April, ’18] EWING AND HARTZELL: CHIGGER-MITES 257 
Fig. 10. Some of the more important chigger-mites. A, Metathrombidium poriceps 
(Oudemans), dorsal view; b, Thrombidium striaticeps Oudemans, dorsal view; c, 
Microthrombidium tlalzahuatl (Murray), dorsal view; d, Euthrombidium trigonum 
Hermann, dorsal view; e, right palpus from above; /, tarsus I of .left leg; g , tarsus 
II of left leg; h , tarsus III of right leg; i, Thrombidium muscarum Riley, dorsal view; 
j , ventral view of mouth-parts. Figures a, b, c, and d after Oudemans. Remaining 
figures drawn from nature by Hartzell. 
