136 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
the genital covers bears a row of small genital spines near its 
inner margin. Anal covers each bearing a few prominent sete. 
Legs stout, almost equal; the anterior pair, however, is slightly 
the largest; tarsus of leg I one and a half times as long as tibia, 
tibia shghtly longer than genual. Ungues stout, one-half as long 
as the tarsi from which they spring. Total length of the body, 
2.00 mm.; height, 0.98 mm. 
Figure 6. Phthiracarus maximus n. sp.; side view. 
From Corvallis, Oregon; under an old piece of wood which was 
lying on damp ground; by the writer. 
Described from three specimens. This species is at once 
separated from all others of the genus by its large size. 
