118 
Journal of Agricultural Research 
Vol. XXX, No. 2 
same; ovisac about 4 to 4.5 millimeters 
long, nearly as wide as the body, nar¬ 
rowed near the posterior apex, com¬ 
posed of a solid dorsal plate with 
lateral keels and longitudinal striations, 
a broad, curved, transversely strongly 
rounded, nearly smooth ventral plate 
and, between these two, 3 more or less 
distinct elongate ribs; body secretion 
dorsally arranged in the usual marginal 
plates, these rather short anteriorly 
but becoming longer, more strongly 
curved, flattened and somewhat pointed 
an appearance rather different from 
that usually found in the genus; length 
of body as mounted normally about 
3.5 millimeters, width about 2.5 to 3 
millimeters, nearly oval, somewhat 
pointed anteriorly; derm membran¬ 
ous; antennae normally 8-segmented, 
lengths of segments of one in microns 
as follows: I, 161; II, 100; III, 150; 
IV, 93; V, 89; VI, 85; VII, 89; VIII, 
186; eyestalk stout, rounded conical, 
somewhat curved; legs apparently not 
unusual for the genus, although no 
Fig. 12 .—Orthezia caudata: Adult female, body, dorsal and ventral; X about 31 
toward the posterior end of the body, 
the penultimate pair from one and a 
half to two times the length of any of 
the others; secretion covering the disk 
of the dorsum, instead of being ar¬ 
ranged in the usual 10 pairs of definite 
and distinct plates, with only the inner 
portion of each of these, plates defi¬ 
nitely formed, the remainder of the 
secretion made up of a number of 
overlapping scalelike plates, producing 
complete examples available for ex¬ 
amination; beak stout conical, 1-seg- 
mented, without indication of a fur¬ 
ther division; thoracic spiracles nor¬ 
mal, the external opening of each sur¬ 
rounded by a collar of spines differing 
distinctly but not conspicuously in 
shape and size from the remaining 
body spines; with 8 pairs of long tubu¬ 
lar, submarginal abdominal spiracles; 
derm pores of the usual quadrilocular 
