298 Transactions. 



which is broad and, cordiform and medially concave in front in a reversed 

 Now Zealand specimen, but more deeply concave and sublunate in one 

 from the Kermadec Islands. Metasternum between the middle and hind 

 coxae hardly longer than the 2nd ventral segment, which, at the sides, is 

 but little shorter than the basal one ; 3rd and 4th together quite as long as 

 the 2nd. The mentum projects half-way into the buccal cavity, where 

 the porrect 4-jointed palpi are clearly discernible. 



Female.- — Rostrum rather longer and more slender, subparallel, shghtly 

 dilated at the base. Scrobes well defined, starting just before the middle, 

 and without any trace of subapical prolongation. Scape more slender and 

 flexuous. 



In my genus Nothaldonus the rostral canal is deep throughout and 

 extends into the cavernous mesosternum, the sharply elevated borders of 

 which are in contact with the anterior coxae. The mentum is broader 

 and the rigid palpi more prominent. The tarsal vestiture is more scanty, 

 and the eyes more finely faceted. (See page 1235, Man. N.Z. Colept.) 



Aldonus hylobioides, White. 



Piceous, the derm slightly nitid, covered chiefly with greyish-yellow 

 scales, but with a large lateral area behind the middle, and other ill-defiiied 

 spots, bearing dark-fuscous squamse ; legs and antennae more or less piceo- 

 rufous. 



Thorax closely rather coarsely and rugosely punctate, usually with a 

 slightly raised smooth line along the middle ; its sides moderately rounded 

 but nearly straight though slightly narrowed behind, the apex only half 

 the width of the base ; it is broader than long. Elytra with indefinite 

 sculpture, consisting apparently of 7 dorsal striae or series of oblong punctures 

 on each, the striae more distinct behind ; interstices uneven and asperate, 

 usually with small granular elevations intermingled with the squamae ; 

 they are slightly wider than the thorax at the base, with prominent 

 shoulders ; their sides are more or less gradually narrowed backwards, 

 and cover the abdomen. 



Legs with variegated scales and setfe, these latter finer and more hair- 

 like along the inside of the tibiae than those along the sides of the body. 



Underside shining pitchy-black, irregularly and rather coarsely punctured, 

 the yellowish scales thicker near the sides than along the middle, the ter- 

 minal ventral segment rufescent and closely punctured. 



Male. — Rostrum with longitudinal sculpture, subcarinate and grooved 

 behind, punctate in front, more or less squamose. 



Female. — Rostrum shining, reddish, finely punctured but appearing 

 smooth. 



Length (rostrum exclusive), 2|— 5i Hues ; breadth, 1-2 J lines. 



Sunday Island. 



Mr. Wallace states that the insect is common in rotten karaka and other 

 timber. Having examined about twenty specimens, I have drawn up a 

 more modern description than the original one. The subsequent discovery 

 of allied genera in New Zealand renders redescription necessary. 



Group CossoNiD^. 

 Pentarthrum gracilicorne, sp. nov. 



Subdepressed, sparingly and minutely pubescent, moderately nitid ; 

 thorax nigrescent, its apex of a metallic coppery hue ; elytra, legs, and 

 rostrum piceo-rufous ; the antemiae and tarsi paler red. 



