g. Genital suckers usually present; integument usually without fine parallel lines.
h. Legs short, without clavate hair on tarsi I and II. On insects. Canestrinidæ.
hh. Legs longer, with a clavate hair on tarsi I and II. Not normally parasitic except on bees. Tyroglyphidæ
i. Dorsal integument more or less granulate; claws very weak, almost invisible; some hairs of the body plainly feathered; ventral apertures large. Glyciphagus Her.
This genus occurs in the United States. In Europe the mites have been found feeding on all sorts of substances. They are known as sugar mites and cause the disease known as grocer's itch. G. domesticus and G. prunorum are old world species ([fig. 150, d]).
ii. Dorsal integument not granulate; claws distinct; no prominent feathered hairs; ventral aperture small.
j. Mandibles not chelate; elongate, and toothed below; body without long hairs; palpi enlarged at tip and provided with two divergent bristles. Species feed on decaying substances. Histiostoma Kram.
jj. Mandibles chelate; palpi not enlarged at the tip, nor with two bristles.
k. No clavate hair on the base of tarsi I and II; no suture between cephalothorax and abdomen. Live on bees or in their nests. Trichotarsus Can.
kk. A clavate or thickened hair at the base of tarsi I and II.