172 



Anjstals of the Tka^^s'/aal Museum. 



connection with a species of Dennacentor. A second examination 

 of RJiipice phalli s gladiger brought me definitely to the conclusion 

 that the anal shields were absent. Rhipicephalus is, therefore, no 

 more in question. It is apparently an intermediate form between 

 Rliipiceplialus and Dermaccntor. On the 21st of December I wrote 

 to Mr. Howard that I intended to reunite the two species in a new 

 genus which I proposed to call Rliipicentor . 



It seems that the same thing occurred to Messrs. oN'uttall and 

 Warburton, for, by a rare coincidence, it is the same name chosen 

 by them in a recent work* in which they describe, under the 

 name of Rliipicentor hicornis, the species which I called RJiipicephalus 

 gladiger. At the same time they gave the characters of the new 

 genus which they establish in that paper. The publication of this 

 work of Nuttall and Warburton having preceded my " Notes YI," 

 it is evident that Rliipicentor hicornis must have the preference over 

 Rh ipicentor gladiger. 



A comparison of the two species of the new genus show the 

 following principal differences: — 



Rhipice ntor h icornis . 

 Male. — Base of rostrum, 

 with posterior angles prolonged 

 into a spine. Coxae IV with 

 spines unequal, the inner one 

 almost double the outer one. 



Female . — Dorsal shield 



scarcely longer than wide. Palpi 



short. Coxae lY with spines 

 longer than wide. 



R h ip ice ntor r icinv s . 

 Male. — Base of rostrum, 

 with posterior angles simply 

 projecting. Coxae lY with 

 spines almost equal. 



F e m ale . — Dorsal shield 

 scarcely longer than wide. Palpi 

 long. Coxae lY with spines as. 

 wide as long. 



* Gr. H. F. Nuttall and C. Warburton. On a new genus of Ixodoidea, together with a 

 description of eleven new speciesj of ticks. Proc. of the Cambridge Philosophical Society, voi. 

 XIV. 1907, p. .398. 



