Lepidoptera of tlie Amazons. 49 



79. Letis marmorides. 



?. PJiulcea {JVoctua) marmorides, Cramer, Pap. 

 Exot. i. p. 25, pi. 16, fig-s. E, F (1779). 

 On board the Yeamiaba, 26tli August, 1874. 



Not previously in the Museum Collection : it is allied 

 to the preceding species and to " Brujas'''' maculicoUis ; 

 it may possibly be an extreme variety of L. occidua, ? . 



80. Letis integra. 



Letis integra, Walker, Lep. Het. xiv. p. 1273, 

 n. 24 (1857). 



Syrnia letiformis, Guenee, Noct. iii. p. 158, 

 n. 1549 (1852). 

 Mouth of liio Jutahi, 18th January, 1875. 



If Syrnia be a distinct genus from Letis, which I doubt, 

 the difference exists in its shorter and more strongly-den- 

 ticulated Avings, which, in fact, are the only distinctions 

 pointed out by M. Guenee ; it therefore stands to reason 

 that ISyrnia letiformis is an anomaly. The species is 

 nearly allied to Letis xylia and />. scops ; Syrnia mineis 

 is also a Letis. 



81. Letis alauda. 



L^etis alauda, Guenee, Noct. iii. p. 154, n. 1543 

 (1852). 

 $. On board the Yeamiaba, 17th August; Manaos, 

 22nd December, 1874. 



This species is new to the National Collection ; it is 

 somewhat nearly allied to the preceding, but much larger, 

 and the female is broadly clouded with testaceous, this 

 colour occupying the whole central area of the secondaries. 



82. Letis Trailii, n. sp. 



? . Allied to the preceding species, but much darker, 

 with the markings more shai'ply defined ; fuliginous-broAvn, 

 irrorated with stramineous ; wings crossed in the centre 

 by six parallel dentate-sinuate dark-brown or black lines, 

 the area enclosed by which is wholly testaceous in the 

 secondaries, so as to form a broad central belt, but only 

 the external border of which is testaceous on the primaries; 

 basal area of ]n-imaries crossed by two irregularly undu- 

 lated pale-bordered blackish lines; a white costal spot 

 beyond the cell, between which and the apex are three or 



TRANS. ENT. SOC. 1879. — PART I. (apR.) E 



