New Californian Mites 
NATHAN BANKS 
The following new specias form part of an interesting collection 
of mites recently sent by Dr. Hilton for determination: 
Trombidium perscabrum n. sp. 
Red. Body about one and one-half times as long as broad, sub- 
pyriform, broadest at humeri, broadly rounded behind. Cephalo- 
thorax very short, with crista reaching almost to the hind margin 
and there enlarged, and with a long fine hair arising from each 
sensilla. Eyes near lateral margin on a very short elevation. Body 
clothed with short, capitate hairs with roughened tips, some near 
the eyes are longer than the others. Among these capitate hairs are 
tufts of shorter spine-like hairs. Legs also clothed with similar, 
but mostly more clavate than capitate hairs, roughened on sides 
and end; some of the apical joints beneath have more slender hairs, 
and tarsus I. has them only on the base above, elsewhere with long, 
fine hairs. Leg IV. is about as long as the body, the last joint as 
long as the penultimate; leg I. plainly shorter than the body, tarsus 
I. fusiform, longer than the penultimate joint and about twice as 
broad. Palpi rather stout, basal joints with clavate hairs above, 
below with simple or pectinate hairs, and similar hairs on the fourth 
joint. Thumb as long as third and fourth joints together, cylin- 
drical, rather longer than the claw. 
Length, 1.4 mm. 
From Claremont, California, January. 
Differs from T. scabrum in having the clavate hairs on legs and 
palpi, and in the cylindrical thumb. 
Erythreus posticatus n. sp. 
Body dark (probably red in life), legs pale. Body about one 
and two-thirds times as long as broad, broadly rounded behind, as 
broad at hind coxa as at humeri; cephalothorax narrowed in front, 
crista short, swollen at hind end, one eye spot each side. Body and 
legs clothed with simple hairs, not very densely, and about as long 
