Species of Australian Saw-flies. 41 
tubercles to the occiput, where the black colour is convex, 
being contracted behind; a shallow groove on each side of 
the outer ocelli. Thorax luteous; mesothorax black above, 
with the sutures scarcely marked; frontal Jobe slightly 
grooved; a slight ridge bounding the black colour on each 
side ; the smooth space between this and the large oblique 
ridges running back to the scutellum are tawny. Scutellum 
tawny, grooved in the middle, with the apical points lobate, 
situated at the hinder angles, and projecting very slightly 
outwards. Wings yellowish hyaline, with reddish costa and 
nervures; four submarginal cells. Legs and abdomen luteous ; 
hind femora, apical half of hind tibiz, and the greater part of 
the hind tarsi beneath rufous. 
Resembles P. bicolor, Leach, in the structure of the thorax. 
Perga Lalage. 
Long. corp. 10-12 millim. 
Male.—Antennex seven-jointed, black, with testaceous 
yellow markings, paler beneath. 
Head testaceous yellow; antenne tawny, sometimes with 
the two basal joints blackish ; ocelli occupying the upper and 
broadest part of a spade-shaped blotch. ‘The upper ocelli are 
black and stand at the extremities of a ridge like a pointed 
arch, below which the lower ocellus, which is reddish, stands. 
A broad stripe runs backwards from the spade-shaped spot 
nearly to the occiput; the spot tapers forward between the 
antenne, leaving a space within the base of each yellow, and 
the black colour then extends over the clypeus (except a short 
line on each side at its lower extremity) and labrum. ‘The 
mandibles are also blackish or dark red. Above the antennze 
a black stripe, contiguous with the spade-shaped spot, curves 
inward on each side to the occiput. 
Thorax black, thickly and rather finely punctured, the 
sutures well defined; prothorax with a waved yellowish 
stripe on each side of the hind border; mesothorax with the 
central lobe with a smooth furrow, extending nearly to the 
extremity, which is marked with a testaceous spot. Hinder 
lateral borders of mesothorax narrowly testaceous; tegule 
and scutellum testaceous, the latter grooved and with the 
apical tubercles nearly straight. Pleura with three testaceous 
or whitish stripes on each side, one below the wings, one (the 
broadest) lower down, widened upwards in front and tapering 
behind, and one slender, nearer the median line ; there is also 
a large testaceous spot above the hind coxe. 
Legs testaceous, femora more or less black; hind legs with 
