66 ; Trans. Acad. Sci. of St. Lowis. 
Laelaps flavus Nn. Sp. 
Pl, Xf. S2. 
Yellowish brown; legs paler than the body. 
Palpi about one-half as long as leg I; mandibles stout, chele sub- 
equal. 
Body broad, two-thirds as broad as long; broadly rounded behind and 
somewhat pointed in front. The whole of the dorsal surface of the 
abdomen is chitinized. Peritreme extending beyond the coxe of the 
last pair of legs. Sternum in the case of the female almost as broad as 
long; genital plate of female large, truncate in front. 
Anterior pair of legs about as long as the body; tarsus longer than 
the tibia, truncate at the distal end and bearing a small caruncle on 
its inner distal aspect. Second pair of legs slightly stouter than the 
others; third pair the shortest but stouter than the anterior pair; pos- 
terior pair of legs extending about one-third their length beyond the 
posterior margin of abdomen. Claws of the last three pairs of legs 
rather small and situated on slender pedicels. 
Length, 0.52 mm.; breadth, 0.88 mm. 
Under logs. Collected by the writer at Arcola, Ill. Two 
specimens. 
HYLETASTES Gistl. 
Leg I with claws; dorsal shield entire; male genital opening on the 
anterior margin of sternal plate; leg II of male unarmed; anal plate 
small, separate in both sexes. 
One species. 
Hyletastes missouriensis nN. sp. 
Pl. X. f. 23-24. 
Yellowish brown, integument smooth. 
Palpi about one-half as long as the anterior pair of legs; distal seg- 
ment very small, about one-half as broad and one-half as long as the 
penultimate segment; hypostoma with cusps about half as long as the 
basal segment of the palpus. 
Body oblong, sides almost parallel for most of their length; broadly 
rounded behind and somewhat pointed in front. Dorsum hairless. Anal 
plate triangular with corners rounded and the anterior margin almost a 
straight line; genital plate almost twice as broad as the anal plate. 
Anterior pair of legs almost as long as the body; tarsus about one and 
a half times as long as the tibia, truncate distally, with the caruncle 
arising from the inner side; antepenultimate segment shorter than the 
tibia. Second pair of legs slightly if any enlarged; tarsus of second pair 
of legs one and a half times as long as the tibia; third pair of legs 
shortest; fourth pair extending but slightly beyond the hind margin of 
the body. 
Length, 0.50 mm.; breadth, 0.24 mm. 
Under bark and in trash. Collected by C. R. Crosby at 
Columbia, Mo., and by the writer at Muncie, Il. 
