184 
with two wide carinae. Length, 16-17 mm. 
Hab.— 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 
is closely resembled by mussoni, rugulosa, and polita; Mr 
by decipiens, etc. But the table given by Blackburn 
readily permits of the genus being split up into distinct and 
easily recognizable groups. 
RHOPAEA NIGRICOLLIS, n. sp. 
Pl. xxv., fig. 22; pl. xxvi., fig. 49. 
a dingy and rather pale castaneous-brown, 
of ] k head, prothorax, &" 
egs darker, head, p Mur 
« betw oming m l 
oF g much larger a rse 
Antennae ten-, flabellum seven-jointed, first joint of the latter 
very little shorter than the ot rothorar apparenvy 
about twice as wide as long, sides strongly rounded and 
sely serrated, all angles rounded off, median line shallow 
and incomplete; with crowded but not very large punctures, 
3 and: ith some larger ones scattered about. Scutellum Me 
: Y 
ly confluent, and with numerous considerably large 
Fones. Pygidium densely punctate and shag : 
strongly tridentate, the second tooth much nearer 
in third. Length, 18-20 mm. 
Roy. Soc. S. Austr., 1911, p. 189. 
