
No. 461] NORTH AMERICAN INVERTEBRATES. 315 
3. Cephalothorax as broad as long; abdomen broader than lon 
E 
Gasteracantha. 
Cephalothorax and abdomen longer than broad . Acrosoma. 
4. Cephalothorax bearing spines or tubercles . j à cive 
Cephalothorax without spines or tubercles . $. 
5. Posterior eye-row strongly procurved ; metatarsus pss tarsus 1 plainly 
longer than tibia plus patella I ; cephalothorax rather flat j 
Posterior eye-row barely, if at all, procurved . ; : ; Jy 
6. A. M. E. nearer to each other than to A. S. E., large species 
Argiope. 
A. M. E. as near to A. S. E. as to each other; small species Gea. 
7. All metatarsi longer than tibia plus patella; abdomen subcylindric ; 
maxille longer than broad; S. E. separate by fully two diameters ; legs 
often with bands of erect hair . . Nephila. 
Metatarsi shorter than tibia pita yeiellas pedis. "n in fore legs; 
when so, then maxille shorter than broad, S. E. approximate, and no 
bands of erect hair on legs 8. 
8. Hind femora with a fringe of coc iib at bins ibdomés babicylin- 
dric; S. E. approximate; P. M. E. only about twice as far from P. S. E. 
as from each other; legs very slender and with only a few slender spines 
Leucauge. 
Hind femora without such fringe of erect, curving hairs at base 9. 
9. Cephalothorax much elevated behind, sloping forward to re 10. 
ephalothorax not prominently elevated behind . Il. 
10. Legs with long spines; P. M. E. less than diameter pet: no tüber- 
cles on abdomen  . . Mangora. 
Legs without spines, or very Dm ones ; P. M. E. fully two diameters 
apart; abdomen with tubercles Carepalxis. 
nn. omen with a median hump or cone at india as wal as lateral pro- 
jections ; sternum rather long; clypeus high . à : . Plectana. 
Abdomen without median together with lateral projections . CO. 
12. S. E. separated by fully diameter and on separate tubercles = 44. 
S. E. contiguous or nearly so, at least upon the same eminence . 14. 
13. P. M. E. small and close together; mandibles slender 
Dolichognatha. 
P. M. E. equal to others and widely separate . Azilia. 
14. P. M. E. scarcely more than one and a half Möhieter apiri, and as 
close to the P. S. E. as to each other ; S. E. — separate ; all y 
subequal in size ; epigynum without a finger . 
P. 
M. E. much closer to each other than to P. S. E : "4 
15. Tarsus IV with many serrated bristles beneath; di spider with 
globose abdomen . Theridiosoma. 
Tarsus IV RER re bieten biu larger species ; een 
not globose , 
