672 THE AMERICAN NATURALIST. (Vor. XXXV. 
2. Eye-tubercle arising from anterior — of the cephalothorax; palpi 
shorter than the body . . Sitalces 
Eye-tubercle arising back ie he margin; dM ipe tan body... 3 
3. Tarsus II about twice as long as body, its joints very slender; no eyes 
Phalangodes 
Tarsus II about length of body; eyes often present . . Scotolemon 
SCOTOLEMON Lucas: 
1. Eye-tubercle ends in a spine; second joint of Vise three times as long 
as wide; body with short, stout spines . S. spinifera Pack. (Fla.) 
Eyetibercle without spine ; second joint of T about twice as long 
as broad "UY 
2. Tarsus II with short joints ; ue stouter 
S. flavescens Pack. (Ky., Ind., Va.) 
Tarsus II with joints slender; palpi more slender 
S. californica Bks. (Calif.) 
SCLEROBUNUS Banks : À 
Color red, tips of legs black. . . . S. robustus Pack. (W. States) 
Color brown, tips of legs yellowish .S. órunneus Bks. (Wash., Alaska) 
SITALCES Simon ; `. (005 9c. as Se californica Bka (Ci) 
PHALANGODES Tellkampf. . . . P. armata Tellk. (Mammoth Cave) 
PLAGIOSTETHI. 
Three families occur in the United States: 
. Last joint of palpus with a claw at end, this joint longer than pre- 
ceding one (except in male of Protolophus) . . . PHALANGID/E 
Last joint of palpus much shorter than penultimate, no clawatitstip. 2 
- 
2. Palpi very short, concealed under the projection of eye-tubercle 
TROGULIDE 
Palpi long and prominent. . . . . . . . NEMASTOMATID/E 
Our genera of Phalangidz are separated as below: 
1. Male with palpus enlarged, last joint shorter than penultimate ; female 
with patella of palpus provided with a long branch; palpal claw 
smooth ; a row of teeth on sides of coxe . (Protolophini) Protolophus 
Last joint of Urbe Ex than cene ; aE without an 
in adult 
2. Ga of enormous size, three ae spines on femur of pipe 
CH Caddo 
Eye-tubercle of normal size : x. 
3. A group of spinules on anterior margin of the | copia iod the 
eye-tubercle spinose; palpal claw smooth, rarely if ever with late 
rows of teeth on cox, frequently with spines on femur of palpus 
(Phalangini) 19 
