Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 41, 1908
This text is also available in PDF
(5 MB) Opens in new window
– 168 –

Eutassa, gen. nov.

Body stout, subdepressed or only slightly convex, obviously pubescent.

Rostrum a third shorter than the thorax, slightly arched in front, slightly narrowed behind the antennal insertion, before the middle, moderately stout. Scape moderately elongate, gradually incrassate, attaining the front of the eye. Funiculus as long as the scape, 2nd joint nearly as long as the basal one but more slender, 3–5 obconical, laxly articulated. Club oval, large, indistinctly annulate. Thorax constricted in front, up to that point quite oviform. Scutellum small but distinct. Elytra slightly narrowed posteriorly, the base slightly curved towards the scutellum, and as wide as the middle of the thorax. Legs rather elongate, the inner angle of the tibiæ acutely mucronate, their hooks rather slender. Tarsi elongate, penultimate joint divided nearly to its base, the lobes elongate and divergent, the terminal with minute claws.

– 169 –

Female.—Rostrum of similar form, rather narrower and more finely sculptured. Underside shining, black, the terminal 3 segments rufescent; pubescence brassy, fine but distinct; evidently, but not coarsely or closely, punctate; the sutures between the front and intermediate coxæ straight, that between the basal 2 segments sinuate. Rostrum distinctly tricarinate. Metasternum and basal 2 segments of nearly equal length, the former medially grooved behind, abdomen simple.

The rostrum is as stout as that of Sericotrogus, but longer, narrowed posteriorly, and with the antennal insertion nearer the extremity. The head is shorter, and, like the eyes, more resembles Pentarthrum. Thorax broader, and constricted in front. The elytra are gradually attenuated posteriorly, instead of being narrowed towards the base, as in Sericotrogus, and the tarsal lobes are more elongate and divergent.

Eutassa comatum, Broun. 1748. Man. N.Z. Coleopt., p. 968.

Rostrum and thorax dark red and moderately shining, elytra somewhat fulvescent and glossy, legs and antennæ infuscate red, the club and tarsi slightly paler; the vestiture yellow, slender but conspicuous, legs finely pubescent, thoracic disc nearly bare.

Rostrum and head distinctly and closely but not coarsely punctured, the former more finely in front. Thorax widest just behind the middle, well rounded; disc obsoletely impressed behind, its punctuation not close, rather fine, closer and finer in front, apex nearly smooth. Elytra with somewhat indefinite sculpture, subpunctate-striate near the suture, the punctures elsewhere seriate, interstices with serial punctures and rugulose, the 3rd slightly elevated behind, the apices singly rounded; on each, between the shoulder and the middle, there is a broad shallow impression.

♂. Length, ¾ lines; breadth, quite ⅜ line.

Howick. One pair only.

E. fuscicollis, sp. nov.

Subdepressed; except the middle of the thorax, clothed with distinct yellow hairs; thorax fuscous, elytra and rostrum slightly infuscate pitchyred, antennæ and tarsi rufescent.

Rostrum subopaque, distinctly, rugosely, and very closely punctured; the punctuation continued to the slight swelling behind the eyes, pubescent there; occiput curvedly narrowed anteriorly, very minutely and densely sculptured, and with a few fine punctures. Thorax longer than broad, its sides well rounded, a good deal narrowed and contracted in front; disc unimpressed, its punctuation moderately fine, very scanty between the middle and each side, close and rugose at the sides, closer and finer near the smooth apical margin. Elytra elongate, subparallel to beyond the middle, narrowed posteriorly, the base slightly curved towards the scutellum, apices individually rounded, each slightly longitudinally impressed before the middle; they are striate-punctate; the suture and interstices have fine serial punctures and appear rugose, the 2nd from the suture thickened, somewhat elevated, and sharply bent outwards at the extremity.

Underside with distinct and moderately close punctures and yellow pubescence, basal ventral segment broadly depressed, metasternum sulcate behind, rostrum tricarinate.

More robust than E. comatum; rostrum rather longer, broader, more densely sculptured, and subasperate; the thoracic punctuation different; antennæ stouter and implanted nearer the middle.

– 170 –

Obs.—The individually rounded apices of the elytra should form part of the generic diagnosis, as it is a distinctive character amongst the Cossonidæ.

♂. Length, 2 ½ lines; breadth, nearly ½ line.

Waitakerei Range, Auckland. Unique.