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 ot" 

 the outer ocelli. Thorax luteous ; mesothorax black above, 

 with the sutures scarcely marked ; frontal lobe slightly 

 grooved ; a slight ridge bounding the black colour on each 

 side ; tlie 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 

 nervuresj four submarginal cells. Legs and abdomen luteous ; 

 hind femora, apical half of hind tibite, 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. — Antennae seven-jointed, black, with testaceous 

 yellow markings, paler beneath. 



Head testaceous yellow ; antcnnaj 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 

 antennjB, 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 antennae 

 a black stripe, contiguous with the spade-shaped spot, curves 

 inward on each side to the occiput. 



Thorax black, tliickly and rather finely punctured, the 

 sutures well defined ; prothorax with a v/aved yellowish 

 stripe on each side of the hind border ; mesothorax with the 

 central lobe with a smooth furrow, extending nearly to tlie 

 extremity, which is marked with a testaceous spot. Hinder 

 lateral borders of mesothorax narrowly testaceous j tegulse 

 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 ujiwards in front and tapering 

 behind, and one slender, nearer the median line ; there is also 

 a large testaceous spot above the hind coxa3. 



Legs testaceous, femora more or less black; hind legs with 



