1863.] 
55 
small, lighter than the rest of the wing with a black mark in the cen¬ 
tre. There is a humeral spot limited by an oblique line and a costal 
darker shade near the apex from whence the transverse posterior line 
traverses the wing to the internal margin. 
I have described one new species and regret not to have been able 
to identify L. Doubledayi Gruenee. 
No American species of Gymatophora are known to me and 1 have 
not identified Mr. Walker’s C. caniplaga from Canada. 
To the second section belong the genera Gonophora^ Thyatyra and 
Laciuia. It is this section which has been classed among the Noctui- 
na by some authors chiefly on account of a superficial resemblance 
which the species present to the genus Pluda. This is seen more par¬ 
ticularly in our native species. The resemblance is however accident¬ 
al and a study of the pterogostic characters show the intimate relation¬ 
ship of this second section with the species of the first and the correct¬ 
ness of their present classification. 
The genus Gonopbora^ separated from Thyatyra by Bruand, has 
been suppressed by M. Gruenee and the species on which it was found¬ 
ed reunited to Thyatyra^ and this course has been generally followed 
by continental authorities. In the present paper I have retained this 
genus, following Mr. Walker in this respect, as the study of our native 
species has led me to believe the separation justified and the genus as 
it stands well constituted. 
I have separated from Thyatyra^ T. cymatophoroides Gn., and a con¬ 
stant variety of that species, expultrix m., and propose for them the 
following genus:— 
LACINIA nov. gen. 
Antennae moderately long, stout, simple in both sexes. Proboscis 
short. Palpi porrect, extending beyond the head, third joint short, 
moderately slender; second densely pilose. Anterior wings straight 
along the costa, somewhat depressed at the tip. Exterior border very 
convex, curving inward near internal angle which is furnished with a 
well developed spur. Apex acute, internal margin much shorter than 
costal. Abdomen moderately stout, extending well behind the hinder 
wings especially in the male in which it is furnished with tufts of hair 
along the sides and underneath. 
In this genus the costal nervule of the inferior wings shows a great¬ 
er upward curve beyond the point of its contiguity with the subcostal, 
