April, 1905.] 
A New Aspidiotus. 
325 
Fig. 9. Four tapetal cells, two celled embryo-sac and disintegrating 
megaspores. 
Fig. 10. Two celled embryo-sac beginning to destroy tapetum. 
Fig. 11. Four celled embryo-sac. 
Fig. 12. Eight celled embryo-sac showing antipodals already settled 
in pocket. 
Fig. 13. Egg apparatus, conjugating polar nuclei and antipodals. 
PLATE XX. 
Fig. 14. Stamen showing pollen sacs and pollen grains. 
Fig. 15. Older pollen grain with thickened wall. 
Fig. 16. Polar nuclei and a sperm nucleus. 
Fig. 17. Three nuclei fusing to form definitive nucleus. 
Fig. 18. One celled embryo. 
Fig. 19. Two celled embryo. 
Figs. 20-21. Four celled embryos. 
Figs. 22, 23-24. Older embryos. 
Fig. 25. Flalf grown ovule showing four celled embryo, endosperm 
lining, nucellus and inner integument shrivelling, and outer integument 
developing hard tissue. 
Fig. 26. Flat section of mature seed showing hard integument a-b 
and outline of embryo imbedded in endosperm. 
Fig. 27. Longitudinal section of a mature ovule through a-b showing 
cotyledons and plumule. Endosperm around but not between cotyledons. 
A NEW ASPIDIOTUS FROM AESCULUS GLABRA. 
Harlax H. York. 
Aspidiotus {Dias pidiotus) ohioensis n. sp. Female scale cir- 
cular, slightly convex, margin irregular, 1-2 mm. in diameter, 
dark or dirtv gray, exuviae orange red. sub-central and covered 
with dark excretion. When removed from the bark, the scale 
leaves a conspicuous white patch. 
Female; Median lobes broad, notched on lateral margin near 
apex and sometimes notched near the apex on the mesal margin. 
Second lobes rudimentary, slightly developed on inner-angle, 
often not present. First interlobular incision shallow, broader 
than deep, chitinous processes usually fused into a solid process, 
occasionally furrowed . Second interlobular incision similar to the 
first, only smaller, the chitinous process seldom furrowed. Some- 
times there is a very small incision laterad of the second incision. 
There is usually a small chitinous process at the inner base of 
each median lobe. A simple and a forked plate, sometimes two 
to three forked plates laterad of median lobe, one to three forked 
plates between the first and second incisions and usually one 
simple and one to three forked plates laterad of second incision. 
Spines prominent, longer than the plates. On the dorsal surface, 
one spine at the base of the outer margin of each median lobe, 
one on each of the rudimentary lobes, one about one-third of the 
distance from the median lobe to penultimate segment and one 
about the same distance from the penultimate segment. The 
spines on the ventral surface are shorter than those of the dorsal 
