118 Trans. Acad. Sci. of St. Louis. 
their inner margins; tarsi with tridactyle claws; first tarsus never 
broadened at its end. 
Three species. 
Oribata tessellatala n. sp. 
Very dark chestnut brown. 
Cephalothorax as broad as long. No true lamellae id Aaa but lateral 
thickened areas which extend almost to the tip of the rostrum. Both 
the superior and the antero-lateral bristles apparently absent. 
Abdomen as broad as long, hairless, with a semicircular free margin. 
Pteromorphae large, antero-ventral free margin deeply emarginated. 
The pteromorphae are peculiar in that they show the epidermal cells 
forming a tessellated appearance when viewed from above. Genital 
covers small, rectangular, each twice as long as broad. They are sit- 
uated between the posterior coxae. Anal covers twice as long as the 
genital, situated their length from the latter and one-third their length 
from the posterior margin of the ventral plate, broader toward their 
posterior ends. 
Legs of moderate size. Claws tridactyle, dactyles unequal. 
Length, 0.80 mm.; breadth, 0.45 mm. 
In moss. From Nilgiri Hills. Three specimens. 
Oribata nilgiria n. sp. 
Body dark chestnut brown, pteromorphae and legs much paler. 
Cephalothorax almost as broad as long; no true lamellae present but 
lateral thickened areas which extend forward beyond the middle of the 
cephalothorax. Superior bristles very minute; antero-lateral bristles 
apparently absent. Pseudostigmatic organs with long straight pedicels 
and clavate, pectinate head. 
Abdomen as broad as long, uniformly rounded behind. Pteromorphae 
large, extending forward almost to the tip of the rostrum, showing 
vertical chitinous thickenings. Genital covers short and broad, subrec- 
tangular, two-thirds as broad as long and each with a longitudinal row 
of fine minute hairs, row of hairs down the middle of each cover. 
Anal covers almost twice as long as the genital, situated about their 
length behind the latter and a third their length from the posterior 
margin of the ventral plate. They are broadest at their posterior ends, 
and each has two minute hairs, one at each end. 
Tarsus of leg I longer than the tibia, well clothed with simple 
bristles and each possessing three plumose hairs on their inner mar- 
gins; tibia much broader distally than proximally, with an inner plu- 
mose bristle and an outer very long tactile bristle; genual over twice 
as long as broad and three-fourths as long as tibia, with an inner 
plumose bristle. 
Length, 0.32 mm.; breadth, 0.24 mm. 
In moss. Described from an abundance of live material 
which came from the Nilgiri Hills. 
