EHIZOGLYPHOS RHIZOPHAGUS N. SP. 21 



Rhizoglyphus hyacinthi Boisd. (PI. V, lig". 4H.) 



Cephalotborax Avith a pair of frontal bristles, and a pair of large 

 and long posterior bristles (intermediate bristles not visible); a rather 

 long humeral bristle; a submedian pair of short bristles on the dorsum, 

 one on each posterior side and six near the tip, all short, the longest 

 scarcely one-half the width of body. Legs short and stout, the tarsus I 

 (PI. V, fig, -±8, at right) but little longer than preceding joint, the 

 spine above is close to the sense hair, and the apical hairs are longer 

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

 tarsus in all except the hind legs; the hind tarsus (PL V, fig. 48, at 

 left) is about twice as long as broad, with two spines below near mid- 

 dle, the usual apical spines, and the apical hairs are longer than the 

 joint. In the male there are six hairs near tip of abdomen above, some 

 nearly as long as width of body, and below are four rather long, sub- 

 equal bristles in a straight transverse row; in the dimorphic male leg 

 111 (PI. V, fig. -IT) is enormously thickened, and ends in a stout claw, 

 with a stout tooth at inner base. In color it is white with brownish 

 head and legs, and a dark spot on each posterior side of the abdomen. 



Length, 0.55 to 0.75 mm. 



Specimens have been taken from the bulbs of Bermuda lilies shipped 

 to this country. 



Under the name of R. echlnopus Megn. several European authors 

 ha\e gathered various species; whether this form, which seems partial 

 to bulbs, is the same as Megnin's species I can not tell from descrip- 

 tions; however, I think it identical with the R. echinopus of Michael. 

 Its ravages in various bulbs and orchids have given it the name of 

 "bulb mite" and "Eucharis mite," The damage caused by it to 

 Bermuda lilies has been treated by Mr, A. F. Woods in 1897, in a 

 paper entitled "Bermuda lil}^ disease." (See bibliography, p. 27.) 

 The R. megninl of Haller appears to be a distinct species, with plainly 

 shorter bristles, 

 Rhizoglyphus rhizophagus n. sp. (PL VI, fig. 50.) 



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

 posterior bristles (no intermediate bristles visible); a humeral bristle 

 fully one-half the width of bod}^, two on each posterior side and six 

 at tip in the female, all short, the longest about one-half the width of 

 the body, and a submedian pair above on dorsum. Legs short, the 

 anterior pairs very heav^y, the tarsi I (PL VI, fig. 51) and II with a 

 spine above near the sensory hair; and one below, rather before the 

 middle; apical hairs longer than the joint; the bristle from penulti- 

 mate joint longer than the tarsus in all legs, except the hind pair; 

 hind tarsus (PL VI, fig. 52) two and one-half to three times as long as 

 broad, two spines below near middle, and the usual spines at apex; 

 the apical hairs as long as the joint. In the male the abdomen has 

 eight bristles near tip, one pair rather more than one-half the width 



