34 A MONOGRAPH OF THE AUSTRALIAN MKMnilACIDjE, 



related to the subfamily Menibracuut, but the exposed sides of 

 thescutellum place it outside of that group. 



E u T R Y o N I A, gen.nov. 



Head triangular, recurved, ocelli above a line passing through 

 the centre of eyes, equidistant from each other and the eyes. 



Prothorax elevated into a convex, dome-shaped form, above 

 which rises a very high, strong, erect process, laterall}'- compressed, 

 dilated at the apex in a \'ery large transverse, cylindrical process 

 which is deeply sulcate in the middle, anterio-posteriorly, and 

 armed on each side with a directly diverging long, very acute 

 spine; at the middle of this process, posteriorly, is a large tuber- 

 osity, below which is a large gibbosity; some distance behind the 

 lateral angles the prothorax is suddenly narrowed, and produced 

 into a long, slender, sinuous, acuminate process, the apical half 

 distant from the abdomen, the apex reaching tips of tegmina, 

 curving downwards. 



Tegmina coriaceous, opaque, ferruginous; costa punctured; 

 corium with two discoidal cells, the exterior triangular, the interior 

 oblong, petiolate, and about twice larger, destitute of a transverse 

 venule between two ulnar veins, near base; clavus gradually 

 acuminate, with two veins. 



Wings vitreous, with four apical cells. 



Tibiae with the anterior and middle pairs dilated. 



Type, Centrohis inonsfrifh', Walk. 



Dedicated to Mr. Henry Tryon, the Queensland Government 

 Entomologist, who kindly placed this and other interesting 

 material in my hands for study. 



*E MONSTRIFERA, Walk. 



(Plate i., figs. 10, 11, 22 and 26). 

 1858, Centrotus monstrifer, Walk., Ins. Saunds. Horn. p. 80. 

 1862, Oxyrhachis yonderifer, Walk., Jour. Ent. i. p. 316. 



Piceous brown, pubescent, apex of dorsal horn marked with 

 luteous, also the lateral spines, the posterior process with a broad 

 band of the same colour. 



