Ewing — New North American Acarina. 65 
KEY TO SPECIES. 
1. Body hairless L. magnichela. 
Body sparsely clothed with simple hairs 2. 
2. Anterior pair of legs very slender, not as broad as the others 
L. mandibularis. 
Anterior pair of legs about as stout as the rest L. flavus. 
Laelaps magnichela N. Sp. 
Pl Xe F260. 
Chestnut brown; body darker than the appendages. 
Palpi one-half as long as the anterior pair of legs; distal segment of 
palpus very small and short, as broad as long; penultimate segment 
slightly shorter than the antepenultimate; mandibles when extended 
equal to the palpi in length. 
Body fully two-thirds as broad as long, somewhat egg-shaped in 
appearance. Peritreme straight, extending beyond the third pair of 
legs. Body hairless. 
First pair of legs about as long as the ‘body; tarsus of the first pair 
about one and a half times as long as the tibia; tibia and antepenulti- 
mate segment equal in length, but the tibia is somewhat the narrower 
of the two. Second pair of legs slightly the stoutest; tarsus of leg II 
one and a half times as long as the tibia; tarsus of leg III shorter 
than the tarsus of leg II. Tarsi of all the legs sparsely clothed with 
rather stout hairs. Claws of the tarsi moderate, situated on short 
pedicels. 
Length, 0.64 mm.; breadth, 0.44 mm. 
In moss. Collected by the writer at Muncie, Ill. 
Described from four specimens. 
Laelaps mandibularis n. sp. 
Bic A Oe RE 
Yellowish brown, legs and mouth parts paler. 
Palpi less than one-half as long as the anterior pair of legs; distal 
segment small, about one-half as broad and one-half as long as the penul- 
timate segment; antepenultimate segment longer than the penultimate 
segment. Mandibles when extended twice as long as the palpi and 
apparently jointed near the middle; chele equal to the last two segments 
of the palpus in length. 
Body egg-shaped, broadest at the level of the last pair of legs, sparsely 
clothed with simple hairs. 
Anterior pair of legs about one and a half times as long as the body; 
tarsus one and a half times as long as the tibia and well clothed with 
hairs; tibia and antepenultimate segment subequal; second pair of 
legs stoutest and subequal to the third pair. Caruncles of the legs stout. 
All the legs sparsely clothed with hairs. 
Length, 0.52 mm.; breadth, 0.42 mm. 
Habitat unknown. Collected by the writer several years 
ago at Arcola, Ill. Described from two specimens, both of 
which were excellently well preserved. 
