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Show 142 PROF. J. O. WESTWOOD ON N E W EXOTIC MOTHS. [Jan. 4, by the fall of a tree, their habit being to sit with the wings open (flat?) on the tops of young leaves, then to take a slow flight round the clear space without fluttering the wings, and to settle again at the old Fig- 1. Wings of Castnia erycina. place, whence, after remaining for a few minutes, they set off again for another round. He only found the species in this one spot, although there were plenty of similar open spaces caused by fallen trees in the neighbourhood. The flight of all the Castnice is generally very rapid; but in this one it is just the reverse, and they were very easy to take either sitting or flying. He never took more than one any day ; and sometimes for two or three weeks they seemed to disappear, when suddenly one would be found in the same spot and on the same tree. Genus SATURNIA, Fabricius. S A T U R N I A ARNOBIA, sp. nov. (Plate XII. fig. 2.). S. alis anticis apice subacutis, posticis rotundatis, omnibus fttlvis fusco slrigosis ocelloque medio, parvo, rotundato, vitreo, fusco cincto,fere ejusdem magnitudinis oi'natis; anticis fascia parum undulosa inter basin et ocellum, altera submedia per ocellum currente, marginem internum attingente, tertiaque magis obliqua ad apicem alarum extensa et cum priore ad marginem internum connexa ; alis posticis fascia media fusca a medio marginis analis fere ad marginem costalem {pone medium ejus extensa), parti superce ocelli insidente, strigaque undulosa fusco-rufa inter ocellum et marginem spatio inter strigam ex- |