74 



XX. On the Natural Characters of Four Genera, 

 zc'hich have been confounded under the hiamt 

 Silpha. 



SILPHA. 



Synopsis Generum. 



1. Necrodes. Corpus elongato-ovale. Thorax orbicu- 



laris. Eliftra apice oblique truncata. Ai^tcnnce 

 gradatim cxtrorsum crassiores. 



2. OlCEOPTOMA. Corpus ovale. Thorax fere semicircu- 



laris transversus, antice emarginatus. Elytra in- 

 tegra (foemina^ saepe emarginata). Antennce cla- 

 va abriipta. 



;J. Sir.PilA. Corpus o\di\e. Thorax semicircularis antice 

 truncatus. FAijtra Integra. Antennce gradatim ex- 

 trorsum crassiores. 



4. PllosPHUGA. Corpus ovale aut subroiundum. Thorax 

 semicircularis postice abrupte truncatus. Ely- 

 tra Integra. AnteniKS articulis tribus ultimis 

 priecedentibus abrupte crassioribus. 



Syxonyma Generum. 



Gen. I. Necrodes. 



Necrodes. JVilkin Mss., Leach*. 

 Sil])ha 1. littoralis, &c. 



* Zool Misc. 2. 87. 



