HORN EXPEDITION—COLEOPTERA. 
259 
This interesting little species may be at once clistinguislied from its congeners 
by the peculiar sculpture of its elytral interstices, each side of which is bordered 
by a very line smooth elevated line. 
Palm Creek, Ellery Creek, Reedy Creek. 
H. australis, Blackb. (4), Palm Creek, Ellery Creek, Rudall’s Creek. 
BEROSUS. 
B. maciunbensis, sp. nov. (2). Late ovalis ; convexus ; nitidus ; supra testa- 
ceus, hie illic fusco-adumbratus ; subtus niger, antennis palpis pedibusque testaceis; 
capite prothoraceque lequaliter fortius sat crebre punctulatis ; elytris apice 
emarginatis (parte emarginata extus spiniformi) subtiliter punctulato-striatis, 
interstitiis planis antice sparsim postice confertissime subtiliter punctulatis. Long. 
34 1. Lat. UL 1. 
This line large species bears much general resemblance to B. majusciilus, 
Blackb., but may be readily distinguished from all the previously-described 
Australian Berosi by the remarkable sculpture of its elytral interstices, which is 
sparse in front, but towards the apex becomes so crowded as to render the surface 
of the elytra opaque. 
Macumba Creek, Finke Ptiver (also taken by Mr. Zietz near Lake Callabonna). 
HYDROCHUS. 
H. Horni, sp. nov. (40). Elongatus ; nitidus ; niger, antennis (et nonnullorum 
exemplorum pedibus) obscure rufopiceis; capite subtiliter creberrime ruguloso ; 
prothorace subcordato, confertim sat grosse ruguloso-punctulato, in disco sub- 
obsolete 3-areolato elytris seriatim sat grosse sat crebre punctulatis, interstitiis 
alternis carinatis. Long. 14 1. Lat. 4 h 
At once distinguished from its jireviously-described Australian congeners 
by its deep black colour in combination with the distinctly-elevated alternate 
interstices of its elytra. Compared with the European If. brevis, Herbst., it is 
less nitid and much narrower and more parallel, its head very much more closely 
and finely sculptured, its prothorax less coarsely rugulose, with the central areola 
less defined and the seriate punctures of the elytra less coarse and the alternate 
interstices a little less strongly carinate. 
Paisley Blufi', Ellery Creek, Penny’s Spring, Rudall’s Creek. 
