1114 ON THE CARENIDES, WITH DESCRIPTIONS OF NEW SPECIES, 
smooth, squarely transverse (4| x 8), somewhat wider than the 
elytra ; truncate in front, with the angles advanced, the sides a 
little rounded ; the posterior angles square ; the base sinuate, with 
a short wide lobe ; the lateral margins rather widely reflexed, 
especially at the posterior angles ; the disc rather flat, with a 
distinct median line ; two lightly marked setigerous punctures on 
each lateral margin, one towards the anterior angle, and one at the 
posterior angle ; in front a faint transverse impression becoming 
more distinct towards each anterior angle. Elytra convex 
(11 X 7|), with the sides a little rounded, widest at about one-third 
of their length from the base ; the humeral angles rounded, with 
the edge a little turned back ; the base truncate ; seven rows of 
closely placed shallow punctures on each elytron ; two larger 
discoidal situated towards the apex ; three punctures in a 
single row on the base of each elytron ; the usual row of 
punctures extending along each lateral margin. The anterior tibije 
tridentate externally, the exterior ridge with three projections ; the 
inferior ridge serrate, reaching nearly to the tarsus ; the apical 
plate without any projecting tooth. 
Loc. — Tintinallogy, Wilcannia, N.S.W. (Dr. H. A. Ellis). 
This species is distinct from the other two described species of 
the sub-genus Platythorax. 
Carenum arenarium, sp.nov. 
Nigrum, nitidum, prothorace elytrisque violaceo-marginatis ; 
capite sub-quadrato, supraoculos bipunctato, sulcis frontalibus 
profunde impressis, antice fortiter postice leviter divergentibus, 
postice fossula curvata conjunctis ; prothorace transverse, lateribus 
subrotundatis, marginibus tenuiter reflexis, angulis anticis vix 
productis, posticis I'otundatis, postice utrinque levissime emargi- 
nato, basi truncate, vix lobato, disco canaliculate, confertim leniter 
transversim ruguloso, marginibus utrinque tripunctatis ; elytris 
prothorace paullum latioribus, basi truncate, humeris notatis, 
quad rip unctatis, subtilissime striatis ; tihiis anticis bidentatis. 
Long. 22-26 mm., hit. 7-8 mm. 
