— 132 — 
These are the very distinctly marked internal differences of the 
two groups. As to the external structural differences I failed to find 
any, as already stated. It only must be mentioned, that in insularis the 
third joint of the palpi is exceptionally long, of about *' of the length 
of the second, whereas in the other species it is about Уз only. This 
character, however, must be looked upon as a specific one, as it is 
impossible to separate this species into a group of its own. 
Much more suggestive is the pattern of the wings, by which both 
groups can be held apart. | 
In the insularis group the outer transverse line of the fore wings. 
is strongly bent inwardly near the cell, forming a large dark triangular 
patch at the costal margin, and the pale colouration of the outer margin 
is much contrasted with the bright dark colouration of the rest of the 
wing. The hind wing bears a dark spot on the produced angle at M.. 
In the musculus group all wings are dull-coloured, lighter at the 
outer margin, and with two light waved or dentated cross-lines. 
It seems quite evident that both these groups are to be separated 
and each to be regarded as a quite distinct genus. I should even 
suggest, that notwithstanding their external resemblance there is a rather 
considerable distance between their affinity, and, to judge by the far- 
going regression of the valvae in the first group, it is without doubt 
of a more recent origin than the musculus group. 
Gen. Zethes Каш Биг. 
The original description is as follows : !) 
» — Ailes grandes et larges, présentant un angle au milieu de 
„leur bord externe, ayant leur dessous fortement coloré, avec un crois- 
,sant plus ou moins pupillé. 
„ Corps mince proportionnément à la grandeur des ailes; peu 
,allongé, comme dans le genre Ophiusa. 
» Tete de grosseur médiocre, portant des antennes un реш 
,ciliées dans les deux sexes; les palpes forts longs, très comprimés, 
presque droits à partir du premier article; celui-ci dépassant le cha- 
„регоп de la moitié de sa longueur; troisième article moitié moins long 
„que le précédent, beaucoup plus mince, d'égale grosseur dans toute 
,sa longueur. Spiritrompe longue. 
Sole species: Zethes insularis Ram Биг. 
Eyes round, naked, without a cilia, head with a prominence on 
the front; palpi ascending, thickly scaled, second joint long and broad, 
exceeding vertex of head, compressed, third joint variable (about “/з. 
of the length of second in insularis, and about '/s in propinquus); 
1) Annales de la Société entomologique de France, 1833, p. 29. 
Revue Russe d'Entom. XII. 1912. Nel. 
