42 
base and thence (viewed from above) quite parallel hindward, 
the hind angles being sharply rectangular (almost dentiform). 
The shape of the prosternal process also calls for attention. 
This in the genus Semanopterus rises perpendicularly behind the 
coxe and its summit is bent forward so as to project slightly 
between the coxe towards the head. In the present species it is 
densely clothed with long sete and is considerably narrower 
than in some species of the genus; its perpendicular face is 
strongly convex,—almost cariniform,—and its forward bend is 
only slight, the bent-forward part being quite narrow and almost 
evenly continuing the curve and convexity of the perpendicular 
part. In some species the bent-forward part is much wider 
flatter and almost at a right angle to the perpendicular part. 
Alice Springs, Oodnadatta, Leigh’s Creek and Barrow’s Creek. 
S. persimilis, sp. nov. Ovalis; sat latus ; nitidus; piceo-niger, 
subtus obscure rufescens longe sat dense rufo-pilosus ; capite 
crasse squamose ruguloso, tuberculo conico inter oculos 
armato; prothorace quam longiori dimidio latiori sat crebre 
sat fortiter (in depressione crasse squamose) punctulato, 
antice angustato, lateribus sat fortiter rotundatis mox ante 
basin subito fortiter incurvis hinc ad basin (superne visis) 
rectis, angulis anticis sat prominulis posticis acute rectis ; 
elytris 4-costatis (costa suturali inclusa), interstitiis sat 
crasse nec crebre nec profunde punctulatis; tibiis anticis 
extus valde fortiter (maris quam feminz etiam magis for- 
titer) tridentatis ; segmento ventrali 6° punctulato, postice 
vitta transversali Jevi marginato ; processu prosternali sat 
angusto carinato, parte summa antrorsum directa minute 
planata et antrorsum deelivi. 
Maris prothorace antice fossa magna rotundata profunda, postice 
sulco longitudinali, impresso ; segmento 6° ventrali postice 
emarginato. 
Femine prothorace longitudinaliter sulcato, sulco et ante et 
pone medium dilatato; segmento ventrali 6° simplici. 
Long., 7—8 1. ; lat., 4—42 1. 
This species is very closely allied to S. rectangulus, Blackb., 
from which it differs by the nearly black color of its upper sur- 
face, the evidently stronger puncturation of its prothorax, the 
larger teeth on the external margin of its front tibie, the more 
confused sculpture of its clypeus and the different shape of its 
prosternal process. This latter (as in rectangulus) consists of an 
erect somewhat narrow piece keeled on its hind face rising from 
the surface of the prosternum behind the coxee and at its summit 
bent forward slightly towards the head; but whereas in 
rectangulus this bending forward is the result merely of the top 
