1855.] Linnean Society. 435 



Genus Arcania, Leach. Testa subglobosa, spinis seu tuberculis elevatis 

 plurimis armata. Orbita supra et extrorsum aperta. Fosscb antennariee 

 longitudinales. Pedipalpi externi caule exteriore recto, lineari, apice 

 interiore emarginato-tiuncato ; caule interiore gradatim acuminato. 

 Pedes antici gracillimi. Abdomen maris lanceolatum, segmentis a tertio 

 ad sextura coalitis. 



1. Arcania Erinaceus, Herbst. Corpore atque membris dense spinosis, 

 spinis spinulosis. 



2. Arcania ll-spinosa, De Haan. " Thorace spinuloso, spinulis obtusis, 

 ambitu 11-spinoso, spinis acutis simplicibus ; brachiis granulatis, digitis 

 manibus longioribus." 



3. Arcania novem-spinosa, Adams & White. " Thorace laevi, granuloso, 

 marginibus latero-anterioribus spinis duabus, latero-posterioribus spinis 

 duabus, posteriore spina longa recta." 



4. Arcania septem-spinosa, Bell. Testd paulo latiore quam longiore, 

 tuberculata, niargine spinis septem tuberculatis armato, laterali utrin- 

 que reliquis longiore. 



5. Arcania tuberculata, Bell. Testa paulo longiore quam latiore, omnino 

 tuberculata, margine spinis novem tuberculatis instructo ; brachiis gra- 

 nulatis, manibus lasvibus. 



G. Arcania gracilipes. Bell. Testa granulosa, tuberculis quindecim supra, 

 et tribus ad marginem posteriorem instructa ; pedibus anticis tenuis- 

 simis. 



7. Arcania Icevimana, Bell. Testa granulata, tuberculis numerosis di- 

 stinctis, ad marginem spinis novem simplicibus armata ; manibus 

 glabris. 



Genus Iphis, Leach. Testa rhomboidalis, transversa, angulis rotundatis, 



utrinque spina longissima horizontali armata ; fronte emarginato. 

 Species unica, Iphis septemspinosa, Fabr. 



Genus Ixa, Leach. Testa elliptico-rhomboidalis, processu utrinque sub- 

 cylindrico a regione branchiali producto ; regionibus sulco profundo se- 

 paratis. Orbita supra bifissa. Pedipalpi externi caule exteriore lato, 

 interiore longiore. Pedes filiformes. 



Species unica, Ixa cylindrus, Fabr. 



Read also, a " Notice of a species of Carabideous Insect, Helluo 

 (^Acanthogenys) myrmecopMlus, Westw., found together with its 

 larva, in Ants' nests in Ceylon, by G. H. K. Thwaites, Esq., 

 F.L.S." By J. O. Westwood, Esq., F.L.S. This paper was 

 accompanied by figures of the larva and imago states of the insect. 



