15° Lloyd's natural history. 



at the tips, and with the hind margin obnque and dentated, 

 and broad dentated hind-wings. They are brown, grey, or 

 blackish, with sharply defined lines and stigmata. The species 

 are rather numerous, and the pupae are subterranean. 



LETIS MAGNA. 

 {Plate C XXX I I I., Fig. 2.) 



Noctiia , Zschach, Mus. Lesk. p. no, no. 2916 (1788). 



Nodua magna, Gmelin, Syst. Nat. i. (5), p. 2544 (1791). 

 Letis aptissima, Walker, List Lepid. Ins. Brit. Mus. xiv. 

 p. 1272, no. 21 (185 8). 



Walker's description of his L. aptissima is as follows : — 

 " Dark ferruginous. Thorax, with two slight black bands. 

 Abdomen blackish ferruginous. Wings with the transverse 

 lines black, angulose, few, distinct; middle band fawn-coloured 

 exteriorly, where it contains a zig-zag black line ; sub-marginal 

 band black, bordered with fawn-colour, macular, and widely 

 interrupted on the fore part of the fore-wings ; sub-marginal 

 lunules black, distinct. Fore-wings with the orbicular and 

 reniform spots black, the former nearly round, with a ferru- 

 ginous mark in the middle, the latter somewhat D-shaped. 

 Length of the body, twelve lines; of the wings, thirty-six 

 lines." 



It is a native of Trinidad. 



GENUS THVSANIA. 



Thvsania, Dalman, Kongl. Vet. Akad. Stockholm, 1S24, 



p. 407 ; Guenee, Spec. Gen. Lepid. Noct. iii. p. 163 



(1852); Walker, List Lepid. Ins. Brit. Mus. xiv. p. 1286 



(1858). 



This genus is easily recognisable by the very long grey 



dentated wings, with blackish lines and markings. The antennae 



