450 ; ; HETEROCERA. 
The primaries are long and narrow at the base; the costal margin is almost straight, but is slightly 
curved just before the apex ; the inner margin is quite straight ; the outer margin is considerably rounded 
from the apex to the anal angle. The secondaries are rather large; the costal margin is quite straight to 
the apex ; the outer margin is very much rounded ; the fringe is very short. 
The female is very similar to the male, but the eyes and antenne are smaller; the second and third joints of 
the palpi are long and very slender, the third joint tapering to a very fine point ; and the fore legs are 
not pilose. 
Type Mamerthes nigrilinea. 
Allied to Simplicia, Guen., but with the palpi of the male shorter, and those of the 
female longer and more slender ; other minor differences are mentioned above. 
1. Mamerthes nigrilinea, sp.n. (Tab. XX XVII. figg. 1, 1a, 4; 2,2.) 
Male. Primaries darkish brown, the costal margin yellowish-brown, a small black spot near the base of the 
cell, and a large one at the end of it, beyond which the wing is crossed from the costal to the inner 
margin by a very distinct waved black line, a number of yellowish-brown points between the black line 
and the outer margin, the outer margin edged with black, the fringe dark brown; secondaries dull 
brown, crossed from the costal to the inner margin by a very faint dark brown line; the underside of 
both wings pale brown, thickly irrorated with dark brown scales, and crossed beyond the middle by two 
waved brown lines, a large black spot at the end of the cell of the secondaries: head, thorax, abdomen, 
and legs dark brown, the anal tuft yellowish-brown; the antenne pale brown; palpi with the first 
joint dark brown, the second joint bright yellowish-brown, the third joint and the large tufts of hair 
darker brown. The female considerably darker in colour than the male, with the antenne finer, the 
palpi differently formed, and the legs without hairs, Expanse, g 9, 13 inch. 
Hab. GuatTeMaLa, Volcan de Atitlan 2500 to 3500 feet (Champion); Panama, 
Chiriqui (Trdtsch, in mus. Staudinger), Volcan de Chiriqui 2000 to 4000 feet (Cham- 
pion). 
A very distinct species. Six examples—one, a male, from Guatemala, the others, 
all females, from Chiriqui. We figure both sexes. 
NICETAS, gen. nov. 
Allied to Mamer thes, from which it differs in the slightly shorter primaries and more rounded secondaries. 
The palpi of the male are broader and a little longer, those of the female being almost similar; the 
antenne are rather long and very deeply pectinated in the male (only slightly ciliated in Mamerthes) ; 
the abdomen is long and slender, and extends beyond the hind wings. 
Type WMicetas panamensis. 
1. Nicetas panamensis, sp. n. (Tab. XXXVII. figg. 3, 30,3; 4, 2.) 
Male, Primaries dark brown, with a greyish shade extending along the costal margin and crossing the wing 
beyond the middle to the inner margin, a spot about the middle of the cell and one at the end of it very 
dark brown, the wing crossed from the costal to the inner margin by four very fine waved yellowish- 
brown lines which are edged with black on the inner side, the marginal line black, the fringe dark brown; 
secondaries dull brown, paler at the base and along the costal margin, crossed from the costal margin to 
the anal angle by two faint brown waved lines, the marginal line black, the fringe brown; the underside 
uniform pale brown, both wings crossed by two dark brown waved lines, the fringe paler than on the 
upperside: head, thorax, and abdomen dark brown, the anal tuft yellowish-brown; the palpi large, 
rather broad, and clothed on the inner side with a large tuft of very pale yellowish-brown hairs; the 
antenne about half the length of the primaries, brown, and rather deeply pectinated ; the legs pale brown, 
