JUNIPER SCALE-INSECTS. 
915 
14. The juniper scale insect. 
Dia8pis carueli Targ. Tozz. 
This scale insect is said by Professor Comstock to be very common 
at Washington, D. 0., on various species of juniper and allied plants. 
Its numbers are reduced by a chalcid parasite, Aphelinus mytilaspidis 
Le Baron. The following account is by Comstock, and is copied from 
the U. S. Agricultural Keport for 1880 : 
Scale of female. — The scale of the female is circular, snowy white, with the exuviae 
central or nearly so, naked, and yellow. Diameter of scale, 1 to 1.5 mm (.04 to .06 
inch). Figs. 2, 2a, 26. 
Female. — The females are yellow, circular in outline, a little elongated posteriorly. 
The last segment of the body presents the following characters : 
The anterior group of spinnerets consists of about eight, the anterior laterals of 
from ten to sixteen, and the posterior laterals of about eight. 
There are four lobes which are nearly in a straight line, the end of the body being 
truncate. These lobes are quite small, rounded posteriorly and are equidistant from 
each other. The second lobe of each side 
is deeply incised, but the lateral lobule is 
very small and in many cases concealed by 
the margin of the segment. 
Each lateral margin of the segment is 
divided into three subequal, more or less 
distinct lobes, each lobe ends posteriorly 
in one or two lobules, each of which bears 
an elongated pore on its dorsal surface. 
The plates are short and in some cases 
subtruncate at extremities; they are sit- 
uated as follows : two between median 
lobes; two inconspicuous ones laterad of 
first lobe of each side; two laterad of 
second lobe ; usually one on the anterior 
part of the first lobe of the lateral margin; 
one or two near the middle of the second 
lobe of the lateral margin, and two or 
three on the third or anterior lobe of the 
lateral margin. 
The spines on the dorsal surface are sit- 
uated as follows : one upon the first lobe 
near its lateral margin ; one on lateral 
lobule of the second lobe ; and one a short 
distance mesad of the mesal plate of each 
of the three lobes of the lateral margin. 
On the ventral surface the spine accom- 
panying the first and second lobes of each 
side are obsolete. There is one at the base 
of the plate of the first lobe of the lateral 
margin ; one between the plates of the second lobe, and one near the middle of the 
third or anterior lobe of the lateral margin. 
Scale of male. — The male scale is white and very small, being only l mm (.04 inch) 
in length; it is elongated, with a prominent median ridge; the larval skin is naked 
and light yellow in color. See Fig. 2b. 
an M 
Fig. 303.— The juniper scale-insect.— From 
Comstock. 
