392 
Messrs Nuttall and Warburton, 
On a new genus of Ixodoidea together with a description of 
eleveyi new species of ticks. By George H. F. Nuttall, Sc.D., 
F.R.S., Christ’s College, Quick Professor of Biology, and Cecil 
Warburton, M.A., Christ’s College, Zoologist to the Royal 
Agricultural Society. 
[. Received 28 December, 1907.] 
In the course of the last few years we have received numerous 
specimens of ticks collected in various parts of the world. The 
majority belong to well-known species. In view of the frequently 
inadequate descriptions in the literature relating to ticks a number 
of specimens have not as yet been definitely classed. On the other 
hand we have encountered eleven undescribed species, one of which 
forms the type of a new genus ( Rhipicentor ) : 
List of New Species. 
1. Ixodes cavipalpus ( £ and $ ). 
2. „ kelloggi ( $ ). 
3. Ilaemaphy salts wellingtoni ( g 
and $ ). 
4. Rhipicentor hicornis ( and $ ). 
5. Rhipicephalus coriaceus ( £ and $ ). 
6. Rhipicephalus masseyi ( £ and $ ). 
7. Amhlyomma versicolor ( £ and $ ). 
8. „ atrogenatum ( <$ ). 
9. „ cooperi ( $ and $ ). 
10. „ uncatum ( $ ). 
11. Hyalomma monstrosum ( g ). 
For the sake of brevity and precision we have adopted certain 
signs and terms in our description, these being explained in the 
following table. 
Explanation of terms and signs used in the following diagnoses. 
L. = the extreme length of the tick excluding the capitulum and legs. 
W. = its width at the widest part. 
( l . and w. refer to length and width of various structures.) 
Dorsum = the whole dorsal surface of the body. 
scutum = the “dorsal shield,” “ Kopfschild,” etc. of some authors. (Size 
stated by giving the length first, then the greatest width (including 
the eyes if protruding), thus - 9 x '7 mm.) 
pseudoscutum = that portion of the male scutum which corresponds 
in shape and position with the female scutum, and is sometimes 
outlined by a ridge, punctations or hairs, without being a definite 
structure. 
emarginate means hollowed out for the reception of the capitulum. 
