IXODOIDEA 



699 



egg varies from three weeks to three months. The larvae, which are 

 capable of remaining on grass without food for months, must obtain 

 access to cattle, on which they feed, and grow for three days, after 



Fig. 316. — The Larva of Hcemaphysaiis Fig. 317. — The Nymph of Hama-J^ 

 punctata C. and F. (X 40.) physalis punctata C. and F. 



After Nuttall, Cooper, and Robinson, Journal of Parasitology.) 



Fig. 318. — Adult Female of Hcemaphysaiis punctata C. and F. 

 (After Nuttall, Cooper, and Robinson, Journal of Parasitology.) 



which they moult and form nymphs on the sixth day of their para- 

 sitic existence — i.e., without leaving the host. The nymph sucks 

 blood and grows till the eleventh day, and the adult is hatched on the 

 thirteenth to sixteenth day without the nymph leaving the host. 



Pairing takes place on the seventeenth to twentieth day, and the 

 fertilized gorged female drops off the host on the twenty-fourth to 



