260 
HORN EXPEDITION—COLEOPTERA. 
//. interioris, sp. nov. (17). Elongatus; minus niticlus; obscure viridis, 
antennis })alpis pedibusque soi’dide tcstaceis, femoi'ibus posticis infuscatis ; capite 
cum protborace minus grosse minus confertim ruguloso, illo (sutura clypeali 
excepta) jctpiali; protborace bic illic obsolete impresso, cordate ; elytris seriatim 
minus grosse sat crebre punctulatis, interstitiis 5° postice 9 ’ que in medio leviter 
carinatis. Long, li 1. Lat. 'i 1. 
Judging by the description of H. obscuro-cefieus, Fairm. (from North Queensland), 
I should judge that this species much resembles it; but inter alia. Fairemaire’s 
insect is said to have a median fovea on the head (of which I find no trace in H. 
interioris) its elytra are said to be “grosse striato-crenatis,” whereas in H. 
interior is the seriate punctures of the elyti’a are, in comparison with those of an 
AXfiVAgQ Hydrochns, rather exceptionally small. H. parallelus, Mach, also resembles 
this species, but difters inter alia by its longitudinally striate head. Its green 
colour distinguishes H. interioris from the other described Australian Hydrochi. 
Paisley Bluff, Ellery Creek, Palm Creek. 
H. hete viridis., sp. nov. (1). IMinus elongatus; minus nitidus ; Isete viridis, 
antennis palpis (his exempli typici plus minusve carentibus) pedibusque flavis ; 
capite confuse nec grosse ruguloso baud foveolato ; protborace sul>quadrato postice 
leviter angustato vix cordato, sparsius punctulato, mquali; elytris seriatim minus 
crebre punctulatis, interstitiis angustis sat lequalibus sat plains. Long. 1^ 1. 
Lat. I 1. (vix). 
The bright gras.s-green colour of this species, together with its yellow legs and 
the even surface of its prothorax, will prevent its confusion with any other 
described Australian Hydrochus. 
Ellery Creek. 
OCHTHEBIUS. 
O. novicins, sp. nov. (1). Sat latus ; minus nitidus; niger, vix lenescens, 
femoribus tibiisque rubs; capite prothoraceque fort iter ina^qualibus vix perspicue 
punctulatis ] elytris leviter striatis, striis distincte punctulatis interstitiis lequalibus 
sat planis. Long. 1 1. Lat. f 1. 
Very distinct from the only previously described Australian Ochthebius 
(O. australis., Blackb.) by its larger size, less nitid surface, and much less strongly- 
impressed elytral striai. Its head and prothorax are almost exactly like those ot 
the European O. exsculptus, MiilL, except in their surface being less nitid and the 
