COCCIDAE OF OHIO. 75 
Remarks: This is undoubtedly a cosmopolitan species and 
has been deseribed under various names in several countries. 
The scale is popularly called the ‘‘Appletree Bark Louse,’’ 
though not confined to apple trees. Perhaps the greatest damage 
is done on Poplars and Willows. In the northeastern part of Ohio 
this scale is plentiful, and in instances many Poplars have been 
killed by its attack. This is a difficult scale to combat, but the 
same measures as used for the San Jose’ Seale will prove suc- 
cessful. 
Genus PARLATORIA Tare. 
The two species which are reported for Ohio are both green- 
house species, or rather in this case P. zizyphus (Lucas) was 
found on oranges and lemons in the Columbus markets. Parla- 
toria pergandii Comst. aifeets Citrus trees most seriously. 
A. Scale of femaie circular pergandii 
AA. Scale of female elongated, black zizyphus 
Parlatoria pergandu Comstock. 
Fig. 24. 
P. pergandii Comst., Rep. U. S. Dep. Ag., 1880, p. 327 (1881). 
P. pergandii Comst., 2nd Rep. Dep. Ent. Corn. Univ., p. 113 (1883). 
Scale of female: Circular to elongated, irregular, dirty-gray, 
1.6mm. in length; exuviae marginal. brown, the first naked and the 
second covered by a thin film of secretion, occupying nearly one-third 
of length of scale. 
Scale of male: Long and narrow, lateral margins prominent, not 
carinated, light gray with terminal exuvia darker. 
Female: Three pairs of well-developed lobes, nearly equal in size, 
broadest near the middle tapering anteriorly, notched deeply on each 
side near the apex. A rudimentary fourth lobe, produced into a 
papilla, half-way between third lobe and penultimate segment. A 
crescent-shaped thickening of the body-wall appears between the 
median lobes, between median and second, second and third, and two 
thickenings between third and fourth lobes and between fourth lobe 
and penultimate segment. The plates are as long as the lobes and 
fringed on the distal margin. Two between median lobes, two between 
median and second, three between second and third, three between 
third and fourth, and three palmate plates cephalad of fourth lobe. 
On the three segments preceeding the last, are five or six plates, each 
produced into a papilla. A spine on the dorsal surface of each lobe 
near the margin; on the ventral surface, the spines are situated laterad 
