660 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XX. 



hairs, whilst in Hydrcecia and the allied genera the larv&e bore in the stems 

 and roots of various plants. 



The genera Periyea, Bryophila and a few others come very close in 

 structure to the sub-family Erastriance as regards the development of 

 vein 5 of the hindwing, the former resembling Amyna and the latter 

 Lithacodia, the essential difference m the sub-families being that the 

 larvse of the Acronyctince have all the prolegs fully developed, whilst 

 in the Erastriance the first or first two pairs are more or less aborted. 

 Key to the GENERA. 



A. Fore wing without an areole. 



a. Forewing with vein 7 stalked with 8'9 

 a 1 . Frons with pointed corneous process . . 

 b 1 . Frons with slight rounded prominence 

 c 1 . Frons without prominence. 



a 2 . Forewing with the termen angled at middle... 

 b~. Forewing with the termen evenly curved. 



a?. Forewing with vein 9 absent 



b 3 . Forewing with vein 9 present 



b. Forewing with veins 8, 9, 10 stalked, 7 from cell. 

 a 1 . Frons with transverse corneous plate 

 b 1 . Frons smooth 



B. Forewing with areole. 



a. Frons with long trilobate process and corneous 



plate below it 



b. Frons with truncate corneous prominence with 



raised edges. 

 a 1 . Abdomen with dorsal crests on basal segments. 

 a~. Proboscis aborted minute. . 

 b 2 . Proboscis fully developed.. 

 b 1 . Abdomen with dorsal crest at base only. 

 a 2 . Prothorax with spreading crest. 



a 3 . Hindwing with vein 5 from middle of disco- 



cellulars 

 b 3 . Hindwing with vein 5 from below middle of 

 discocellulars 

 b 2 . Prothorax without crest. 

 a 3 . Frontal prominence large. 



a i . Mesothorax with paired crests . . 

 b*. Mesothorax without crests 

 b 3 . Frontal prominence very small . . 

 c\ Abdomen without dorsal crests. 



or. Frons with beak-shaped process from lower 



edge of prominence . . . . . . Cytocanis. 



Pachylepis. 

 MicrapatetiM 



Neopistria. 



Cingalesa. 

 Arboricornis. 



Xantholepis. 

 Borbotana 



Mudaria. 



Cetola. 

 Seudyra. 



Cataineeia. 



Hypoper iyea . 



Iambiodes. 



Apocalymnia. 



Thalatha. 



