p. Hind part of the male abdomen with two lobes. On a few wild animals. Caparinia Can.
pp. Hind part of the male abdomen without lobes. Live in ears of dogs and cats. Otodectes Canestr.
O. cynotis Hering ([fig. 150 e]) has been taken in the United States.
ee. Palpi usually of four or five segments, free; rarely with ventral suckers near genital or anal openings; eyes often present; tarsi never end in suckers; body usually divided into cephalothorax and abdomen; rod-like epimera rarely visible; adults rarely parasitic.
f. Last segment of the palpi never forms a thumb to the preceding segment; palpi simple, or rarely formed to hold prey; body with but few hairs. EUPODOIDEA.
g. Palpi often geniculate, or else fitted for grasping prey; mandibles large and snout like; cephalothorax with four long bristles above, two in front, two behind; last segment of leg I longer than the preceding segment, often twice as long. Bdellidæ.
gg. Palpi never geniculate ([fig. 158a]), nor fitted for grasping prey: beak small; cephalothorax with bristles in different arrangement; last segment of leg I shorter or but little longer than the preceding joint; eyes when present near posterior border. Eupodidæ
Moniez has described a species from Belgium (Tydeus molestus) which attacks man. It is rose colored; eyeless; its legs are scarcely as long as its body, the hind femur is not thickened; the mandibles are small and the anal opening is on the venter. The female attains a length of about 0.3 mm.
ff. Last segment of the palpus forms a thumb to the preceding, which ends in a claw (with few exceptions); body often with many hairs ([fig. 158 k]). TROMBIDOIDEA.
g. Legs I and II with processes bearing spines; skin with several shields; coxæ contiguous. Cæculidæ.