350 [November 



Costa straight, apex obtuse, subreetangular. The secondaries in the $ 

 hardly reach to the tip of the abdomen. 



Length of body, S .60, $ .42; exp. wings % , 1.47, 9 , 1.22 inch. 



So difficult is it to discover the specific diiferences in the imago of 

 this and allied genera, which are chiefly those of size and structure, 

 that this description, so meagre, must remain imperfect until additional 

 species occur. 



Though no typical Psychidae are known to inhabit the New England 

 and Middle Atlantic States, I have seen in the possession of Prof. 

 Townend Grlover, of the Maryland Agricultural College, some beautiful 

 drawings illustrating the transformations of a Florida species, allied to 

 the European and above mentioned Californian genus. 



THYRIDOPTERYX Stephens. 

 Thyridopteryx ephemeraeformis Stephens. 



Sphinx ephemcroeformis Haworth, Lep. Brittanica. (1810). 

 Thyridopteryx ephemerceformis Steph., 111. Br. Ent. Haust. II. p. 387. (1834). 



Walk., Cat. Lep. Br. Mus. IV. p. 000. (1855). 

 Morris, Synopsis Lep. N. Amer. p. 142. (1862). 

 I refer to this species, a % specimen in the Harris collection, proba- 

 bly received by him from Pennsylvania. It is fuscous and brown, the 

 under side of the head and thorax, and the upper part of the fore femora, 

 are pale yellowish. The body is brown. Abdominal tuft yellowish 

 white beneath and on the sides. Wings fuscous ; costa brown ; three 

 transverse oblique nearly opposite rows of brown spots on the nervules 

 of the fore wings; the third row is composed of but two spots, the lower 

 being near the internal angle, while the other forms the discal disco- 

 loration. Fringe paler on the nervules. Internal margin of the hind 

 wings brown, remainder nearly transparent. 

 Length of body, .40 ; exp. wings, .80 inch. 



Thyridopteryx nigricans n. sp. 



Another species of the same size as the preceding is in the collection 

 of Mr. Sanborn. It is nearly black. Head beneath and the middle 

 femoral tufts and under side of the tip of the abdomen are yellowish 

 white. Base of the primaries mottled with fuscous. Fringe fuscous 

 brown. 



This specimen was raised by Mr. Sanborn from a cocoon received 

 from the Middle States, I believe. The moth appeared in February, 

 having been kept in a warm room. 



