Bul. 106, Bureau of Entomology, U. S. Dept. of Agriculture. PLATE XV. 
THE AMERICAN DOG TICK, DERMACENTOR VARIABILIS. 
Fig. 1.—Unengorged larva. Fig. 2.—Unengorged nymph (balsam mount). Fig. 3.—Engorged nymph 
about to molt to female. Fig. 4—Engorged nymph about to molt to male. Fig. 5.—Male, dorsal 
view (Texas form). Fig. 6.—Unengorged female, dorsal view. Fig. 7—Male, dorsal view (Oregon 
form). Fig. 8—Unengorged female, ventral view. Fig. 9.—Male, ventral view. Fig. 10.—En- 
gorged female, dorsal view. Fig. 11.—Engorged female, ventral view. (Original.) 
