310 THE AMERICAN NATURALIST. (VoL. XXXIX. 
20. Tibia I not as long as cephalothorax ; "o THU very broad ; male 
eyes elevate Microdipoena. 
Tibia I longer shan cephalotorax dich is more mat than pre- 
ceding . : ; : : Mysmena. 
21. Abdomen with skied across AN : : ; : . Idionella. 
Shield not across base ; 24. 
22. Abdomen of both sexes with asia didit: aae viti hori fron eye- 
region ; no stiff bristles under femur I . istiagonia. 
Abdomen of female without dorsal shield, pnl Kt; male without 
frontal horn; a row of stiff bristles under femur 1. . Ancylorrhanis. 
23. Anterior eye-row procurved ; tibia of male palpus large; nn with 
abdomen swollen in middle each side Theridula. 
Anterior eye-row straight or RN tibia of tial palpus not 
enlarged ; female not with swollen sides 3 : x Theridium. 
LINYPHIIDA. 
1. Cave spiders ; no claw at tip of pens of female . ; : eT 
Not cave spiders ; ‘ x cota 
2. Without eyes ; sternum e : . i 7 ; . Antrobia. 
With eyes . : UR T 
3. P. M. E. about as ug BM to P. S E. as to pars nies yt M. E. barely 
diameter apart . Phanetta. 
P. M. E. much coser to b du other thao to P. S. E; A. M. E. several 
diameters apart . _ Troglohyphantes. 
4. No claw to tarsus * femads "aue ; epigynum without a finger or hook ; 
male palpus with a tibial apophysis, a but one spine above on tibia 
IV : (Erigoninz) 16. 
Kd to pinu. in deside ; epigynum with a finger or hook ; male 
palpus without a tibial apophysis, although sometimes enlarged or a tooth 
at tip; usually two spines or erect bristles above on tibia IV 
(Linyphine) 5. 
5. Legs without spines ; mandibles long, and their lower anterior border 
provided with several long, slender teeth; A. M. E. larger than P. M. E. 
Tapinopa. 
Legs with at least a few spines, or not agreeing with above 6. 
6. Mandibles long, slender, divergent, in front with 3 pairs of long spines, 
abdomen depressed and rather broad; P. M. E. less than diameter apart 
Drapetisca. 
Mandibles without the 3 pairs of spines in front 5 
7. Tibiz without lateral spines: metatarsus I not longer ihan tibia I; 
usually small spiders 
Tibiæ with lateral spines ; metatarsus I usually as dong as, often longer 
than, tibia 1; larger spiders . : : 7 
