SEVENTEENTH ANNUAL EEPOET. 



385 



Subfamily Rhipicephalin^. 



4. Dorsal surface of capitulum hexagonal, the sides being 



drawn out laterally into a sharp point; anal plates present 



on male; eyes present 5. 



Dorsal surface of capitulum rectangular, sides straight; 

 male without anal plates; eyes present or absent {Anopli 

 Canestrini, 1890, p. 491) 6. 



5. Second and third palpal articles straight^ not draion o%ut lat- 



erally into sharp points; stigmata comma-shaped 



MhijnGephalus^ p. 415. 

 Second and third palpal articles drawn out laterally into 



sharp points; stigmata nearly round Boophilus^ p. 419. 



6. CoxGB I not hidentate; coxcb IY of normal size; eyes absent . 



Hcemaphysalis, p. 456. 

 Coxae I bidentate in both sexes; coxse IV much larger than 



I to III; eyes present Dermacentor, p. 447. 



Subfamily Ixodin^e. 



7. Anal groove surrounds anus anteriorly and opens poster- 



iorly; eyes absent 8. 



Anal groove surrounds anus posteriorly and opens an- 

 teriorly^ 9. 



8. Palpi valvate on median surface, in both sexes Ixodes^ p. 459» 



Palpi claviform, not valvate in male; legs very long. . 



Eschatocephalus^ p. 468. 



9. Eyes absent; anal plates absent l Aponomma, p. 469. 



Eyes present 10. 



10. Anal plates absent Amblyomma^ p. 470. 



Anal plates present on males Hyalomma^ p. 477. 



TICKS OF THE UNITED STATES THUS FAR REPORTED FOR CATTLE. 



' Thus far the following eight species of ticks have been reported for 

 cattle in this country, and it is these forms in particular which stock 

 inspectors should hold in mind: 



Argas miniatus^ the Southern chicken tick, has been reported from 

 cattle but once. (See p. 402.) 



Ornithodoros Megnini^ the ear tick, is more or less common, especi- 

 ally in the Southwest. (See p. 408.) 



Boophilus annulatus^ the North American Texas fever tick, is very 

 common below the Texas fever line. (See p. 420.) 



Dermacentor reticulatus^ the net tick, is reported for California, 

 Texas, New Mexico, and Indian Territory; it probably has a much 

 more extensive distribution. (See p. 448.) 



Dermacentor electus^ the American dog tick, has a very wide range 

 on this continent, being found both North and South. (See p. 455.) 



11359—01 25 



