GENUS TYROGLYPHUS LATREILLE. 13 



Glyciphagus robustus n. sp. (PL I, lig". 1.) 



Body .short iuid ])road, rather broader behind middle than else- 

 where, broadly rounded behind. Dorsum with many large, rounded 

 granules, irregularly arranged. A submedian pair of long, sparsely 

 plumose bristles on front margin; a still larger pair near the hind mar- 

 gin of the cephalothorax, as near to side as to middle; one bristle in 

 each posterior corner, and two shorter submarginal ones each side in 

 front of the last. Abdomen with about six pairs of long, discal, plu- 

 mose bristles, the subbasal pair not nearly as long as the others; and 

 six submarginal bristles each side, the two on the posterior margin not 

 nearly as long as the others. Legs rather short, but the tarsi are 

 slender; tarsi I and II twice as long- as preceding joint; tarsus IV 

 more than three times as long as preceding" joint; all with scattered, 

 simple hairs, a longer hair near tip of third and fourth joints of legs 

 I and II. Venter rather finely granulate; the large, broad genital 

 aperture occupies all the space between cox^ II, III, and IV, but 

 does not extend forward between coxa? I. 



Length, 0.24 nmi. 



Specimens from Leetonia, Ohio, in a lot of seeds, from Mr. H. E. 

 Wolfgang. 



Genus TYROGLYPHUS Latreille. 



A suture between cephalothorax and abdomen; mandibles chelate; 

 tarsi with distinct claws; cuticle without granulations; ventral aper- 

 tures small; four distinct posterior bristles on the cephalothorax; tarsi 

 rather slender, in some species with spines; male with anal suckers; 

 in some cases there is a dimorphic male, or the anterior legs of male 

 may be thickened. 



Type. — T. slro L. 



Oudemans uses the name Acarus for this genus, but I think the 

 application is strained and that Michael is right in this matter. I 

 include in TyroglyphuK the g-enus AJeurohius^ which is based on a male 

 character of not more than specific value. 



There are doubtless a number of species in the United States. From 

 the materials at hand I separate the following nine species: 



Table of the Species. 



1. Some bristles on tarsi I and II near middle are distinctly spine-like; the 



sense-hair about its length from base of jpint 2 



No spine-like bristles near middle of tarsi; sense-hair not its length from base 

 of joint 4 



2. Hind tarsi with two long hairs, one as long as the joint terminulis. 



Hind tarsi without such long hairs 3 



3. Male with third legs enlarged Jieteroinorphns. 



Male without enlarged third legs armipes. 



