182 MR. r. WALKER OK SOME UNDESCRIBED 



M. metargyria. • Fam. EMPLOCIDJE. 



Fam. FIDONIDiE. Gen. Tora, n. 



Gen. IssA, n. T. nnilinea. 

 I. munda. 



Tarn. HEMICEEID^. 



Hemiceras, the typical genus of this family, is wholly American, 

 and extends from Canada to Brazil. The species here described 

 has much affinity to H. metasUgma ; but the latter has white hind 

 wings. 



Fam. HOMOPTEEID^. 



The genus Somoptera is mostly American, and the species are 

 very numerous. The two species here described are much smaller 

 than most of the others in the genus. 



Eam. CATEPHID^. 



Some of the genera included in this family are very different 

 from each other in structure. The new genus Vespola has most 

 affinity to Stictoptera and to Loplioptera, but may be distin- 

 guished by the slender and very long palpi. 



Eam. PHYLLODID^. 



Tetrisia has a remarkable resemblance to the Asiatic genus 

 Phyllodes, from which it may chiefly be distinguished by the great 

 length of the 3rd joint of the palpi. 



Tarn. EREBID^. 



The Erebidse exceed in size all the other Noctuites ; and tlie 

 South- American species are larger and much more numerous than 

 those of Asia. The Bombycites and the GTeometrites have the 

 greatest development in South Asia ; and the Tineites of Australia 

 and of New Zealand, including the Cossidae and the Hepialidae 

 far surpass all others in dimensions. 



The sameness of colouring in the wings of Briijas ligutta, and 

 the white dot near the interior angle of the fore wings, distinguish 

 it from JB. hasicincta, JB. JBengus, and £. posterior. Letis securifera 

 has most resemblance to L. oecidua, from which it is chiefly dis- 

 tinguished by the testaceous patch on the interior angle of the 

 fore wings, and by tlie fewer markings on the hind wings. 



The white fringe of the wings and the more angular hind wings 

 distinguish Si/rnia alhifimhria from S. Ipliianassa. 



