606 STUDIES IN AUSTRALIAN ENTOMOLOGY, NO. XII., 



into tan obtuse piojection at humeral angles; lateral border 

 ^videly reflexed, a little narrower near base; striae simple; inter- 

 stices strongly convex, the discoidal ones not becoming carinate 

 on apical declivity, 1-7 about equal in width on basal half, eighth 

 and ninth narrow (about equal in width on basal half), inner 

 margin of ninth interrupted by umbilicate punctures, tenth well 

 developed before apical sinuosity (but not long). Prosternum 

 depressed between coxae; basal declivit}^ flat, wide; mesosternum 

 w^ith intercoxal declivity flat. Femora stout, posterior with lower 

 side dilatate above trochanters. Length 17, breadth 5*7 mm. 



Hah. — Q. : Tambourine Mountain, near Brisbane (lUidge; 

 Colls. Illidge, Lea and Sloane). 



Belongs to the X. nitidicoUu-groui^, which is characterised by 

 having the intercoxal declivit}^ of the prosternum flat, eh'tra w^ith 

 third interstice bipunctate, pronotum nitid and with posterior 

 marginal seta not placed on border, tfec. It may be distinguished 

 at once from S. nitidicollis, Chaud., jV. latibatiis, 81., X. queens- 

 landica, SI., and X. subopacus, Chaud., by its larger size, wholly 

 black colour, elytra with sixth interstice not narrowed near base; 

 from X. violaceomarginatKs, Macl., b}^ the same features, except- 

 ing size, and by the more elongate prothorax with rectangular 

 basal angles. In facies it more resembles X. iirayerut<, SI., than 

 any other species known to me, its head, prothorax and elytra 

 being in a general w^ay somewhat similar, but it difiers b}" form 

 stouter and less depressed; eyes less prominent; posterior marginal 

 puncture of prothorax not placed at basal angles on a dilatation 

 of the border; elytra more convex, with interstices 2-5 hardly 

 narrowed and not carinate at apex. 



It seems impossible for X. plajiipectus to be X. ingratus, Chaud., 

 which is unknown to me, but which, from Chaudoir's notes, must 

 be taken to have the prothorax with basal angles not rectangular; 

 besides, I think the el3^tral interstices of X. planipectus could not 

 be described as '■'■ partim et cequaliter convexisf nor could the 

 humeral angles, which are unusually strongly dentate, be said to 

 be " minime deutatis.'^ 



