294 
nonnihil subacutis posticis subrectis, basi utrinque 
bisinuata (lobo mediano modico postice sat rotundato); 
scutello modico lanciformi; elytris tuberculato-inæqua- 
libus, serierum normalium  tuberculis nitidis levibus 
(nonnullis postice ad apicem spongiosis) 3" sat parvis 
бе Те 9% gradatim magis parvis ceterarum granuli- 
formibus, granulis minutis (vel puncturis) inter series 
normales lineatim sinuatim dispositis, serie 3^ breviter 
(D^ haud vel vix) ad basin cariniformi, 1° ad basin 
haud ut carina ad scutelli latera continua, callo sub- 
apicali minus perspicuo; tibiis anticis extus dentibus З 
bene definitis armatis (dente apicali quam ali multo 
majori): prosterno medio pone coxas minute acuto. 
Long., 63 1.; lat., 4 1. 
The nitid punctureless tubercles of the systematic series on 
the elytra (some of them nevertheless being spongiose on a 
small area at the hinder part of their apex), together with 
the subsutural systematic series not at the base becoming 
cariniform and continuous along the sides of the scutellum, 
distinguish this species from all others bearing a general re- 
semblance to it except quadridens, Blackb., which it closely 
resembles, though I am quite satisfied that the two are valid 
species. Hyrensis (which I have seen only from the south- 
west coast of Australia) has the sides of its prothorax evenly 
arched (rarely slightly sinuate), from the front nearly to 
the base, and then feebly sinuate, while in quadridens (which 
I have seen only from north of Port Augusta) the sides of 
the prothorax are quite strongly trilobed. There is also a 
reliable distinction in the armature of the front tibiæ. In 
both species those tibiæ have three or more external teeth 
(not rarely 4 on one tibie and three on the other), but in 
quadridens the subapical tooth is fully as large as the apical, 
while in eyrensis the apical tooth is very much larger than 
the others. I find also that the tubercles of the systematic 
series in eyrensis have. much more spongiose tissue than in 
quadridens. In the latter, those tubercles are (as in 7. 
Crotchi, Har.) all but absolutely without it: while in the 
former the postero-apical surface of most of them is dis- 
tinctly opaque and spongiose, with the result that, looked at 
obliquely from behind, eyrensis might almost be referred to 
the litigiosus group of species, while regarded obliquely from 
in front scarcely any opacity can be seen on the tubercles. 
Apart from the different character of the tissue of its elytral 
tubercles eyrensis bears considerable general resemblance to 
the larger species of the /itigiosus group. Im other respects, 
however, it differs from them, inter айа, as follows: —From 
litigiosus, Har., by the more numerous external teeth of its 
