the Australian Longicornia. 549 



most nearly the apex, the fourth or outer costa terminates gradu- 

 ally in it ; body beneath with a greyish-fulvous pubescence ; pro- 

 sternum expanding posteriorly ; legs short, fore tibiae somewhat 

 curved, anterior coxae shortly spined ; last tarsal joint long and 

 robust ; claws simple. 

 Length 4 lines. 



Genus Isalium. 

 Caput exsertum, antice productum, prothorace angustius. An- 

 tenncB mediocres, ? elongatse, S articulo basali obconico, 

 intermediis apice unilateraliter dilatis. Prothorax subcylin- 

 dricus, lateribus muticis. Elytra elongata, parallela. Pedes 

 mediocres, femoribus subclavatis. 

 This genus is proposed for the reception of certain species 

 hitherto placed with Didymocantha, but from which they differ in 

 their elongated muzzle, antennae, unarmed prothorax, and other 

 characters. Sirongylurus scutellatus, Hope, is the type, and it in- 

 cludes Didtjmocantha thoracica, Pasc, D. cylindricollis, Pasc, and 

 probably Coptopterus cretifer, Hope. 



Genus Phoracantha. 

 1. Phoracantha fallax. 

 P. robusta, fusca ; prothorace subquadrato, rugoso-punctato, 

 tuberculis tribus nitidis, lateribus spinoso ; elytris flavo-tri- 

 maculatis, apice bispinosis. 

 Sydney. Adelaide. 



Robust, dark-brown ; head coarsely punctured, a lightly im- 

 pressed line between the eyes ; antennae as long as the body, pu- 

 bescent, the third to the sixth or seventh joints, inclusive, spined ; 

 prothorax opaque, subquadrate, about equal in length and breadth, 

 coarsely and confluently punctured, with three distant, shining 

 tubercles, a short sharp spine at the side ; scutellura triangular, 

 pubescent ; elytra gradually narrowing behind, coarsely punctured 

 at the base, each with two spines at the apex, and three yellow 

 patches, one in the middle, one between it and the base, and a 

 third directly before the outer spine ; body beneath chesnvit- 

 brown, finely punctured, the abdomen pubescent and nearly im- 

 punctate ; palpi and legs ferruginous, the latter with a close grey 

 pile. 



Length 10 lines. 



Phoracantha qidnaria, Newm,, differs from this species in having 

 no tubercles on the prothorax. It must be borne in mind that 



