LAMETIA.—RIVULA. 443 
One specimen of this interesting species was captured by Mr. Herbert Smith in 
April 1888. On the underside Z. anemolia closely resembles Thermesia gemmatalis, 
Guen. 
MYRTALE, gen. nov. 
Male. Head and thorax rather broad; the abdomen slender, about one-third longer than the wings, and with 
a tuft of hair on each side close to the base. Eyes prominent. Proboscis very short and slender. Palpi 
large, erect; the first joint short and rather stout; the second joint long and slender, excepting at the 
end, where it is flattened, and thickly tufted with hair; the third joint very minute, hardly extending 
beyond the tuft of hair at the apex of the second joint. Antenne short, simple. Legs slender, not thickly 
clothed with hairs, the spurs rather long. The primaries rather long and narrow, the costal margin 
slightly curved, the outer margin rounded; the secondaries broad, much rounded from the apex to the 
inner margin above the anal angle, the inner margin near the base thickly clothed with long hairs. 
The female differs from the male in having the palpi simple and quite small, and the legs more sparsely 
clothed with hair; the tufts of hair at the base of the abdomen and on the inner margin of the secondaries 
are also entirely wanting. 
Type Myrtale imitata. 
This genus is not closely allied to any other known to me; the palpi are in some 
respects formed like those of Lametia. 
1. Myrtale imitata, sp.n. (Tab. XXXVI. figg. 6, 64,3; 7,2.) 
Male and female. Primaries brown, clouded from the base along the inner margin and across the middle of the 
wing to the costal margin with silvery-grey, and with a large silvery-grey spot on the outer margin just 
below the apex; secondaries blackish-brown, paler at the base and along the inner margin; the fringe of 
both wings pale brown: palpi and front of the head pale brownish-fawn-colour, the collar and base of 
tegule reddish-brown; the thorax and base of the abdomen pale greyish-white, the rest of the abdomen 
blackish-brown, the anal tuft fawn-colour; the legs reddish-brown. The female is altogether slightly 
darker in colour than the male. Expanse, ¢ 13, 2 144 inch. 
Hab. Panama, Chiriqui (Ridbe, in mus. Staudinger) —Sovutu-East Brazit, Rio Janeiro. 
This insect is an exact mimic of Perigea palpalis, Walk.; in fact, it is almost 
impossible to distinguish the females of these species from each other. There is a 
specimen of MV. imitata from Espirito Santo in the National Collection, where it is 
placed in the Limacodide, near the genus Scopelodes, by Mr. Butler. It seems to me, 
however, to be better assigned to the Deltoide, but its exact position is at present very 
doubtful. The example from Rio Janeiro in my own collection is considerably paler 
in colour than those from Chiriqui. 
Subfam. HERMINIINA. 
RIVULA. 
Rivula, Guenée, Sp. gén. des Lép. viii. p. 47 (1854). 
Guenée founded this genus upon the common European R. sericealis, and also 
included in it a North-American species. Two are now added from our region. 
3 kk 2 
