BY REV. T. BLACKBURN. 257 



DD. (?. Elytra black with some of the inter- 

 stices yellow or reil lo, Blackb. 



CC. Elytra not having longitudinal lines of con- 

 trasted colours. 

 D. The principal elytral markings are spots or 



blotches on the posterior declivity Atalanta, Blackb. 



DD. Elytra with (if any markings) only a large 



subbasal obscure blotch interstitialis, Chp. 



P. CERNUA, Chp. 



This species is one that I have not seen. It is described as of 

 very large size (long. Q^ lines), with the seriate and interstitial 

 punctures of the elytra large and of equal size, and' with the 

 seriate punctures very flexuous in arrangement. It is said to 

 occur near Sydney. 



P. LiGXEA, Er. (ornat/coUis, Chp.). 



That this is one of the most variable species in the genus I can 

 affirm confidently, as I have taken some of the extreme forms in 

 company with typical examples under circumstances that allowed 

 no doubt of their specific identity. I think it is easy to identify, 

 nevertheless, inasmuch as its being a member of this present sub- 

 gi'oup is unmistakable, and in the subgroup it is the only species 

 having the punctures of the elytral interstices everywhere as 

 large as (in fact they are a little larger than) those of the adjacent 

 series, all these punctures ver^ coarse (in every part of the elytra 

 they are notably coarser than the seriate punctures of the common 

 P. infacfa, Newm.), and also all these punctures not (or scarcely) 

 coarser in one part of the elytra than in another {i.e., not 

 becoming notably coarser towards the sides or apex of the elytra, 

 except in some examples close to the margin). The punctures of 

 the interstices are more or less seriate in arrangement. It is of 

 ovate, and not particularly short, form, and of only moderate 

 convexity (especially the males) with the greatest height of the 

 elytra (viewed from the side) decidedly behind the middle of the 

 length of the lower outline (i.e., the lateral margin) of the elytra. 

 The puncturation of the prothorax is more or less uneven and 



