No. 461] NORTH AMERICAN INVERTEBRATES. 301 
S. E. closer to each other than are the M. E. pesa eel or if low, 
then cephalothorax is not unusually broad . 
31. Eyes plainly in three groups of two each ; dived species . 32; 
Eyes in two groups of three each, or else all in one group; small, pale 
Dictynide. 
species 33 
32. A pair of sine rem behind lung in anterior d igi and 
heavy, never small species . Dysderidæ. 
No such stigmata ; legs siai spines, ondi sali palpus at tip of 
tarsus, lip united to sternum . Scytodide. 
33. Cephalothorax broad and flat; lee long ii cone; none of femora 
thickened, mandibles small . . Pholcide. 
Cephalothorax more elongate, not flat; nini: of normalsize 34. 
34. Legs with spines, and not slender; no cribellum ; male palpus partly 
covered by tarsus, dark species : Agalenidz. 
Legs without spines, or else very dened asnally visit and pale species 
35. Female with cribellum and calamistrum ; male has palpal organ partly 
covered by tarsus; no shields on abdomen, legs without spines 
ictynide. 
Female without cribellum or calamistrum ; male has palpal organ at 
tip of tarsus, wholly exposed . 6. 
36. Cephalothorax highest in front i miiie; ieg I long and stouter j iban 
others; three claws to each tarsus . Leptonetide. 
Cephalothorax highest behind middle: : femora IV ee at base ; 
two claws to each tarsus i : i Oónopidz. 
THERAPHOSIDE. 
Palpus arising from the outer basal side of the maxillz Atypinz. 
Palpus arising from near or at tip of maxille — .  . Theraphosine. 
Atypine. 
We have but one genus, Atypus, which is rare in the eastern States, 
with apparently two species. They live in silken tubes which extend some 
distance above the ground. 
Theraphosine. 
ı. Tarsi with a third claw; no tuft or fascicle of hairs attip - C x 
Tarsi with but two claws, a fascicle of hairs at ti 
2. Post-abdomen some distance nn spinnerets ; doii groove ing 
tudinal ; furrow of mandibles indistin 
Post-abdomen just above se dorsal groove transverse or 
es furrow of mandibles distinct - : 3 
