184 



Scutellum with minute punctures. Elytra with small round 

 punctures in striae, of the latter the thirteenth and fourteenth 

 conjoined near base. Front tibiae with six teeth; hind ones 

 with two wide carinae. Length, 16-17 mm. 



Hah.— Western Australia (J. S. Clark). Type, I. 10658. 



Allied to trituberculatum, and with the head very- 

 similar, but the three prothoracic elevations much smaller, 

 closer together, in line with each other (instead of the median 

 one considerably in advance of the others) and arising from a 

 common base. 



Rhopaea. 



The species of this genus, although of large size, are very 

 difficult to separate on superficial examination, and this 

 difficulty is increased by the considerable variation that 

 appears to be common in the individuals of several species. 

 Thus verreaaxi varies in a fashion that is almost exactly 

 paralleled by magnicornis and assimilis (with the antennae 

 missing it would be difficult, I believe often impossible, to be 

 sure of the identity of specimens of these species) ; morbillosa 

 is closely resembled by mussoni, rugulosa, and polita ; hirtuosa 

 by decipiens, etc. But the table given by Blackburn W 

 readily permits of the genus being split up into distinct and 

 easily recognizable groups. 



Rhopaea nigricollis, n. sp. 

 PI. xxv., fig. 22; pi. xxvi. : fig. 49. 



d . Of a dingy and rather pale castaneous-brown, 

 sterna and parts of legs darker, head, prothorax, and 

 scutellum black, antennae flavous. Closely covered with short, 

 depressed, ashen pubescence, mixed with a few longer hairs, 

 these fairly numerous on prothorax ; sterna densely pilose. 



Head rather strongly convex and with crowded punctures 

 between eyes, becoming much larger and sparser on clypeus. 

 Antennae ten-, flabellum seven- jointed, first joint of the latter 

 very little shorter than the others. Prothorax apparently 

 about twice as wide as long, sides strongly rounded and 

 obtusely serrated, all angles rounded off, median line shallow 

 and incomplete; with crowded but not very large punctures, 

 and with some larger ones scattered about. Scutellum with 

 crowded punctures. Elytra with vague remnants of discal 

 costae; with small dense punctures, often finely wrinkled or 

 transversely confluent, and with numerous considerably larger 

 and deeper ones. Pygidivm densely punctate and shagreened. 

 Front tibiae strongly tridentate, the second tooth much nearer 

 the first than third. Length, 18-20 mm. 



(7) Trans. Roy. Soc. S. Austr., 1911, p. 189. 



