OF NEW ZEALAND. 835 



prominent. Prothorax oblong, margined laterally, deeply sinuated 

 or constricted behind the middle ; uneven, with two indistinct dorsal 

 costas separating the deep transverse depression near the base into 

 three parts, an elongate median depression, and a fovea near each 

 side ; its punctation similar to that of the head. Scutellum small. 

 Elytra oblong, not twice the breadth, but thrice the length, of the 

 thorax; each with four double rows of punctures, the suture and 

 alternate interstices moderately acutely elevated, so that each 

 elytron appears as if tri-costate. 



Comes near No. 412, but much smaller and with less elevated 

 elytral costae. In L. costulatus (No. 412) the outer costa proceeds 

 from the shoulder but becomes obsolete posteriorly, and in a speci- 

 men recently found on the Waitakerei Eange the hind-body is 

 nearly black. 



Length, -f line ; breadth, . 



One mutilated individual, taken on the Waitakerei Eange. 



Rethusus. 



Nov. gen. 



Body sub-ovate, slightly convex, roughly sculptured, sparsely 

 pubescent. Head, including the eyes, as wide as the base of the 

 thorax, with a quadrate muzzle. Eyes prominent, coarsely facetted, 

 transversely oviform. Antennas, implanted at front angles of the 

 head, n -jointed, longer than head and thorax, basal joint stoutest, 

 second smaller than first but much thicker than those which follow, 

 joints 3-8 cylindrical, the eighth not much longer than broad, club 

 laxly tri-articulate. Prothorax about as long as broad, medially 

 dilated, constricted near the base. Scutellum rather large, almost 

 semi- circular. Elytra oblong-oval, about twice the breadth and 

 thrice the length of the thorax. Legs moderate, femora not clavate ; 

 tibia straight, gradually widened towards the extremity ; tarsi stout, 

 3-jointed, the basal joint elongate and as long as the apical, second 

 small, barely half the length of the first, its point of insertion about 

 one-third from the base of that joint, so that the basal articulation 

 is prolonged beyond the extremity of the second ; claws well de- 

 veloped, strongly appendiculate at the base. 



Differs from Lathridius and Corticaria, its nearest allies, in the 

 remarkable tar sal structure, &c. 



1485. R. pictulus, n.s. Shining, black or brownish-black, 

 the legs and four or five spots in line with the posterior femora 

 testaceous ; the extremity of the latter, the base and apex of the 

 tibiae, and the tarsal joint infuscate ; antennae brownish, the joints 

 sometimes varying in colour ; sparingly clothed with elongate, slen- 

 der, greyish-yellow hairs. 



Head rather rough, punctate, dilated just behind the eyes, its 

 muzzle nearly the same colour as the two basal antennal joints. 

 Antenna with longish, scattered, fuscous hairs. Prothorax as long 

 as broad, a good deal dilated laterally just before, and constricted 

 behind, the middle ; base and apex, but not the sides, niarginated ; 



