122 
Journal of Agricultural Research 
Vol. XXX, No. 2 
numerous over the ventral surface, 
most of these with rather wide outer 
walls surrounding the loculi, the maxi¬ 
mum and minimum diameters varying 
to a marked degree, the largest nearly 
twice the size of the smallest; body 
with setae scattered sparingly over 
most of the surface, but with a distinct 
and rather prominent transverse cluster 
of slender setae occurring ventrally just 
anterior to the genital opening; spines 
arranged in the usual 11 marginal and 
10 dorsal clusters on each half of the 
besides the disk pores already men¬ 
tioned, 4 narrow transverse bands of 
scattered spines extending almost to 
the ovisac band at each end; anal ring 
elongate oval, the outer margin sinuate 
opposite the insertions of the 6 ring 
setae, with numerous pores, the inner 
margin of pore row distinctly but not 
prominently angulate anteriorly and 
posteriorly. 
This species has been redescribed 
from the following material: Dripping 
Springs, Organ Mountains, N. Mex., 
on Garry a wrightii (Cornaceae), 
coll. T. D. A. Cockerell (type). 
Only one additional record has 
been made, the species having 
been identified by Cockerell 
from material collected at 
Grand Canyon, Ariz., on Fend- 
lera (Hydrangeaceae) by E. 
Bethel. 
ORTHEZIA GRAMINIS TINSLEY 
Figs. 3,1; 5,1; and 16; PI. 1, G 
Reference. —Tinsley, 1898, 
Canad. Ent. 30: 13-14, fig. 2. 
Adult female. —Average 
length of body of dried speci¬ 
mens about 2 millimeters, width 
somewhat less; broad oval, 
tapering somewhat anteriorly, 
ovisac, when fully developed, 
much longer than the body, 
attaining a length of as much 
as 10 millimeters; dorsally with 
marginal and median plates 
or tufts of secretion, leaving an 
intermediate submarginal bare 
band running the full length of 
the body and interrupted by the 
dorsal plates only at the pos¬ 
terior end of the body; all 
secretions fragile, lateral tufts 
smaller, fingerlike, posterior 
ones flattened and curved back¬ 
wards over the ovisac, middle 
dorsal tufts plainly paired, 
closely crowded and standing 
nearly erect and fairly high; 
ovisac more or less distinctly 
ribbed and striate dorsally; 
anterior pair of median plates 
directed forward and appearing much 
larger than any of the others; body, 
as mounted, more or less distinctly oval, 
usually tapering somewhat anteriorly, 
length averaging a little more than 2.5 
millimeters, width averaging about 2 
millimeters, derm membranous ex¬ 
cept for a slight chitinized thickening 
on each side of the genital opening; 
antennae normally 8-segmented, meas¬ 
urements of one in microns as follows: 
I, 118; II, 107; III, 125; IV, 107; V, 
107; VI, 96; VII, 89; VIII, 143; spine, 
18; eyestalk rather flat conical, with 
Fig. 16—Orthezia graminis : Adult female, body, dorsal and 
ventral; X about 31 
body about as shown in figure, the 
dorsal bands narrowed medially or 
otherwise modified; ovisac band broad 
anteriorly, somewhat narrowed pos¬ 
teriorly, made up of spines, with a band 
of disk pores 2 to 3 deep along its 
anterior and outer margins, and a 
single irregular row along the inner 
margin of the anterior section, this 
broadening to an irregular row 2 or 3 
deep along the inner margins of the 
lateral and posterior sections, band 
interrupted laterally and posteriorly 
by transverse clear areas, and inclosing, 
