270 
HORN EXPEDITION—COLEOPTERA. 
The sculpture of their underside, however, apd especially their sexual characters, 
render their identitication perfectly easy. The present species (which is one of the 
largest of the group) possesses, nevertheless, a superticial character in the sharp, 
tooth-like dilatation of the elytral margin behind the shoulders, that distinguishes it 
at once from all the others known to me. The foui’ examples in the Horn collec¬ 
tion are all (juite identical inter se (saving some little variation in the size of the 
elytral impressions and the continuity of the costie). Tliey are almost devoid of 
the dust-like pubescence that is so dense on many of the ChalcokenicB, but this may 
be due to abrasion. I cannot feel certain of their sex; they are devoid of the 
metasternal excavation and dense, erect pubescence that distinguish the males of 
some species, and the triangular emargination of their apical ventral segment is 
smaller and narrower than in the males of the other species of which I know that 
sex ; nevertheless I think they are males, as I have not seen any certainly female 
Chalcotcenia in which the sculpture of the apex can be called a deep, sharply- 
triangular emargination. The close, fine puncturation of the ventral segments 
leaves a median, brightly polished and coarsely but very sparsely punctured space, 
wliich gradually narrows hindward from the basal segment ; on the last two seg¬ 
ments this median space becomes a mere line—too narrow to carry any of the 
punctures and slightly elevated—which has the appearance of a not quite con¬ 
tinuous Carina. There is a female Chalcohenia in the Horn collection which may 
possibly pertain to this species, but from several of its characters I suspect rather 
that it is of a species of which I have not seen the male, and therefore it is better 
not to characterise it until further evidence is to hand. 
Illara Water, IllamuiTa, Carmichael Creek, Alice Springs. 
C. sulciventris, sp. nov. (2). Minus lata; nitida; supra viridis (hie illic 
aurata), partibus elevatis plus minusve cyerulescentibus, capite antice cupreo, 
antennis (articulis basalibus 2 exceptis) rufescentibus; subtus viridis, partibus 
elevatis nonnullis (certo adspectu) violaceis vel cuprascentibus ; capite subcircu- 
lariter excavato et longitudinaliter canaliculate et inaequali, sat grosse minus crebre 
(postice magis subtiliter magis crebre) punctulato; prothorace quam longiori minus 
quam dimidio latiori, antice sat subito sat fortiter angustato, canaliculate, latera 
versus intequali et irregulariter oblique impresso, in partibus depressis crebre minus 
fortiter (in convexis grosse sparsim) punctulato, basi trisinuata; elytris postice 
extus denticulatis, supra interrupte imequaliter costatis, partibus depressis crelire 
minus fortiter (maculis binis quam partes depressie cetene magis crebre magis 
subtiliter) costis sparsim fortiter punctulatis ; metasterno et coxis posticis in parte 
mediana longitudinaliter planatis, setis subtilibus erectis sparsim vestitis. 
