No. 461] NORTH AMERICAN INVERTEBRATES. 309 
7. Cephalothorax with a transverse furrow in the middle ; abdomen usually 
produced above behind, no chitinous pieces at base; u I net than 
Copkidolhorax B adis ihe ordinary dorsal groove or impression ; 
abdomen not prolonged behind ý 9. 
8. Abdomen very long and slender, vérmior . ; ; “Atain, 
Abdomen much shorter Argyrodes. 
9. On that part of the RER that deiade the cephalothorax there is 
a chitinous curved piece each side, in the female not prominent, in the 
male much more so (they form a stridulating organ); colulus present. 
Leg I usually but little longer than IV; femur I rarely more than one and 
one fourth length of cephalothorax’; leg IV usually longer than II . 1o. 
No such pieces on base of abdomen, colulus absent ; leg I much longer 
than 1V, which is often shorter than II; femur I u: one and one 
half to twice the length of cephalothorax ve ag: 
10. Sternum broadly truncate between coxa IV; saisi species 
Crustulina. 
Sternum pointed behind ; coxa IV closer together 
11. S. E. slightly, but distinctly separate, lower eye-row nearly straight ; 
P. M. E. not large, and rather widely separate . Lithyphantes. 
S. E. contiguous . 12. 
12. P. M. E. plainly larger dan K M. E. 3 j abdoingi not black, with two 
yellow spots . A SUPE 
P. M. E. not Ir ia‘ M. E. : : : : ; se P a 
13. Leg IV a little longer than I, all short ; . Pedanostethus. 
Leg 1V plainly shorter than 1, both long and desde À . Teutana, 
14. A. M. E. much larger than A. S. E.; leg I longer than IV . Steatoda. 
A. M. E. not larger than A. S. E. 
15. Leg IV plainly longer than I; sternum granit i i / Asia. 
Leg I a trifle longer than IV . 16. 
16. Femur I not one and one fourth as liri as cione | idol 
Enoplognatha. 
rather depressed . 
Femur I nearly twice as kk as cephalothorax abdomen more slender, 
and in male, constricted near middle Coleosoma. 
17. Sternum truncate between hind coxe ; aria dae with few or no 
teeth ; leg I not much longer than IV : 18. 
Samen pointed behind; hind coxa more re ws claws 
pectinate ; abdomen usually globose ; leg I often much longer than IV 
a3: 
18. No shields or sigille on ipe iN i ; ; ; ; ; T9: 
Shields or sigilla on abdom 21. 
19. Abdomen globose ; ehe short and high, narrow in front 20. 
Abdomen elongate ; cephalothorax broad in front ; legs banded 
Ceratinops.! 
1 Ceratinops, new genus for Ceratinella annulipes Banks. 
