1274 COLEOPTERA 



three times longer than broad, the other is placed further from the 

 suture, begins in line with the hind thighs, and is twice the length of 

 the first. 



Male. Antenna} long, fourth joint about one- third shorter than 

 third, fifth one-third longer than third, the seventh joint reaching 

 the extremity of the body. 



$ . Length, 6 ; breadth, 1-| lines. 



Tairua. One example. 



OBS. In my specimens of D. sublineata the eighth antennal 

 joint of the male attains the extremity of the body. The dark elytral 

 streaks commence before the middle, where they unite, so as to 

 appear furcate ; the pale vein-like marks are present. Beside the 

 two frontal discoidal elevations on the thorax there are two less 

 distinct ones near the base ; the longitudinal space (nearly lateral) 

 between these is nearly smooth. If these do not agree with the 

 type in the British Museum they must represent a new species, for 

 which I propose the name D. ornata. 



.ffimona, 

 Newman. 



(Sharp; Trans. Roy. Dub. Soc., 1886, p. 436.) 



Though this is one of the oldest and best know 7 n of the New 

 Zealand Longicorns, until recently only one species w T as recognised. 

 I have for some years been aware that there are several species, 

 though I have not previously been able to understand them ; but, as 

 I have now recognised that the peculiar sexual differences in the 

 sculpture of the thorax seen in other genera of the subfamily 

 Cerambycides exist in a marked form in this genus, I am able to 

 arrange satisfactorily the specimens at my disposal. According to 

 this character there are two groups, distinguished by the prosternal 

 sculpture in the male sex ; and I may mention that it appears that 

 this is correlative with a well-marked difference in the concealed 

 internal supplementary abdominal segment of this sex. In all the 

 species yet discovered the females have the flanks of the prothorax 

 impunctate, while in the other sex they are punctate. 



Sect. 1. Prosternum without true punctuation in the male and 

 female. 



2243. JE*. humilis, Newman. (Sharp ; Trans. Hoy. Dub. Soc., 

 1886, p. 436.) This species is of slender form, with the elytra a little 

 attenuate behind, the thorax deeply furrowed by transverse rugae, 

 and, when the pubescence is removed, quite shining; the femora 

 and the scape of the antennae are infuscate externally. The two 

 sexes are extremely similar, but the male has the flanks of the thorax 

 punctate, and the antennae slightly longer than those of the female. 

 The dorsal plate of the supplementary internal segment is in the 

 former sex infuscate at the tip and emarginate ; the female has this 



