SEVENTEENTH ANNUAL REPORT. 



417 



Fig. 113.— S tig- 

 men of same. 

 Greatly en- 

 larged. Origi- 

 nal. 



led to this conclusion, not onl}^ because of the fact that the genus 

 Bo(ypUlus is not entirel}^ unjustified, hence a change to Rhipiceph- 

 alus at present might be only temporary, but from a practical stand- 

 point, we prefer not to change a technical name which has become 

 almost vernacular, unless the necessity for such change is clearly 

 indicated. From the fact that some authors consider 

 BoopliUiis as entirel}^ distinct from Rhiinceplialus^ while 

 others consider the two genera congeneric, it is evident 

 that the question is not definitely settled. Of the two 



opinions the one 

 here temporarily 

 adopted has the 

 advantage of co- 

 inciding with the 

 more generally 

 used name, and in 

 matters of public 

 h^^giene, where others besides 

 zoologists are concerned, it is 

 necessary to take this into con- 

 sideration, unless popular ver- 

 nacular is directly contradicted 

 by technical facts. 



Marx (1892) states that "-Rhi- 

 piceplialus is represented in 

 North America b}^ a beautiful 

 species from California, and 

 one from Cape Disappointment, 

 Washington." After the elimi- 

 nation of the Texas fever tick, 

 however, we are not personally 

 acquainted with any North 

 American species of RhijncepJi- 

 aliis. R. mnguineiis is reported 

 b}^ Neumann for Panama, and R. hursa americanns io\ Jamaica. We 

 have specimens of an undetermined RMpicephalus from Porto Rico. 

 The following table of species is given by Neumann: 



Key to the Species of the Genus Rhipicephalus.^ 

 [For forms [Boophilus) reported in the United States, follow Roman type.] 



Females 1 



Males 13 



Nymphs {Fhaulixodes) 23 



^This key does not include the following species: B. javanensis, E. Jlavus, 

 R. bhamensis, R. hsemaphysaloides, R. ruber, R. Linnei. 



Fig. 140.— Dorsal view of male Boophilus austmlis, from 

 Porto Rico, after several generations on cattle at 

 Bethesda, Md. Greatly enlarged. Original. 



