the Australian Longicornia. 541 



tliorace baud riigoso, latere tuberculis duobus elongatis 

 instructo, elytris vix costatis. 

 Port Denison. 



Narrower than the last, and differing in other respects ; in the 

 ochraceous colour, with a few paler spots, in the absence of the 

 white patches on the elytra, the absence, or nearly so, of punctures, 

 the slight or almost obsolete costse, and the smaller, nearly tri- 

 angular scutellum. 

 Length 6 lines. 



Genus Zygocera. 

 1. Zygocera luguhns. 



7i, nigra, pube nigra cinereaque tecta ; prothorace lateribus 

 conico, disco mutico ; elytris oblongis, bi-apiculatis, basi uni- 

 tuberculatis, nigris, medio apiceque cinereis nigro-maculatis. 



New South Wales. 



Black, with a short black pile varied with ashy ; head ashy, with 

 black stripes in front and at the sides ; antennae black, the third 

 and intermediate joints slightly ashy at the base; prothorax 

 conical at the side, a deeply impressed line near the posterior 

 margin, and another less marked anteriorly, the disc not tuberous 

 and very obscurely marked with ashy ; scutellum rounded behind, 

 black, bordered with white ; elytra much broader than the prothorax 

 at the base, with a single tubercle and an elevated line on each, 

 the sides slightly rounded, the apex with a small spine at the 

 suture, and a large one externally, the basal portion and an irregu- 

 lar patch behind the middle black, the rest dull ashy, with black 

 spots ; body beneath glossy black, the pectus varied with ashy, 

 and an ashy patch containing a single spot on each side of the 

 four basal segments of the abdomen ; legs black, obscurely ringed 

 with ashy ; tarsi ashy, with' the last two joints and claws black. 



Length 5 — 6 lines. 



Every one of the species of this genus, except Zygocera ccenosa, 

 which is unknown to me, is very distinct, and there would be no 

 difficulty in finding characters that would apparently justify 

 raising almost each of them to a separate genus. Still there are 

 certain similarities that appear to lead from one species to another, 

 although it must be admitted that it is scarcely satisfactory to 

 combine them all under one generic name, as I am disposed to do. 

 I believe Erichson (Wiegman's Arch. 1842, p. 224) is the only 

 author who has described the genus Zygocera, the one under this 

 name characterized by Mr. James Thomson (Arch. Ent. i. p. 189) 



VOL. I. THIRD SERIES, PART VU. OCT. 1863. P P 



