Longicornia Malay ana, 441 



Femora sublinear. 



Head with an infra-ocular pro- 

 cess (^) Pasco'ea, White. 



Head normal Sphingnotus, Peir. 



Femora clavate Polyxo, Thorns. 



Prothorax without a submarginal 

 spine. 

 Third joint of the antennae 



scarcely longer than the scape .Mneside, Thorns. 

 Third joint of the antennae much 



longer than the scape Arrhenotus, Pasc. 



Prothorax without a lateral margin. . . . Tmesisternus, Latr. 



Arsysia. 

 Trigonoptera, Perroud, Ann. Soc. Linn. Lyon, ii. 336, 

 Caput antice subquadratum, fronte bicarinata ; tuberibus an- 

 tenniferis brevibus, remotis. Oculi tenue granulali, medi- 

 ocres, emarginati. Antennae corpori aequales vel paulo 

 longiores ; scapo subcylindrico, modice elongato ; articulo 

 tertio scapo longiore, curvato ; sequentibus gradatim de- 

 crescentibus, ultimo recto. Prothorax ampliatus, utrinque 

 dente minuto instructus. Elytra trigonata, humeris la- 

 minato-productis, lateribus abrupte deflexis, apicibus trun- 

 cato-mucronatis. Pedes validi ; femora fusiformia; tibicB 

 anticse rectae, posticae caeteris paulo longiores ; tarsi aequales, 

 breves. Prosternum elongatum, latum, in emarginatione 

 mesosterni receptum. Mesosternum dilatatum. 

 There is a genus of Fishes, Trygonoptera of Miiller and Henle, 

 anterior by some years to M. Perroud's name Trigonoptera* 

 Although the two are not identical, they are so in sound. I 

 do not myself, however, consider this ought to be an abso- 

 lutely valid objection, but there is so determined a stand in some 

 quarters against all names that are only nearly alike, that I have 

 thought it the least of two evils to make the change now, before 

 any more new species are added to the genus, rather than leave 

 it to no distant future when the name Trigonoptera would be 

 certainly sunk. This genus was considered by M. Perroud to 

 be near Megabasis, with which it has nothing more in common 



* Trigonopteryx has been used anteriorly for an orthopteroiis genus ; recently 

 it has reappeared under the form of Trigonopterus, for one of the Staphy- 

 linidce. 



