28 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
acaciae, while the reverse of this condition appears to hold in regard 
to the large marginal setae, these being much more conspicuous and 
more numerous in acaciae than in australis. The larvae may be very 
readily differentiated by an examination of the large dorsal setae, 
these having slightly enlarged, usually tricuspidate apices in australis 
and bluntly rounded apices in acaciae, and by the presence of three 
pairs of long apical setae and some shorter, lateral slender setae in 
australis in contrast to the two apical pairs and the lack of lateral 
slender setae in acaciae. 
Genus STEATOCOCCUS Ferris. 
STEATOCOCCUS NUDATUS (Maskell). 
Reference.—Paleococcus nudatus (Maskell), Fernald Cat. Cocce. 
World, 1903, p. 22. 
This species is represented in Maskell’s collection by two slides as 
follows: One of “adult female, 1895,’ and one of ‘‘larva, 1895.” 
No unmounted specimens have been located, although according to 
Maskell’s notebook there should be some present under No. 475. 
Additional specimens from the National Collection of Coccidae, col- 
lected by George Compere (No. 361), at Corawa, New South Wales, 
‘on various species of grass’”’ have been available for comparative 
study. 
Adult female-—Maskell’s description of the external appearance of 
of this insect sufficiently charateristic; abdominal cavity largely filled 
at maturity by a dermal sac, invaginated from a point on the center 
of the abdomen just posterior to the hind legs, in which the eggs are 
presumably laid, and from which the larvae emerge, the entrance to 
the sac indicated by a somewhat transverse oval opening, the poste- 
rior border of this forming a heavily chitinized rim, the anterior 
hardly distinguishable from the adjacent derm, all this overlooked by 
Maskell; specimens as mounted on slides as much as 6 mm. long by 
5 mm. wide, egg-shaped, broadest behind the middle; derm clearing 
almost completely on treating with potassium hydroxide; antennae 
moderate in size, 10-segmented, not unusal; legs large and stout, the 
claw stout, the digitules slender; beak short and stout, indistinctly 
2-segmented; with two pairs of large thoracic and three pairs of 
much smaller abdominal spiracles, the latter at the posterior end 
of the body, the thoracic much the larger, all simple; derm with 
small, circular to somewhat oval, disk pores scattered widely and 
rather uniformly over the surface both dorsally and ventrally, with 
circular, triangular or oval centers, the latter predominating, and 
about nine loculi, also some with fewer loculi, perhaps the same sort 
incompletely developed; dorsally in anal ring region and ventrally 
and internally in genital region with somewhat larger, less heavily 
chitinized circular pores, these quite crowded in the genital region, 
