, 
TEXAS FEVER 331 
experimentally demonstrate that so far as known the cattle tick 
(Bodphilus annulatus)* is the sole carrier of the parasite.t In Ger- 
many and Finland it is said to be transmitted by Ixodes reduvius; in 
Africa, Rhipicephalus decoloratus, R. appendiculatus and R. evertsi; 
and in Australia by R. Australis. It was pointed out by them that 
when southern cattle were freed from ticks they would not when kept 
together in small enclosures transfer the disease to susceptible ani- 
mals, but that when susceptible cattle became infested with the ticks 
Fic. 80. PHOTOGRAPH OF ANIMAL SICK WITH TEXAS FEVER. 
(Photographed by Connaway) 
either by grazing in infested pastures or by having placed upon them 
young ticks hatched in the laboratory the disease appeared. 
The infection of northern cattle with Texas fever by southern 
*This tick was first described by C. V. Riley in 1868 as Ixodes bovis. Later, Cooper 
Curtice investigated this parasite (Biology of the Cattle Tick, Journ. Comp. Med. and 
Veterinary Archives, July, 1891, Jan., 1892) and gave it the generic name of Bodphilus 
(ox loving). This seems to be the only genus of cattle ticks which transmits the para- 
site of Texas fever. Recently Karsch’s genus Margaropus has been proposed as the 
correct name instead of Bodphilus. 
{Crawley has recently found what appears to be a parasitic protozon in the smears 
made from female cattle ticks and from crushed eggs which they had deposited. He 
believes it to be a stage in the life history of P. bigeminum. The Journal of Parasitol- 
ogy, Vol. II (1915), p. 87. 
