BY THOMAS G. SLOANE. 505 



ff. Prothorax with inidclle of base truncate P. truncatus, SI. 

 AA. Elytra without pale vittai on disc 



i. Head large ; prothorax not greatly 

 wider than head, not deeply eniar- 

 ginate at apex, anterior angles [P. planus, Newm. 



lightly marked \P. tmicolor, Ch. 



ii. Head small, prothorax much wider 



than head, 

 j. Prothorax with apex lightly eniar- 

 ginate. 

 k. Prothorax with anterior angles 



widely rounded P. occidentalis, Blkh. 



kk. Prothorax with anterior angles 



marked P. ojiaciceps, Blkl). 



jj. Prothorax with apex deeply emar- 

 ginate. 



I. Prothorax with sides lightly rounded, 



base lightly lobate in middle P. discorufus, SI. 



II. Prothorax with sides ampliate and 



strongly rounded, basal lobe 



strongly developed P. immaculatus, Ch. 



il. Prothorax with two setigerous punctures on 

 each side. 



M. Testaceous discoidal vittte of 

 elytra continuous, extending 

 behind middle, 

 n. Prothorax deeply emarginate at 



apex, testaceous discoidal vittas/ P. intermedius, Ch. 



of elj'tra uniting near apex I P. sydneyensis, Blkb. 



nn. Prothorax very lightly emar- 

 ginate at apex, discoidal vittse 

 of elytra attenuate posteriorly 



and not inturned near apex... P. con/ertus, Blkb. 

 MM. Each elytron with a testaceous 

 mark of varying shape on 

 anterior part of disc and 

 usually with apex or a small 

 apical spot of same colour. 

 0. Discoidal testaceous plaga ellip- 

 tical (narrow, elongate) P. angulatus, Ch.. 



oo. Discoidal testaceous markings 

 irregular, extending from 

 first to seventh intei slices... P. hicidentus. Newm. 



