Jan. 18, 1925 
Scale Insects of the Subfamily Ortheziinae 
143 
was described from two of the larger 
islands of Japan and was recorded as 
occurring on wild chrysantheum (Com- 
positae) and Artemisia vulgaris (Com- 
positae). 
SUBGENUS ARCTORTHEZIA COCKERELL 
Reference. —Cockerell, 1902, En¬ 
tomologist 35: 114, 259. (As a section.) 
The structural and other characters 
of this subgenus agree with those given 
in the generic diagnosis, except for the 
differences already emphasized in the 
key to the subgenera. The subgenus 
includes two well known species, one 
of which, as indicated by the map 
accompanying the discussion of it, has 
a holarctic distribution, 
while the other is thus far 
known only from the West¬ 
ern States and mostly, but 
not entirely, from rather 
high altitudes. 
The host relationships of 
the two included species, 
so far as they are known, 
do not appear to possess 
particular significance. 
The two species placed 
here may be separated by 
the following key: 
KEY TO SPECIES OF THE 
SUBGENUS ARCTORTHEZIA 
a. Median # triangular 
spine groups rela¬ 
tively large, extend¬ 
ing the full depth 
of the segment bear¬ 
ing each and com¬ 
pletely isolating the 
two halves of the 
dorsal spine band on 
each; correspond¬ 
ing dorsal secre¬ 
tionary plates of 
perfect insect large, 
distinctly overlapp¬ 
ing each other or the 
following segment_ 
- occidentals Douglas. 
aa. Median triangular spine groups 
much smaller, extending over 
only about the anterior half of 
the depth of the segment bear¬ 
ing each and not isolating the 
halves of the dorsal band; corre¬ 
sponding secretionary plates of 
the perfect insect small, not 
reaching the following segment 
in any cas e-.cataphrada (Shaw^). 
ORTHEZIA CATAPHRACTA (SHAW) 
Figs. 3, E; 6, N; 7, P; 36 and 37; PI. 2, I 
Reference. —Shaw, 1794, Na¬ 
turalist’s Miscellany 5: 182. 
Synonyms. — Dorthezia chiton Zet- 
terstedt, Orthezia signoreti F. B. White, 
and Orthezia uva Blanchard (see 
Fernald, 1903, Cat. Cocc. World, p. 33). 
Adult female. —Broad oval, taper¬ 
ing somewhat anteriorly, size variable, 
length with secretion about 3.5 mil¬ 
limeters, width 2.5 to 3 millimeters; 
completely covered dorsally and vent- 
rally with heavy plates of white secre¬ 
tion, except at the insertions of the 
appendages; ovisac short and broad, 
parallel-sided, extending about 1.5 to 2 
millimeters beyond apex of body; 
dorsal wax plates complete, each half 
with 10 visible marginal plates, includ¬ 
ing the fused anterior median one, and 
9 visible median transverse plates, all 
paired except the posterior one, these 
occupying most of the dorsal area; 
differing noticeably from the other 
members ‘ of the genus, except oc¬ 
cidentals, in the possession of 3 
unevenly diamond-shaped or triangular 
wedges of secretion along the middle 
line, one on each half of the last 2 
thoracic and the first abdominal seg¬ 
ments; body without secretion averag¬ 
ing 2 to 2.5 millimeters in length and 
1.5 to 2 millimeters in width; stout 
oval, posterior end broadly rounded, 
anterior end somewhat tapering; derm 
membranous, except for appendages 
and a slightly chitinized thickening 
ventrally on each side of the genital 
opening; antennae normally 8-seg- 
