JOURNAL OF ENTOMOLOGY AND ZOOLOGY isis) 
the whole length of the cephalo-thorax. Lamellar hairs short, 
curved, and situated on the anterior ends of the lamelle about 
one-half the distance from the base of the same to their upper 
edges. Interlamellar hairs absent. Pseudostigmatic organs 
long, lanee-shaped and slightly recurved. Abdomen globular, 
nude. Pteromorphe rigid, extending forward almost to the 
tip of the cephalo-thorax, notched at their tips. Ventral plate 
as broad as long, shield-shape. Genital opening at the anterior 
margin of ventral plate; as broad as long, and situated about 
twice its length in front of the anal opening; genital covers 
triangular. Anal opening much larger than genital opening 
and situated about one-half its width from the posterior margin 
of ventral plate; anal covers rectangular; twice as long as broad. 
Legs moderate; posterior pair not reaching as far as the pos- 
terior margin of the abdomen. Total length of body, 0.86 mm.; 
width, 0.60 mm. 
From the top of Mt. Chintimini, Oregon; under a rotting log; 
by the writer. 
Described from four specimens. I can find no individual vari- 
ations in any of them. 
Family HOPLODERMID At 
Genus Phthiracarus Perty. 
Phthiracarus maximus n. sp. 
(Fig. 6) 
A large dark brown species. Integument granular, of medium 
thickness. Cephalo-thorax about two-thirds as high as long, and 
bearing dorsally three pairs of large bristles. The posterior pair 
of bristles is about as long as the cephalo-thorax itself; the 
middle pair is slightly shorter; the anterior pair is slightly 
shorter than the middle pair. Pseudostigmata circular, shallow; 
in diameter about equal to the width of femur of one of the legs. 
Pseudostigmatice organ small, stoutly setiform. Abdomen about 
one-half as high as long, and bearing several prominent bristles, 
including five dorsal pairs. Posterior end of abdomen pointed. 
Genital covers about two-thirds as long as anal covers. Each of 
