, Rhipicephalus, and Dermacentor are 

 genera in which eyes are present. 



In the pairing of the sexes there is considerable doubt as to the 

 method of copulation in ticks, but most observers agree that insertion 

 of the mouth organs of the male into the orifice of the female takes 

 place at the time of coition. Mr. R. T. Lewis, at the Quekett Club 

 in 1900, communicated some interesting observations he had made 

 as to the existence of two organs at the base of the hypostome in 



