MARGAROPUS, RHIPICEPHALUS, SPECIES OF ARGAS 505 



Dermacentor variabilis, Say. 



The American dog tick has also been found on man, but it is of 

 little economic importance as it is easily removed from its host. 



Genus. Margaropus, Karsch. 

 Margaropus annulatus australis, Fuller. 



The so-called Australian cattle tick. Newstead : reports this as a 

 great pest to man in Jamaica in its larval stage. Its chief hosts are 

 cattle, horses, goats, sheep, dogs and rabbits. 



Margaropus microplus, Canestrini. 



Recorded by Aragao (Mem. lust. Oswaldo Cruz, 1911, iii, fasc. 2, 

 p. 163) as occurring in larval stage on man in Brazil. 



Genus. Rhipicephalus, Koch. 

 Rhipicephalus sanguineus, Latreille, 1804. 



Syn.: Ixodes sanguineus, Latr., 1804; /. rufus, Koch, 1844 ; Rhipicephalus limbatus, 

 Koch, 1844 '> Rh. siculus, Koch, 1844 ; Rh, stigmaticus, Gerstacker, 1873. 

 Spread over almost the entire tropical and sub-tropical regions, 

 occurring in Europe in the South of France and in Italy ; it infests 

 dogs and more rarely sheep ; oxen, cats, foxes and human beings 

 are also attacked. 2 



NEUMANN'S TABLE OF SPECIES OF ARGAS. 



j Body elliptical (sides curved) 2. 



i Body oblong (sides straight), ending anteriorly in a point ... 7. 



j Body transversely oval vespertilionis. 



Body elongate oval 3. 



Margin of body striated ... ... ... ... ... ... 4. 



Margin of body formed by quadrangular areolae PERSICUS. 



{Body flat, integument plainly wrinkled ... ... ... 5. 



Body tumid, elongate ; integument finely wrinkled ; coxae of 



fourth pair of legs near anterior third of body ... ... hennanii. 



( Body oval, narrowed anteriorly REFLEXUS. 



5 { Body elliptical, blunt, hardly narrowed anteriorly 6. 



f Body twice as long as broad ... ... ... ... ... cucumerinus. 



\ Body hardly longer than broad transgariepinus. 



Dorsal integument with large polygonal depressions ; tarsi 



appearing bifid BRUMPTII. 



Dorsal integument almost smooth ; tarsi not appearing 



bifid ... ... ... ... ... ... ... ... (Equalis. 



The Argantince are distinguished from the Ixodince by the head, which in 

 the former is situated on the inferior aspect of the ' cephalothorax, while 

 in the Ixodince it projects freely ; also by the very short proboscis, the small 

 club-like palpi, the lack of suckers on the legs, as well as by the scutellum, which 

 covers the entire back and is bent up round the borders. Two genera are dis- 

 tinguished : Argas, Latreille, 1796 (Rhynchoprion, Hermann, 1804), and Ornithodorus, 

 Koch, 1844. The species live on mammals, but more especially on birds. 



1 Ann. Trap. Med. and Par., 1909, iii, No. 4. 2 Neumann, G. L., loc. cit., 1897, p. 385. 



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