76 PARASITOLOGY. 
tus. The dorsal shield is slightly smaller, and is 
light in color; the palpi are short. In the male the 
dorsal shield covers the entire dorsal surface. The 
free extremity of the leg is provided with two hook- 
lets and a fan-shaped organ, instead of the globule 
shaped apparatus, as in the species Annulatus. 
Condition Produced.—They carry the protozoa pro- 
ducing fever as Bodphilus Annulatus does in the 
United States. 
DerMAceNnTOR Evectus (Derma—skin ; kentes‘s—puncture). 
Synonyms.—Dog tick; wood tick; Dermacentor 
Americanus. 
History.—Very common in the woods of the United 
States. 
Animal, lnfested.—Dog, horse, ox, ete. 
Description.—The engorged female is about the 
size of the fever tick, though the legs are longer and 
Fig. 29-—A4MBLYOMMA AMERICANUM Larva. rch stcmicrograph £X2/3 
inch. 
a, Mandioles. c, Body. 
b, Legs. d, Palpi. 
