392 QUEENSLAND AGRICULTURAL JOURNAL. [1 May, 1899. 
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Diagrams of Posterior Ventral Margins of Males.—(1) Of annulatus, (2) of caudatus, (3) of 
australis, and (4) of decoloratus, showing ad-anal shields and “‘tails.? (1 and 2 after Neumann ; 
3 and 4 original.) 
From the differences in the various characters, brought out in the above 
tables, I have felt myself justified in re-establishing Koch’s 2. decoloratus, and 
in regarding the Australian tick as a new species. The following - brief: 
descriptions will, I think, suffice for the recognition of australis and 
decoloratus :— J 
Rhicephalus decoloratus, Koch. (‘‘ Uebersicht des Arachnidensystems,” 
page 134.) . 
Female: When replete, 10-12 mm. in length, and 6-8 mm. in breadth. 
Colour uniform, slate-blue. Shield of the same form as that of annulatus and 
australis, but smaller; furrows at first converging, then diverging to the 
posterior lateral margins ; median region of a light-yellow colour, laterals red. 
Eyes not distinct. Labium with six rows of teeth. Mandibles with lesser 
process bi-cuspid, and presenting a rounded process as well. Legs generally 
yellowish, often red. 
Male, adult: Pale-brown and almost transparent, sometimes dark-brown, 
Length, 2-8 mm. Labium with six rows of teeth. Ad-anal shields four, of 
the usual form but more chitinous than those of annulatus, and prolonged 
into strong conical points. Abdomen ending in a strong chitinous caudal 
appendage. 
Hab.: On horses, cattle, &e. Cape of Good Hope. 
Lhipicephalus australis, n.sp. 
Female: When replete, measuring 10-11 mm. in length and 6-7 mm. in 
breadth. Dorsal shield smaller than that of annulatus and greater than that 
of decoloratus, of the same form and with similar furrows. Byes, pale. Labium 
with eight rows of teeth, Mandibles with the lesser process tri-cuspid, and 
presenting a rounded process as well. 
- Maie, adult: Approaching that of annulatus, but with ad-anal shields more 
chitinous, and also exhibiting a caudal appendage. Neither the shields nor 
the “tail” are so pronounced as those of decoloratus. 
Hab.: On horses, cattle, &e. North-west to north-east Australia. 
Mr. Fuller also says :—‘“ For some time now there appears to haye been 
doubt as to the identity of the Redwater Ticks of Australia and North 
America with one another and also with the supposed carrier of Redwater in 
