1863.] 
183 
Ps. lichenatus, n. sp.—-Brown. Head with the nasus often pale yellowish 
brown; antennae shorter than the wings, with the basal half of each joint whit¬ 
ish except towards their tip, those of more robust and with long and dense 
cinereous hairs, those of J more slender and but slightly hairy. Thoraai gene¬ 
rally paler on the sutures. Legs pale yellowish brown, the tibiae and especially 
the femora dotted with brown. Front wings brown, with a long triangular 
hyaline spot, its apex next the costa, extending from the disk to the interior 
margin, another at the costal apex, and a third on the terminal margin, the 
two last leaving a brown parallelogram between them one-third as wide as the 
wing. Veins the color of the wing, marked on the brown portion, except to¬ 
wards the base, with a row of pale dots placed on one side of them. Pteros- 
tigma brown, three times as long as wide, its widest part § of the way to its 
tip, with a dark dot at its basal end, and the angle next the disk regularly 
rounded. Hind wings, as well as their veins, subhyaline. Length to tip of 
wings 3—3J millimetres. 
Five % , seven 9 . Occurred in the autumn, on some precipitous 
sandstone clitfs, in great numbers. 
Ps. bifasciatus, n. sp. ? 
Differs from quietus Hagen, {=se7nisfriatus Walsh,) in the veins 
being coarser and blacker, in the pterostigma being cinereous with a 
large irregular black spot at the interior angle which is rounded, in 
the vein closing the discoidal cell being white not black or fuscous, in 
the existence of a faint white spot at the origin of the branch of the 
1st sector, (or first discal bifurcation,) and in there being always two 
distinct narrow nebulous fasciae on the basal half of the front wing. 
The size is also one-fourth larger. Length to tip of wing 5 mill.; 
alar expanse 9 mill. Three 9 •—In the whiteness of the vein closing 
the discoidal cell, and in the white spot on the 1st sector, this species 
agrees with Ps. noDse-.scotise, which however is much larger, and has 
the interior angle of the pterostigma very acute and the wings spotted 
on their terminal half. Traces of the white markings of the wing-veins 
occur in some specimens of semistriatus, and I am not certain that this 
is not a mere variety of that species. The fasciae are the only strongly 
marked character that divides them. From confounding a single spe¬ 
cimen with semistriatus^ the dimensions I have assigned to that species 
are one millimetre too great. Ps. striatus Hagen, differs in the pte- 
rostignia being “ acute,” (by which I understand that the interior, or 
as it is often called, the “posterior” angle is acute,) and in other 
respects. 
Ps. PERPLEXUS Walsh. I have now two additional specimens, taken 
