10. PERGA. 19 



Exp. al. 1 poll. 7 lin. ad 1 poll. 11 lin., long. corp. 11-12 lin. 



Male. Greyish blue above ; abdomen bluer and more shining ; 

 clypeus, labrum, antennas, a small spot on each side of the back of 

 the head, behind the eyes, scapulae, and almost the whole prothorax 

 except just behind the head, a large triangular spot on each side 

 of the pectus, a smaller one above the posterior coxae, scutellum, 

 and legs rufo-testaceous, the former with very shallow punctures ; 

 middle of pectus and undersurface of abdomen shining violet-blue. 

 Abdomen above with segments 2-5 at least covered with a silky 

 pubescence in the middle ; back of head and thorax moderately 

 punctured, sides of pectus very coarsely so ; scutellum smooth. 

 Wings deep yellowish hyaline, with reddish costa, stigma, and 

 nervures ; costa of fore wings very strongly arched. 



The female has the costa less strongly arched ; the abdomen is 

 longer, silky green above, and the segments are but slightly edged 

 behind with silky pubescence. The legs, scutellum, &c. are gene- 

 rally paler than in the male, and the scutellum is more deeply 

 pitted. The spot on the sides of the pectus is smaller, sometimes 

 almost obliterated. In one specimen the hind femora are blackish 

 at the extremities above, and ferruginous in the middle. The saws 

 are reddish. 



The details representing the head of the female are copied from 

 Gen. Hardwicke's unpublished drawings. 



Hah. Australia (Moreton Bay, &c). 



a. $ . (Type of species,) Australia. W. E. Leach. 



b. 2 • Australia. H. G. Harrington, Esq. 

 c,d. 6 2 • 



2. Perga aifinis. 



(Plate I. figs. 13 & 14.) 



Exp. al. 1 poll. 5 lin. ad 1 poll. 11 lin., long. corp. 9-10 lin. 



Head and thorax dull bluish or greenish above ; clypeus, labrum, 

 scapulas, collar, scutellum, and the whole of the sides of the 

 pectus (except a long irregular bluish mark which runs from 

 beneath the base of the fore wings towards the base of the 

 intermediate pair of legs) pale yellow. Antennae ferruginous, 

 pale yellow at the base. Cheeks more or less yellowish ; thorax 

 with a short yellowish stripe on each side in front. Legs ferru- 

 ginous. Back of metathorax and of the first segment of the abdo- 

 men pale yellow ; the second segment is narrowly edged with red 

 in front, and this and the four following- segments are covered with 

 silky pubescence ; the seventh and eighth segments are marked 

 with three red bands, the first most distinct, but interrupted in the 

 middle. On the underside, the middle of the pectus and abdomen 

 are shining black, the abdomen, however, being mottled with rufo- 

 testaceous, and the anal plate is of the same colour. Wings 

 yellowish hyaline. 



Female similar to the male, but the antennae and legs are yellowish 



c2 



