LETIS. 369 
wings much marked with white lines. The female example received from Nicaragua 
has more white on the secondaries than any of the others I have seen, An individual 
of the same sex not quite so pale as this, from the Amazons, was supposed by Mr. Butler 
to be a different species and described by him as ZL. trailii; the two other specimens that 
came in the same collection, and which were identified by Mr. Butler as the sexes of 
L. alauda, are both females, one of them being darker than the other; on the under- 
side these three examples show very little variation, and upon comparison with the 
underside of the male it will at once be apparent that they are the same sex of one 
species. Specimens from Trinidad are slightly darker in colour in both sexes and also 
rather smaller, but in other respects they agree with those from South America. 
An example from Jamaica does not differ from others from Ecuador. The locality 
“ Chili,” given by Guénée for LZ. alauda®, requires confirmation, as we have no other 
evidence of the genus Zeéis being represented in that country. 
2. Letis falco. 
Letis falco, Moschl. Verh. zool.-bot. Ges. Wien, 1880, p. 4251; Beitr. zur Schmett.-Fauna von 
Surinam, ii. p. 46’. 
Hab. Panama, Chiriqui ! 2.—Gutana, Paramaribo ! 2. 
This species is quite unknown to me; it was described by Méschler from two males 
and four females from Paramaribo and one female from Chiriqui. 
3. Letis mycerina. 
Noctua mycerina, Fabr. Sp. Ins. ii. p. 210; Mant. Ins. ii. p. 185. 
Phalena Attacus mycerina, Cram. Pap. Exot. ii. p. 115, t. 172. f. B’. 
Syrnia mycerina, Hiibn. Verz. bek. Schmett. p. 273. 
Letis mycerina, Guén. Sp. gén. des Lép. vii. p. 1507; Walk. Cat. xiv. p. 1265°; Moschl. Verh. 
zool.-bot. Ges. Wien, 1880, p. 423*; Beitr. zur Schmett.-Fauna von Surinam, iii. p. 45°. 
Letis nycteis, Guén. Sp. gén. des Lép. vii. p. 150°; Walk. Cat. xiv. p. 1265”. 
Letis atricolor, Guén. Sp. gén. des Lép. vii. p. 151°; Walk. Cat. xiv. p- 1266°; Méschl. Verh. zool.- 
bot. Ges. Wien, 1880, p. 423"; Beitr. zur Schmett.-Fauna von Surinam, iii. p- 45%. 
Letis abrupia, Walk. Cat. xiv. p. 1272”. 
Hab. Muxico, Cordova (Riimeli), Jalapa (Schaus); Guatemata, Coban (Conradt), 
Panzos, Volcan de Atitlan 2500 to 3500 feet (Champion); Honpuras (Dyson); Cosra 
Rica (Van Patten, in mus. D.); Panama, Volcan de Chiriqui 2000 to 3000 feet (Cham- 
pion), Chiriqui (Arcé, Fibde)—ConomBia; VeEnezueta!2; Ecuapor; Guiana, ‘Suri- 
nam 13451011, Cayenne 2°; Brazin2; Wuxsr Coast oF AMERICA? 9; Amazons, Para 9; 
ANTILLES, San Domingo 37 8 9, 
This insect is found over a very wide range of country, from Mexico to South Brazil, 
and also extends to the West Indian Islands. It varies very much, but it does not 
appear from the large series of specimens before me to be at all constant in any one 
locality ; the darkest form is that from San Domingo, but even from that island several 
BIOL. CENTR.-AMER., Heter., Vol. L., February 1890. 3 aa 
