Plate II.— Margaropus annulatus: 1, Front foot, showing single spur; la, Supposed 

 sense organs; 2, Hind foot, showing double spur; 3, Head of female; 4, 4a, 4b, 4o, Female 

 ticks, natural size, shown at different stages of feeding; 5, Egg; 6, Larval or "seed tick; 

 7 Dorsal surface of the mouth parts of female— a, mandible; b, labrum; c, palpus; d, 

 mouth ring- e, spots covered with papillse; 8, Labium and mandibles; 8a, PapUls enlarged; 

 9 Mandible-X-Busk's organ, use unknown ; 10, Mouth parts of young tick. (After Osborn, 

 from Curtice; BuU. No. 5, Bureau of Entomology, U. S. Dept. of Agr.). 



