22 A KEVISION OF THE TYROGLYPHID^. 



of the body; and on the venter (PL VI, fig. 56) behind anus are four 

 subequal bristles in a transverse row; the leg III of male is like that 

 of IV and not thickened in the many males examined b}^ me. 



Length 0.65 to 0.80 mm. 



This species differs from R. Jiyachithl in several minute points, 

 namely: the longer tarsi, especially hind tarsi; the position and size of 

 certain bristles, and the proportionately larger front legs. 



Specimens have been studied from Missoula, Mont., on roots of 

 apple trees; from Missouri, under a cottonwood stump, and on onions, 

 from Glenellen, Cal. 



Hhizoglyphus elongatus n. sp. (PL VI. fig. 53). 



Cephalothorax with a pair of long frontal bristles, and a pair of 

 posterior bristles, barely longer than the others, no intermediate bristles 

 visible; a humeral bristle each side no longer than cephalic bristles, and 

 six short bristles near tip of abdomen, the superior pair the longest, 

 l)at no longer than frontal bristles. Bod}^ very elongate, more than 

 three times as long as broad, mandibles large. Legs ver}' short and 

 stout; tarsus I (PL VI, fig. 54), l)ut little longer than penultimate joint, 

 a spine above near the sense hair, one below beyond middle, and two 

 near tip, apical bristles short; the bristle from tip of penultimate joint 

 very large and prominent, and longer than tarsus in all legs; hind 

 tarsus but little longer than front ones, and with short apical hairs. 



Length 0.30 to 0.35 mm. 



The only specimens seen were taken from the roots of clover in 

 October. 1879, probably in Missouri. Distinct by elongate body, very 

 short legs, and short posterior bristles of cephalothorax. 



Rhizoglyphus longitarsis n. sp. 



Cephalothorax with a pair of long frontal Inlstles, a pair of very 

 long and large posterior bristles, and a pair of minute intermediate 

 bristles; a long humeral bristle; the female with six bristles near tip 

 of abdomen, none more than one-third the width of body; in the male 

 the bristles are longer, some nearly as long as width of body, and on 

 the venter, behind anus, are four bristles in a transverse row, but the 

 outer pair is very much longer than the inner pair. The legs are 

 rather long; tarsus I (PL VI, tig. 58) about two and one-half times as 

 long as broad, and with a spine close to the sense hair, one below near 

 middle and two others near tip; the apical hairs nearly as long as the 

 joint; the bristle at tip of penultimate joint is longer than the tarsus 

 in all legs, except the hind pair; the hind tarsus (PL VI, fig. 55) is 

 very long and slender, wi^h two spines beyond middle, and the apical 

 hairs about two-thirds the length of the joint. 



Length 0.75 mm. 



I have seen specimens from Emporia, Kans., taken from the rotten 

 bulbs of Caladium esculentum. 



