SEVENTEENTH ANNUAL REPORT. 



As is seen from this brief, purely differential description, it is not possible to con- 

 fuse the Turicatas with the Garrapatas. It seems that these latter are less noxious; 

 at least it is easier to make them loose their hold, and 

 to prevent their leaving the capitulum in the wound; 

 frequently oil is suffi- 

 cient to make them drop 

 off. 



Neumann exam- 

 ined a number of 

 specimens collected 



FiG.106.— Dorsal view 

 of resting stage be- 

 tween hexapod and 

 octopod forms. 

 Greatly enlarged. 

 Original. 



Fig. 104.— Tarsus I of same 

 side view. Original. 



Fig. 



in Mexico by Duges, bas- 

 ing a detailed description 

 upon them. This description seems to agree in essen- 

 tial characters with the forms we find in the United 

 States. Neumann calls attention to the fact that the nymph is better 

 armed than the adult and ma}^ grow to be as large. He states that 

 he would hesitate to consider these two forms as 

 belonging to the same species had he not found a cast 



nymph skin around a fe- 

 male. We have repeatedly 

 followed this transforma- 

 tion on specimens sent to 

 us, and can confirm beyond 

 question the statement that 

 the nymph and the adult 

 are very dissimilar. 



Judging from letters re- 

 ceived by this Bureau, the 

 ear tick is accused of caus- 

 ing a variety of troubles. Some correspond- 

 ents report sickness and even death among 

 cattle as having been caused by the parasite, 

 while others are not inclined to attach so 

 much importance to its presence. 



Owing to their position in the ear, it is not possible to use any very 



Fig. 107.— Ventral 

 view of same. 

 Greatly enlarged. 

 Original. 



Fig. 108.— Outline of another speci 

 men of same. Greatly enlarged 

 Original. 



