210 



SCHOOL ENTOMOLOGY 



on either side at the front and three grooves toward the rear 

 of the body. 



The adult female when gorged with blood and eggs, drops 



IF 



FIG. 149. The cattle tick (Margcropus annulatus). (U. S. Dept. Agr.) 



3, mature female with eggs; 4, hide covered with ticks; 5, blood cells con- 

 taining Texas fever protozoa; 10, various stages of cattle ticks natural size, except 

 5, which is enlarged 1000 times. 



to the ground and there lays her eggs to the number of 1500 

 to 3000. From these light-brown eggs small larvae or seed 

 ticks hatch in from two to six weeks, depending on tempera- 



