221 
minimo, quam hic 3° duplo longiori, quam 3" ceteris fere 
duplo longioribus inter se sat eequalibus ; oculis modice pro- 
minulis ; capite prothoraceque crebre subtilissime punctulato, 
illo medio planato; palporum maxillarium articulo ultimo 
precentibus 2 conjunctis equali, leviter obtuse elongato—sub- 
cultriformi; prothorace quam longiori vix latiori, plus 
minusve perspicue canaliculato; elytris crebre rugulosis, 
abdominis segmenta apicalia 2 vel 3 aperientibus, postice plus 
minusve dehiscentibus, apice singulatim rotundatis ; pedibus 
elongatis sat gracilibus, tarsorum posticorum articulo basali 
quam sequentes 2 conjuncti vix breviori; unguiculis granulo 
basali setifero subtus munitis. 
Maris segmento apicali filamento contorto testaceo utrinque 
instructo; mandibulis extus testaceis. Long., 45— 631. ; 
lat., #—12 1. 
The above detailed account of the structural characters is 
rendered necessary by the brevity of the generic diagnosis of 
Selenurus, which omits inter alia all reference to sexual charact- 
ers. The species before me seems to differ from Lchthyurus by 
its mandibles (which are truncate close to the apex, and have a 
short acute appendiculate piece attached to the outer part of the 
truncate end) by its longer and less dehiscent elytra, and by the 
intermediate legs devoid of sexual character. I suspect it 1s con- 
generic with Ichthyurus depressicollis, Macl. 
N.S. Wales ; Blue Mountains. 
S. sydneyanus, sp. nov. Elongatus; capite nigro (maris antice 
flavo, femine ad antennarum basin flavo-maculato), mandib- 
ulis flavis, antennis palpisque nigro-piceis (illarum articulis 
basalibus subtus rufis), prothorace flavo antice fascia nigra 
ornato, elytris obscure viridibus, pedibus nigro-piceis (tibiis 
anticis plus minusve dilutioribus), corpore subtus sordide 
flavo (metasterno medio nigro et abdomine plus minusve 
piceo-notato); prothorace haud canaliculato; elytris ab- 
dominis segmenta apicalia 3 vel 4 aperientibus; cetera ut 
S. variegati. Long., 2—84 1.; lat., 2—3 1]. 
oO a 
This species is evidently congeneric with the preceding. I find 
no difference in its structural characters. 
N. 8. Wales; in the suburbs of Sydney. 
HETEROMASTIX. 
H. anticus, sp. nov. Mas. Niger, capite prothorace antennis 
palpis pedibusque lete rufo-testaceis; pubescens; capite 
prothoraceque nitidis vix perspicue punctulatis ; hoc trans- 
verso antice vix angustato, lateribus leviter arcuatis ; elytris 
