236 ENTOMOLOGICAL SOCIETY 



External border of palpi straight. Eyes present 



genus Dermacentor Koch 



External border of palpi drawn out into a projecting point. Eyes 

 wanting 4 



{External border of second joint drawn out into a sharp projecting 

 points at the base genus Rhipistoma Koch 

 External border of second joint drawn out in a more rounded form 

 genus Haemaphysalis Koch 



The new genus Boophilus of which the type species is bovis 

 Riley * is distinguished principally by the peculiar shape of its 

 palpi, which are very short, stand a little apart from the ros 

 trum, and are somewhat zigzag shaped at their external bor 

 der. It is very probable that H&maphysalis rosea Koch, from 

 the West India Islands, and Megnin's Ixodes Diigesii, from 

 Bgypt, of which I possess several males and females, belong 

 to this new genus ; as this latter species does not show any dif 

 ference from bovis Riley it must be considered a synonym of 

 the latter. 



The genus Rhipicephalus is represented in North America by 

 a beautiful species from California and one from Cape Disap 

 pointment, Washington. It seems, however, by the number 

 of species described by Koch, to be principally an inhabitant of 

 Africa. 



Dermacentor is a common form in North America. Peter 

 Kalm and Linneus have described it as americanus from the 

 United States. It occurs everywhere, and I have specimens 

 from Ft. Simmo, Ungava Bay, L/abrador, 58 n L. , and from 

 Sitka, Alaska, and also from the Indian River, Florida It is 

 known here as the dog tick. 



Rhipistoma has so far only been found on the genus L/epus, 

 in North America. It is quite common in Kansas, Texas, and 

 California ; it is also frequently met with in Austria. 



H&maphysalis has not yet been found on the American con 

 tinent ; I have it from France and England. 



Quite a number of other genera have been established by 

 numerous writers : Xypihiastor Murray, Cecidopus Karsch, 

 Adenopleura McAllister, Gonixodes Duges, Phautoixodes Ber- 

 lese, and Gekobia Berlese. 



Some of these genera are synonyms and the others are de 

 scribed so vaguely that it is impossible to recognize them. 



There followed a long, interesting and animated discussion 

 on the laws of zoological nomenclature, having particular ref- 



*See Prof. Gamgee's "Report on Diseases of Cattle," U. S. Depart 

 ment of Agriculture Special Report. 1869. 



