yoo 



ARTHROPODA 



thirty-first day. Thus, in this case the larva and nymph remain 

 parasitic on the host, and do not drop off as described above. 



Parasitic on Man. — The ticks known to be parasitic on man 



are: — (i) Argas reflexus Fabricius; 

 (2) A. persicus Oken; (3) Orni-. 

 thodoros savignyi Audouin; (4) 

 0. mouhata Murray; (5) 0. megnini 

 Duges; (6) 0. turicata Duges; (7) 

 0. tholozani Laboulbene and Megnin; 

 (8) Alectorobius talaje Guerin-Mene- 

 ville; (9) Eurhipicephalus sanguineus 

 Latreille; (10) Mar gar opus annulatus 

 Say; (11) Rhipicentor hicornis Nut- 

 tall and Warburton; (12) Dermacen- 

 tor reticulatus Fabricius; (13) D. an- 

 dersoni Stiles; (14) D. electus Koch; 

 (15) D. wo^^^ste Banks; (16) Ixodes 

 ricinus Linnaeus; (17) /. hexagonus 

 Leach; (18) Amhlyomma americanum 

 Koch; (19) A. dissimile Koch; 

 (20) Hyalomma agyptium Linnaeus. 



Pathogenicity. — Ticks are spreaders 

 of disease in man and animals. 

 They may be classified into spreaders of SpirochcetidcB, spreaders 

 oi Babesia, and into spreaders of unknown germs. 



Fig. 319. — Fully replete Fe- 

 male OF Hcsmaphysalis punc- 

 tata C. AND F. 



(After Nuttall, Cooper, and 

 Robinson, Journal of Parasitol- 

 ogy-) 



{a) Magnified ; {b) natural size. 



1. Spreaders of Spirochaetidae. 



1. Ornithodoros mouhata carries Spiroschaudinnia duttoni Novy 

 and Knapp, 1906, and causes African tick fever or Button's 

 relapsing fever in man. 



2. Argas persicus carries Spiroschaudinnia marchouxi Nuttall, 



3. Mar gar opus annulatus carries Spiroschaudinnia theileri 

 Laveran, 1904. 



2. Spreaders of Piroplasma. 



1. Eurhipicephalus appendiculatus cdiYries P. higeminum. 



2. E. simus — P. higeminum. 



3. E. evertsi — P. equi. 



4. E. sanguineus — P. canis. 



5. E. hursa — P. ovis. 



6. Mar gar opus annulatus — P. annuldtum. 



7. Hcemaphysalis leachi — P. canis. 



3. Spreaders of Unknown Germs. 



I. Argas persicus causes a disease in Persia. 2. Dermacentor 

 venustus (see D. andersoni) causes Rocky Mountain fever. 

 Experimentally, the nymphs of D. marginatus and Amhlyomma 



