agt.17. MONOPHLEBINAE AND MARGARODINAE—MORRISON. 3)3) 
numerous, long, blackish and hair-like, but not aggregated into con- 
spicuous marginal tufts; anal opening with a simple ring and a short, 
simple, internal tube; with three rather large ventral cicatrices, the 
median approximately circular, the two lateral elliptical. 
Intermediate stage female—Essentially similar to adult; for details 
see Maskell’s description. 
Larva.—Length 0.625 mm., width 0.36 mm., ovoid, strongly tapering 
posteriorly; antennae and legs of the normal form for the genus, the 
antennal club fairly stout; tarsal claw slender with a single distinct 
denticle near apex, the claw digitules slender, thread-like, with a tiny 
knobbed apex extending beyond claw; beak very short conical; 
with two pairs of thoracic and two pairs of very much smaller abdom- 
inal spiracles, these located at the tip of the abdomen and the 
posterior pair larger; derm with longitudinal rows of small, approxi- 
mately circular, multilocular disk pores, four rows on each half of 
the abdomen, and similiar rows of rather large, more or less blackish 
setae, two rows on each half of the abdomen, many of these appearing 
somewhat blunted at apices, but this, so far as can be determined, 
due to injury; marginal setae, particularly near apex of abdomen, 
somewhat longer than those dorsally; with three pairs of large setae, 
a little longer than the entire body, at the apex of the abdomen; anal 
tube with internal double pore collar, and circle of disk pores at 
mouth, as is usual in the genus; with a single ventral cicatrix. 
Adult male.—This is represented by the slide of the various parts 
in the Maskell collection showing no conspicious peculiarities, differ- 
ing, however, from purchasi in the greater length of the caudal tassels 
and the greater prominence of the margins of the penultimate 
abdominal segment. 
Cotypes (larvae).—Cat. No. 25273, U.S.N.M. 
As noted by Maskell, the unusual feature of this insect is its close 
resemblance to purchasi. The differences which he indicated in the 
size, the presence of the large dorsal pencil of secretion, the normally 
10-segmented antennae and so on, seem quite sufficient to distinguish 
the two. The available larvae of koebelei are in poor condition and 
possibly on this account fail to show any distinctive characteristics 
which might be cited to separate this stage from the corresponding 
one of purchasi. While not intending to revive a subject of some 
previous controversy, it seems desirable to point out that this species, 
fully accepted as being indigenous to Australia, appears to possess in 
common with J. purchasi, besides many other points of close similar- 
ity, two pairs of adominal spiracles, in contrast to all the other species 
of Icerya known to the writers, three pairs of these being the usual 
number in the genus. 
