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. l. The bristle on the penultimate segment of the legs arises from near the middle; no suture between the cephalothorax and abdomen. The species, some of which occur in the United States, feed on dried fruit, etc. _Carpoglyphus_ Robin. ll. The bristle on the penultimate segment of the legs arise from near the tip; a suture between cephalothorax and abdomen. m. Cephalothorax with four distinct and long bristles in a transverse row; tarsi I and II about twice as long as the preceding segment (fig. 150 f). TYROGLYPHUS Latr. n. Some bristles on tarsi I and II near middle, distinctly spine-like; the sense hair about its length from the base of the segment. Several species in the United States belong to this group. nn. No spine-like bristles near the middle of the tarsi; sense hair not its length from the base of the segment. o. Of the terminal abdominal bristles, only two are about as long as the abdomen; leg I of the male greatly thickened and with a spine at apex of the femur below. T. FARINÆ. oo. Of the terminal abdominal bristles at least six or more are very long, nearly as long as the body. p. Bristles of the body distinctly plumose or pectinate; tarsi very long. T. LONGIOR.