314 THE AMERICAN NATURALIST. | [Vor. XXXIX. 
ULOBORIDE. 
All eyes subequal in size, cephalothorax more elongate . Uloborus. 
Eyes of posterior row very much larger than those of anterior row, in 
fact the A. S. E. are almost invisible : à i . Hyptiotes. 
EPEIRIDE. 
1. Mandibles large, edd divergent, abdomen and legs more or less 
elongate 1 . Tetragnathine. 
Mandibles eei vi not strongly yet. cde : . Epeirina. 

Fic, 16.— Cephalothorax of Fic. 17.— Epeiridz ; cephalothorax, face, 
Tetragnatha. and spinnerets. 
Tetragnathinie. 
1. Abdomen with a transverse,ventral furrow near middle ; abdomen not 
twice as long as broad  . ; : : : - Gi pe gm 
Abdomen without such hoy 
2. Abdomen not twice (or d as lag as SEEN not inch longs u 
cephalothorax . .  . Pachygnatha. 
Abdomen three or dou times as bug as broad . . vA) 
3. S. E. as close or closer than M. E. ; j . Tetragnatha. 
S. E. farther apart than M. E. . . . i i 
4. Abdomen projecting beyond ipbitiecete: inatail . .  Eucta. 
Abdomen not projecting beyond spinnerets in a distinct tail 
Eugnatha. 
Epetrine. 
1. Abdomen with a horny shield, or at least with sigiflce | "d IV M. 
than I 
Abdomen without shield or us: i IV hona than b (P 
2. Spinnerets enclosed at base by a horny ring; abdomen with spines 3- 
Spinnerets not enclosed by horny ring ; abdomen without, spines 
Cercidia. 
