672 
Journal of Agricultural Research 
Vol. XXI, No. 9 
between middle line and body margin, one pair on posterior half of mesotliorax, one on 
anterior half of metathorax, one on first abdominal segment, no types of pores other 
than these two observed; derm bearing only small, slender setae, these in longitudinal 
rows, with a submedian and a submarginal both dorsally and ventrally, and a marginal 
row, this last having the smallest setae, with one seta of each row to each segment, at 
least on the abdomen; a few of the setae near the antennae much larger; apex of body 
terminating with two pairs of very large setae, relative to those on the body, the outer 
pair about 53 microns long, the inner about 125 microns; without traces of anal lobes; 
anal ring small, simple, flattened and extended below, with a more heavily chitinizcd 
inner margin, placed apically or a little ventrally, bearing two small setae above, two 
near the lower edge of the opening, and two, larger, at the lower edge of the chitini- 
zation. 
Second-stage female (PI. 132, A-D).—Shape variable, according to stage of 
development, shortly after first molt somewhat ovate, broadest a little anterior to 
middle, tapering posteriorly, rounded anteriorly, length at this time 0.32 min., width 
about 0.185 mm., - later enlarging and approaching more nearly the broad oval form 
found in the typical adult; derm clearing completely on being treated with caustic 
potash, showing many small, angularly pointed papillae, these much less conspicuous 
in the older swollen specimens, not in distinct close clusters, but scattered along the 
body margin and in the submarginal area beneath, largest anterior to the antennae; 
antennae placed ventrally near anterior apex of body, nearer to margin than to each 
other, very much reduced, apparently i-segmented, the apex slightly invaginated 
and bearing five small, stout setae; without traces of the eye spots or legs in mounted 
specimens; framework of mouthparts large and conspicuous, beak very short and stout, 
apparently i-segmented, but this not definitely determinable; spiracles with a circular 
opening at the outer end of an elongate chitinous bar having a somewhat expanded 
inner end, and with a loose cluster of 4 to 7 relatively large, quinqucloeular disk pores 
around the opening, the anterior spiracles usually with one or two more of these than 
the posterior pair; derm along the margin, and in the submarginal region ventrally, 
with a number of the long tubular ducts already described for the larva, these scattered 
rather uniformly, varying somewhat in size and much less numerous than the derm 
papillae; body dorsally, at the margin, and ventrally with a few longitudinal rows of 
short and stout, acute setae; anal ring placed ventrally near the posterior apex of the 
body, small, simple, the opening somewhat kidney-shaped, retaining a single pair of 
small setae, these morphologically at the lower angles of the ring. 
Adult female (PI. 133, A, D-M; PI. 134).—The living specimen, lying on the 
surface of the host tissue, more or less surrounded by a rim of dense waxy secretion, 
this ordinarily white, but often discolored through the incorporation of particles of 
foreign matter; body varying considerably in shape, stout oval, often somewhat 
broader behind, not strongly convex, the dorsal surface flattened, ventrally excavated 
along the middle line, presumably to furnish a space for the emergence of the larvae; 
body color reddish, except for the central area, this appearing pale greenish yellow; 
dorsally faintly shining; with some fine, scattered, curved, glassy threads of secretion 
dorsally, particularly near the margin; color ventrally similar to that of dorsum, 
with the large groove already mentioned more or less filled with a loose, fluffy secretion 
of glassy threads similar to those occurring dorsally, but much longer, much more 
abundant, and curled. 
Adult female morphologically stout and broad oval, often nearly circular, length 
just after molting about 0.5 mm., width about 0.37 min., maximum length of speci¬ 
mens examined 1.4 mm., width 1.1 mm.; derm just after molting clearing completely 
on being treated with caustic potash, the derm around the margin showing a broad 
band of closely crowded, elongate papilla, each with serrate or denticulate apex, and 
dorsally, laterally and ventrally longitudinal rows of small, stout seta; fully matured 
