LUCY WRIGHT SMITH 
445 
c. A narrow cleft between the lobes of the tenth tergite, large, oval horny 
areas on either side; on the ninth tergite a median rounded projection 
pointing anteriorly proteus 
cc. A wide cleft between the lobes of the tenth tergite; small oval areas 
on either side; no projection on the ninth tergite biloba 
F emales 
a. Eighth ventral segment without conspicuous median processes or teeth, 
b. Posterior margin straight (or nearly so) or triangularly produced, 
c. Posterior margin straight (or nearly so) with or without a small incision. 
d. Without any incision dorsata 
dd. With a small rectangular incision nobilis 
cc. Posterior margin triangularly produced comstocki 
aa. Eighth ventral segment with a conspicuous pair of tooth- or spine-like 
processes. 
b. With a pair of broad tooth-like or somewhat triangular processes, 
c. The entire segment not modified in the formation of the processes, 
d. Processes arise before the posterior margin of the segment. 
e. Processes about as long as wide at base, inner margins straight, 
outer oblique; distance between the processes at their base, less than 
their breadth at base calif ornica 
ee. Processes considerably longer than broad; inner margins straight 
or slightly concave, outer, oblique or a trifle convex; distance between 
processes at base, about equal to their breadth at base . . . princeps 
cc. The entire segment modified in the formation of the processes. En- 
tire segment cleft, anterior part of each half prolonged into a process 
with inner margin concave and outer convex. Processes reach nearly 
across segment nine biloba 
bb. With a pair of median spine-like processes. 
c. Processes arise in posterior half of segment, extend half way across 
segment nine proteus 
N^'lliphs 
a. No lateral, apical hooks on abdominal segments. Supra-antennal plate 
blunt or ending in sharp tooth, and angles of prothorax produced laterally, 
c. Supra-antennal plate blunt, and lateral prothoracic teeth short, dorsata 
cc. Supra-antennal plate ending in a sharp tooth and lateral prothoracic 
teeth long callfornlca 
aa. Lateral, apical hooks on abdominal segments, one to eight. Hooks close 
to body or standing well out from it. 
b. Hooks close to body, inconspicuous on segments seven and eight. 
proteus 
bb. Hooks well out from body, those on the seventh and eighth segments 
as conspicuous as the preceding ones biloba 
TRANS. AM. ENT. SOC., XLIII. 
