
No. 461] NORTH AMERICAN INVERTEBRATES. 393 
UROCTEIDE. 
We have but one genus in this country, Thalamia Hentz, with two 
species in the South. 
LEPTONETIDE. 
1. The six eyes in two groups, four in a row in front, and two behind 
Leptoneta. 
Thesix eyes in three groups of two each, two in the middle and two 
each side 
: : C 2 
2. S. E. form a diverging tius, and uch by their side i . Usofia. 
S. E. touch at one point, and form a single opening within 
Ochyrocera. 
OÖNOPIDE. 
Abdomen soft, globose E o : Orchestina. 
Abdomen with corneous ide doigt i : Gamasomorpha. 
SCYTODIDE. 
1. With eight eyes ; body dark . - ‘ . ; -  Plectreurys. 
With but six eyes š a 
2. Cephalothorax elevated behind; eye- ona widely itpaitalij three claws 
to each tarsus ; palpus of female with a claw at tip . . Scytodes. 
Cephalothorax not elevated behind; eye-groups more approximate ; 
palpus of female without claw at ti a 
3. Three claws to each tarsus ; anterior evexow nen inde; cephao 
thorax very slender Di 
Two claws to each tarsus ; anterior eyerow anak: opto 
broader : : : : ; Loxosceles. 
Fic. 6.— Cephalothorax of Scytodes. 
PHOLCIDE. 
1. With six eyes situated rather close together upon a prominent eminence 
Modisimus. 
2 
Eyes not on an eminence, and in two groups 
