BY H. J. CAKTEK. 537 



Two specimens, from the Melbourne Museum, show the most 

 beautiful species of the genus in its brilliant metallic contrast of 

 two colours. The colouration is much as in Chd'iothes Besti 

 Blackb., except that the colours of the pronotum and el3^tra are 

 reversed. It is the only metallic (non-black) species belonging 

 to Gebien's 2nd section "with short mesosternum." The larger 

 specimen is, I think, $ from its enlarged penultimate tarsi. I 

 find no other sexual character. Type in the National Museum, 

 Melbourne. 



Omolipus angustus, n.sp. 



Whole upper surface bright blue, nitid, underside darker blue: 

 antennae, legs, and underside of head reddish, upper surface of 

 femora blue. 



Head closely punctate on epistoma, more sparsely and closely 

 on forehead, rounded in front, epistomal suture rather indistinct: 

 antennae with apical 4 joints wider than the rest, 8-10 sub- 

 spherical, 11 widely oval, twice as long as 10. Prothorax 2*5 x 3 

 mm., very convex laterally, widest at middle, con- 

 siderably narrowed anteriorly, slightly so pos- 

 teriorly, strongly produced forward in the middle 

 at apex, base truncate, anterior sides depressed and 

 without angles, posterior angles widely obtuse with- 

 out previous sinuation, sides moderately rounded, 

 disc closely but not deeply punctate. Scutellum 

 transverse, oval, reddish. Elytra subcylindric, of 



same width as prothorax at base and less than ^ °" ' 



^ 0. angustus. 



twicg as long, sides slightly widening behind pro- 

 thorax, apical declivity moderate, lateral margins not evident 

 from above; striate-punctate, the stride clearly cut throughout, 

 the punctures therein small and close, intervals slightly convex 

 and nearly smooth, with a few sparsely scattered microscopic 

 punctures; abdomen minutely punctate, with a row of larger 

 punctures at the apex of each segment; underside of head and 

 presternum slightly rugose, prosternal intercoxal process very 

 small and not produced. Dimensions, 8x3 mm. 

 Hab.— Cue, West Australia (Mr. H. W. Brown). 



