509 



four- jointed. Prothorax less than thrice as wide as the median 

 length, sides moderately rounded in middle, thence oblique 

 to apex and subarcuate to base, front angles produced and 

 very acute, the hind ones obtuse but not rounded off; 

 punctures sparse and small. Elytra somewhat dilated 

 posteriorly; geminate-striae moderately distinct, puncturee 

 fairly dense and of moderate size; sutural mucros acute and 

 moderately long. Pygidium rough and granulate. Basal 

 joint of hind tarsi longer than second. Length, 18-21 mm. 



Hab. — South Australia: Murat and Denial Bays (Dr. 

 C. T. Abbott). Type, I. 4635. 



The polished portion of the elytra commences almost at 

 the scutellum on the suture, but on the sides about the 

 middle, so that the outer basal portion and the entire 

 pronotum is opaque, but with a kind of bloom, this being 

 exactly alike on the six specimens before me ; but on twisting 

 the specimens about the bloom, from certain directions, 

 appears to be almost white. On some specimens the proportions 

 of the maxillary joints of the palpi are not clearly visible, 

 but on dissection the penultimate joint is seen to be distinctly 

 shorter than the antepenultimate, so that the species should 

 not be referred to Group 4 ; but if referred to that group it 

 could only be placed in CC, from all the species of which it is 

 strikingly different in general appearance, and even in a 

 bright light it is but faintly iridescent. Referring it to Group 

 5, it should be placed with D, EE, and the base of its 

 prothorax is as on sinuaticollis < 12 ). In general appearance, 

 except for the bloom, it seems close to fir ma and small 

 specimens of decepior. The prothorax is longer than usual in 

 the genus. The elytral fringes are rather peculiar and unlike 

 those of any other species I have examined; on each side at 

 the base a row of stiff setae, directed at right angles to the 

 derm, commences in the usual way, but the setae soon become 

 closely compacted, till from about the middle they are touch- 

 ing, and at the first glance appear to form a rather long 

 ragged membranous fringe right to the apex, but the true 

 membranous fringe is very short, and quite concealed from 

 above. On the male the fifth joint of the antennae has a 

 short but acute spur, and the rami of the club are subequal in 

 length, and considerably longer than the basal joint, on the 

 females the fifth joint has a shorter and less acute spur, and 

 the first joint of the club is only about two-thirds the length 



(12) The sinnation of the base relied upon by Blackburn to 

 separate F and FF is a very unsatisfactory character, and the 

 Avords "strongly" and "feebly" used are misleading, as in co- 

 types of sinuaticollis and rustica the difference at the base is but 

 slight. 



