12 A KEVISION OF THE TYROGLYPHID^. 



rather thickened, hairs; tarsus 1 (Fl. I, tig. 4) nearly four times as 

 long- as broad, with sense hair at extreme base, a spine slightly beyond 

 and one near middle below, apical hair about one-half as long as joint; 

 tarsus IV (PI. I, fig. 6) four times as long as penultimate joint, w4th a 

 spine above near base and one below near middle, apical hair not 

 prominent. 



Length, 0.20 mm. 



Taken at Washington, D. C, in decaying matter, together with a 

 species of Rhizoglyjihix. 



Genus GLYCIPHAGUS Hering. 



Cuticle of body more or less granulate; claws very small and incon- 

 spicuous; some of the hairs of body plumose, or formed into foli- 

 aceous scales; the ventral apertures are very large and occupy all the 

 space between the coxpb; mandibles chelate, usually with a suture 

 between cephalothorax and abdomen; male without anal suckers; 

 female with the bursa copulatrix projecting slightly at tip of the 

 abdomen. 



Type. — G. domesticus De Geer. 



This genus is abundantly represented in pAirope, but in this country 

 1 have seen but few species or specimens. The genus should form a 

 tribe or subfamily in the Tyroglyphidie on account of its wide diver- 

 gence in structure from the tyi)ical Tyr<MiJyphux. These mites have 

 been found feeding on all sorts of substances, but the name indicates 

 that thev iire the true "sugar mites,'"' and cause the disease known as 

 "grocer's itch." Two species are known to me. 

 Glyciphagus obesus n. sp. (PI. I, fig. 8.) 



Body about one and one-half times longer than broad, parallel- 

 sided; pointed in front, broadl}- rounded l)ehind. Dorsum with scat- 

 tered, irregular granules. Cephalothorax with four pairs of short, 

 simple bristles; two pairs in front, a submedian pair behind, and one 

 in each posterior corner; and a short, broad hair or scale neju- margin 

 over coxa^ II. Abdomen with a submedian pair of plumose bristles 

 on basal third, a pair of simple ])ristles nearer to margin on pos- 

 terior third; three siniple l)ristles each side, and five each side at and 

 near the tip, the outer one the longest. Legs rather short and stout, 

 I (PL I, fig. 2) and II with a curved, pliunose bristle near base of 

 third joint and near middle of fourth joint, the latter joint with a 

 long, simple bristle at tip; tarsi I and II one and one-half times longer 

 than preceding joint, tarsi III and IV twice as long as preceding joint. 

 Venter minutely granulate, genital aperture (PI. I, fig. 5) occupying 

 all the space between coxffi and mouth parts. 



Length, 0.33 to 0.38 mm. 



Taken from a necktie that had been for some time in a drawer, at 

 Berkeley, Cal. (E. J. Wickson.) 



