YUCCA MOTH AND YUCCA POLLINATION. 155 
Fig. 2.—a, longitudinal section of pistil of Yucca jila- 
mentosa showing (6, 6) punctures of Pronuba, and (c, c) 
the normal position of her eggs in the ovarian cell —X11; 
d, section of a punctured carpel 7 days after oviposition 
showing the egg yet unhatched and the manner in which the 
ovules in the neighborhood of puncture have been arrested 
in development so as to cause the constriction —X2; e, sec- 
tion of an older carpel showing the larva above the original 
puncture—xX2; /, a seed 13 days from oviposition showing 
young larva at funicular base—X8. 
PLATE 36. 
Fig. 1.— Transverse section of one of the carpels of pistil, 
after the flower has opened: a, ovule; 5, funiculus; ¢, 
placenta; d, ovarian cell; e, fibro-vascular bundles; /, 
fibro-vascular tissue ; g, primary dissepiment. 
Fig. 2.— Transverse section of pistil about middle, one 
day after oviposition, showing (a, a) puncture of oviposi- 
tor, and (6, 6) position of egg —X17. 
PLATE 37. 
Fig. 1.— A, tip of anal joint and vaginal projection of 9 
Pronuba yuccasella from side showing ovipositor with 
parts extended: 0, basal part; ¢, its file-like surface; d, ter- 
minal part with its dorsal serrate wing (/), its dentate tip 
(e), its ventral membranous outlet (g) and the extended 
oviduct (2); B, the same parts further enlarged; C, ven- 
tral view of tip of abdomen showing the two pair of rods 
i, i and k, & with their muscular attachments, the parts of 
ovipositor similarly lettered as in A; m, m, eggs taken 
from Yucca pistil; x, egg showing development of embryo ; 
o, mature egg from ovary of 9; 7, 8, genital claspers of 3, 
lateral and dorsal views —all enlarged, the pedicels of eggs 
not sufficiently slender. 
Fig. 2. — Flower of Yucca with near petals removed to 
show normal position of Pronuba in ovipositing. 
