10 
MYSTROCEPHALA; LET ABA. By Dr. M. Draui?t. 
mummia. 
Icucotelus. 
semiviridis. 
elaeina. 
off inis. 
leuconoe. 
pulverosa. 
postica. 
albiceps. 
colombiana. 
aguirrei. 
ovata. 
spadicea. 
Isabella. 
E. mummia Cr. (= discreta WJcr.) (lg) is similar, but much smaller; the white postdiscal spot of 
the forewing is only indicated by white striation of the veins proceeding from the cell-end, and the hindwing 
shows the somewhat diaphanous white discal spot veined black. From Venezuela, Guiana and Brazil. 
E. leucotelus Wkr. (= serpentinum Fldr., juanita Schs.) (5 b) is not to be mistaken for any other 
species owing to the white apex of the forewing. The hindwing is quite black with snow-white fringes. From 
Mexico, Colombia and Peru. 
E. semiviridis Drc. ( 1 g) is easily distinguished from the very similar leucodiscci by its plain, ciliated 
antennae, the white disc of the hindwing being veined black besides. From Bolivia and Peru. 
E. elaeina Zerny (5 b) is much smaller and stouter than the preceding, the large, purely white post- 
cellular spot on the forewing is merely indicated by a somewhat creamy, light patch and bluish-white dusting 
of the veins on the olive-green ground. Hindwing creamy-white with a blackish-brown costal margin and border 
extending to the base of the wing. Numbers of it were taken by Fassl on the Rio Songo in Bolivia. 
E. affinis spec. nov. (5 b) greatly approximates elaeinar, it has a large, white postdiscal spot outside 
and below broadly bordered with olive-green, the costal margin remaining broadly white; the rest of the forewing 
is purple -blackish, densely strewn with violettish-grey scales forming an indistinct dentate antemarginal line; 
on the middle of the proximal margin there is a black-marked, almost square spot of the ground-colour, on 
all sides bordered by olive-green ; the ring-shaped and reniform maculae are green, the latter parted by white. 
Fringes towards the proximal angle white. Hindwing blackish-brown with grey, at the tips white fringes. Body 
black, on the head and thorax mixed with white hair; abdomen beneath and laterally from the 2nd to 5th ring 
orange. 1 $ Rom the Rio Songo (A. H. Fassl). 
18. Genus: Mystrocephala H.-Schdfj. 
This genus is chiefly distinguished from the allied genera by the veins rising from the upper cell-angle 
of the hindwing being petioled; on the forewing the upper subcostal vein proceeds from below the cell-angle. 
The palpi are bent downward; the antennae are somewhat expanded behind the middle, with short pinnae 
in the $. Thorax and tibiae are roughly haired, the abdomen, however; smoothly scaled. 
M. leuconoe Fldr. (5 b) is recognizable by the tripartite or quadripartite whitish oblique spot on 
the purple-brown forewing and the yellow hindwing with black veins and a black marginal band. Colombia. 
M. pulverosa Rothsch. (= postica Wkr. pr. p.) (1 i) is similar, but the oblique spot of the forewing 
is not parted by black veins. Panama, Venezuela. 
M. postica Wkr. ( — clavigera Wkr., aeruginosa Wkr., quadrimacula H.-Schdjf.) (1 g). Deep red- 
brown on the anterior body and forewings, on the latter with a round, creamy-white postcellular spot; hindwing 
yellowish-white, broadly veined black, with a black marginal band, the $ is without the black stripes towards 
the proximal margin. Brazil. 
M. albiceps spec. nov. (5 b) is very similar, but easily discernible by its creamy-white hindheacl, 
collar and shoulder-covers. The Hindwing only exhibits a narrow, club-shaped, creamy-white spot. The legs are 
externally covered with long, creamy-yellow hair, the 2nd and 3rd abdominal ring laterally and the under 
surface of the anal tuft are orange. 1 from Muzo (Colombia) (A. H. Fassl). 
M. colombiana Hmps. (lg) differs from postica by the longer oblique spot of the forewing and the 
small and black-dustecl postcellular spot of the hindwing in the which is exhibited by the $ only beneath. 
The ventrum of the shows light yellow bands. Colombia. 
M. aguirrei Berg (lg) is easily discernible from all the others by the small white spot above the 
middle of the proximal margin; the postdiscal oblique spot is somewhat strangulated; on the blackish-brown 
forewing dusted with greyish-white a red colour spreads from the base through the middle of the wing to the 
border on which it extends as a narrow stripe up to the apex. Hindwing dark brown. Argentina. 
M. ovata Rothsch. (= unipuncta Schs.) (1 h). Deep chocolate-brown, densely strewn with yellowish- 
white with a small oblique spot on the forewing. The unicolorously blackish-brown hindwing with apically white 
fringes shows beneath white stripes on the costal margin, median and inner-marginal vein. Brazil to Argentina. 
M. spadicea Fldr. (1 e) is deep red-brown with a long, narrow, yellowish oblique spot on the forewing 
and orange anal hairing. Common in Colombia, Bolivia, Ecuador and Peru. 
M. Isabella Dogn. (1 i) is similarly marked, but it has a light brick-red ground-colour of the forewing; 
the hindwing is somewhat more yellowish. Ecuador. 
19. Genus: Lietaba Dyar. 
Forewing with an accessory cell; forelegs without spines. Frons with a stunted, conic projection. Thorax 
and abdomen without tufts. Eyes large, round. Frontal projection short, in front flattened, with scarcely 
bossed margins; palpi oblique, thickly scaled, with a short terminal joint. Founded on 1 species discovered 
by Mr. Robert Muller in Mexico in 1909. 
