330 
Genus Argas 
Eyes absent. Rostrum, which is concealed by 
cephalo-thorax, is situated at least its own length 
behind the anterior margin. No projecting head. 
Body oval or elliptical, flat or hollow dorsally, with 
fine granulations. The edges with a lateral ridge 
with different markings from those on rest of dorsal 
surface. No groove behind the anus. 
(1) A. miniatus .—Body oval, margin formed of 
rectangular festoons. Dorsal submarginal granulations 
contiguous. The American fowl tick. 
Pathogenicity. —Transmits Sp. gallinarum in S. 
America. 
(2) A .« persicus. —For its injurious effects famous 
to travellers from Persia to Pekin. A poultry pest in 
S. Africa. 
Genus Caris 
Body almost as wide as long. Has a conspicuous 
transverse groove behind the anus, differing from 
Argas in this respect. 
(1) C. vespertilionis. —Parasitic on bats. 
LITERATURE 
( a ) Neumann’s Monographs are indispensable for the identifica¬ 
tion of ticks. 
Mem. Soc. Zool. de France, t. IX, 1896, pp. 1-44; t. X, 1897, 
pp. 324-420 • t. XII, 1899, pp. 107-294 ; t. XIV, 1901, pp. 249-372 ; 
the last containing tables of all the genera and species. 
Archives de Parasitologie, 1902-1907. 
Annals of Tropical Medicine and Parasitology , Vol. I, No. I, 1907. 
(b) Salmon and Stiles. Cattle Ticks of the United States, 
XVIIth Annual Report, 1900, Department of Agriculture. An 
excellent summary, costing a few shillings only. 
(1 c ) Donitz, W. Die wirtschaftlich wichtigen Zecken mit 
besonderer Beriicksichtigung Afrikas. 
