64 Trans. Acad. Sci. of St. Lowis. 
Macrocheles clavisetosus n. Sp. 
Pl. IX. f. 17-18. 
Light yellowish brown; integument granular. 
Palpi one-half as long as the anterior pair of legs; distal segment 
less than the penultimate segment in length and bearing a tuft of hairs 
on its distal end; antepenultimate segment slightly longer than the 
penultimate; the second segment has its inner margin concave. Mandi- 
bles broader than the palpi; chele almost equal to the last two segments 
in length; hypostoma in the form of two long spurs, Wigs teing forward 
about one-half the length of the palpi. 
Body about two-thirds as broad as long; markedly compressed in front 
of the second pair of legs and very broadly rounded behind. Dorsally 
the body is very sparsely clothed with rather stout spatulate hairs. 
Anterior pair of legs longer than the body; tarsus and tibia of leg I 
subequal; tibia longer than the antepenultimate segment. Leg II 
enlarged, about three times as wide as leg I. The tarsi of the three 
last pairs of legs show segmentations near the base. Claws and caruncles 
stout. All the legs sparsely clothed with two kinds of hairs; near their 
bases the clavate hairs predominate while toward the distal ends only 
simple, pointed sete are found. 
Length, 0.90 mm.; breadth, 0.58 mm. 
Quite common under logs and in trash. I have speci- 
mens from Galesburg, Arcola and Urbana, III. 
Macrocheles muscorum N, Sp. 
PtOEX fF. 79. 
Very light brown; chele of mandibles dark brown. 
Palpi one-half as long as the first pair of legs; distal segment longer 
than the penultimate - segment; antepenultimate segment longer than the 
penultimate. Mandibles when extended equal to the palpi; chele as 
long as the last three segments of the palpus. Hypostoma in the form 
of two long harpoons and over one-half as long as the mandibles. 
Body two-thirds as broad as long, rounded behind, truncate in front, 
slightly compressed at the level of the second pair of legs and very 
sparsely clothed with slightly curved hairs; hairs longer toward the 
posterior margin. 
Anterior pair of legs as long as the body; distal segment one and a 
half times as long as the penultimate segment and well provided with 
hairs; penultimate and antepenultimate segments subequal; second pair 
of legs twice as stout as the first pair; third pair of legs the shortest 
pair; last pair of legs next to the longest. The last three pairs of legs 
possess stout caruncles. 
Length, 0.46 mm.; breadth, 0.30 mm. 
In moss. Collected by L. M. Smith at Parker, III. 
LAELAPS Koch. 
Peritreme present, more than twice as long as broad; leg I with 
claws; dorsal shield entire; male genital opening on the anterior rene 
of the sternal plate, male with leg II unarmed. 
Three species. 
