CNBMACANTHIDAE. 357 



Stewait Island, 5th October, 19 J 4. This is the second species now 

 kiiowii to occur there, both discovered by Mr. W. Traill, whose name is 

 attached to this one. 



3794. Mecodema mutabile sp. nov. 



Elongate, slightl}' convex, shining: black, legs and antennae piceous. 



Head and mandibles rather longer than thoi-ax and, including the pro- 

 minent eyes, as broad as it is ; occiput very distinctly and moderately 

 closely punctured, the punctation extends forward as far as the antennae, 

 but it is finer, more irregular and distant there, interocular rugae and frontal 

 striae also irregular. Thorax of about equal length and breadth, a little 

 emarginate at base and apex, its sides indistinctly crenulate, nearlv straight 

 or only slightly curved as far as the middle, curvedly narrowed behind it, 

 the base contracted, with short straight sides and lectangular angles ; disc 

 nearly smooth, its mesial groove abbreviated, basal fossae deep but not 

 elongate ; the basal region, sides, and sometimes the front distinctly but 

 irregularly punctured, in some specimens there are a few fuie punctures 

 along the middle ; lateral rims a little expanded and impressed in front. 

 Elytra oblong-oval, not thrice the length of thorax, rather broader than it 

 is at the base, moderately narrowed behind ; each with 6 dorsal, moderately 

 well-marked and pmictured striae, the 6th with deeper and more quadrate 

 pimctures ; interstices nearly plane, but especially behind, with numerous 

 irregular scratch-like marks ; 7th interstice costiform, the outer series of 

 punctures more irregular and coarser than the 6th, the sublateral smooth 

 space is costiform, the side is vertical, with many punctiform impressions, 

 the apical sculpture is rather shallow. 



Prosternum nearly smooth along the middle, its flanks distinctly and 

 somewhat rugosely pmictured, mesosternum more closely, metasternum 

 and abdomen more finely and irregularly, terminal segment transversely 

 finely striate, quadripunctate at apex. 



This species is the most common near Lake Wakatipu, and exhibits 

 much vaiiation. In some individuals the thorax has fine transverse striae, 

 in others it is almost impunctate, but the sculpture of the elytra is nearly 

 always the same. 



(J. Length, 25 mm. ; breadth, 7| mm. 



Momit Dick, Ben Lomond, Mounts Earnslaw and Alfred. Several 

 found by Mr. T. Hall between the 25th January and 17th March, 1914. 



3795. Mecodema gordonense sp. nov. 



Robust, subdepressed, nitid ; nigrescent, somewhat bronzed, legs and 

 antennae nigro-piceous. 



Head coarsely and deeply longitudinally rugose in front, irregularly 

 near the eyes, behind these very irregularly wrinkled and rather coarsely 

 punctate ; labrum medially emarginate. Thorax a fifth broader than long, 

 base and apex only slightly emarginate, gradually curvedly narrowed from 

 the front to behind the middle, considerably contracted behind, with straight 

 sides at the base, which has rectangulai' angles ; lateral margins moderately 

 crenulate, rather thick and reflexed, the channels concave and slightly 

 broader in front ; discal groove distinct, attaining the base and apex, both 

 moderately longitudinally striate, the disc rather finely irregularly trans- 

 versely striate, more deeply near the sides ; basal foveae deep, the oblique 

 impression near each slightly prominent anterior angle rather shallow. 



