448 COLEOPTERA 



sides, indistinctly constricted in front, where it is narrowest, the sides 

 behind being not at all contracted ; the surface is very coarsely punc- 

 tured, with an ill-defined, smooth, slightly-elevated, dorsal line. The 

 elytra are sub-cordate, their base, and that of the thorax, of equal 

 width and broadly emarginated ; the apex rounded, somewhat produced ; 

 each bears five discoidal furrows, which are broad and very coarsely 

 punctured ; the interstices are elevated, comparatively narrow, and, 

 owing to the encroachment of the punctation, rather irregular. Abdo- 

 men coarsely punctate. Tarsi comparatively small. The rostral suture 

 in this species is not perceptible. The general outline of this species is 

 quite unlike that of the typical form, but I can see nothing which should 

 exclude it from this genus. 



Length, i line (rost. excl.). 



I found three specimens adhering to a log, at Whangarei Heads ; 

 the colour of both so much alike that the insects could hardly be seen. 



Group ERIRHINID^E. 



Under-/*/z with a distinct peduncle. Mandibles variable. Ros- 

 trum more or less slender and elongate, cylindrical or nearly so ; its 

 scrobes often distant from the apex, linear, rectilinear or oblique, and 

 reaching the eyes. Antenna of variable length ; their funiculus with 

 five or eight joints, the seventh nearly always free. Pro thorax very 

 rarely furnished with ocular lobes, scarcely ever bisinuated at its base. 

 With a scutellum. Tibice slender and rounded among the greater num- 

 ber, often mucronated or spurred at the extremity ; corbels of the hind 

 pair open : tarsi variable, their claws very seldom connate. Meta- 

 sternum more or less elongated. Mesothoracic epimera small or mode- 

 rate. Body nearly always winged and pubescent. 



PMlacta. 



Nov. gen. 



Antenna inserted beyond (apically) the middle of the rostrum, they 

 are elongate and slender ; scape flexuose, extending as far as the eye ; 

 funiculus of the same length as the scape, seven-jointed ; first stoutest, a 

 little longer than the second ; second nearly as long as the third and 

 fourth conjointly, and these are of about the same size as the following 

 three ; club oviform, rather stout. Rostrum elongate, arcuated, cylin- 

 drical, of nearly equal thickness throughout ; the scrobes are directed 

 backwards obliquely, so that the scape of the antenna for half its length 

 is concealed beneath the rostrum. The head is immersed in the pro- 

 thorax up to the eyes, and is bulging below ; the eyes are moderately 

 large, almost circular, slightly convex, distinctly facetted, and are placed 

 high up at the base of the snout. The thorax is comparatively small, 

 moderately convex, about as long as it is broad, with truncated base 

 and apex and rounded sides. Scutellum small, triangular. The elytra 

 are convex, obovate, twice the width and nearly thrice the length of the 

 prothorax. The legs are moderately long and stout, the fi.'tiora are not 



