ART. 17. MONOPHLEBINAE AND MARGARODINAE—MORRISON. 17 
taining numerous glassy threads, probably always secreting a mass 
of white fluffy matter at oviposition; antennae 7—9-segmented, taper- 
ing, terminal longest; legs well developed, stout, the tarsus, tibia, and 
in some species, the femora, bearing numbers of stout spines; these 
less developed in one species; beak indistinctly 2-segmented, short 
and stout; with two pairs of thoracic and seven pairs of abdominal 
spiracles, the first much larger, the abdominal pairs cylindrical and 
with a cluster of pores around the opening of each; derm usually 
with large tubular trilocular ducts (responsible for the glassy threads 
of the secretion), with one to three different sorts of multilocular disk 
pores, these usually different dorsally and ventrally, and at least one 
sort relatively abundant, with scattered long slender setae set in con- 
ical bases, varying greatly in size but largest along body margin, 
usually with very numerous, closely crowded, long tapering, sharply 
pointed spines, these much less numerous in one species, usually 
largest along body margin, and with or without lanceolate or cvylin- 
drical specialized spines; with a large internal anal tube having a 
heavy band of irregular wax pores at its inner end; ventral cicatrices 
small, circular, very numerous, arranged in transverse rows across 
the abdominal segments anterior to the genital opening. Larva elon- 
gate oval, antennae 5-segmented, legs normal, slender, claw with one 
pronounced and one or two obscure denticles, claw digitules hair-like, 
number of spiracles as in adult, but these without pores and the 
contrast in size between thoracic and abdominal much more pro- 
nounced; derm with a marginal row of 13-14 pairs of large trilocu- 
lar tubular pores, and with disk pores in longitudinal rows, with longi- 
tudinal bands of stout, cylindrical or lanceolate spines and with simi- 
lar rows of slender setae; anal tube with a collar of wax pores and a 
ring of disk pores at opening; with four pairs of small circular ventral 
cicatrices. Male elongate, parallel-sided, antennae 10-segmented 
(Maskell), segments, except basal, constricted medially and bearing 
two whorls of hairs on each; apex of head triangular; compound eyes 
large, protruding, ocelli large; wings not unusual; abdomen elongate, 
parallel-sided, with spiracles; apical margin of segments more or less 
produced into fleshy finger-like appendages; penis sheath stout, 
tapering to an acute point. 
On the basis of our present knowledge, the genus is exclusively 
Australian in its geographic distribution. 
The principal distinguishing characters of the adult females of the 
included species are to be found in the character and proportional 
abundance of the derm pores and setae, structures whose differences 
are quite apparent on comparison but are difficult to express in words. 
