Thyatiridae 
Genus PSEUDOTHYATIRA Grote 
(i) Pseudothyatira cymatophoroides Guenee, Plate XL, 
Fig. 25, 6 . 
Form expultrix Grote, Plate XL, Fig. 26, $ . 
The moth, which occurs in the two forms which we have 
delineated on the plate, is a native of the northern portions of the 
Appalachian subregion. It is common in Pennsylvania. 
Genus EUTHYATIRA Smith 
(1) Euthyatira pudens Guenee, Plate XL, Fig. 23, $. 
Form pennsylvanica Smith, Plate XL, Fig. 24, $ . 
The moth emerges in the very early spring, and may be found 
where it is common, seated about three inches from the end of 
twigs in the woodlands, with its wings folded about the twig in 
such a way as to elude the observation of those who are not 
familiar with its habits. The form pennsylvanica is found in 
both sexes in every brood. It represents a curious case of 
dimorphism. 
Genus BOMBYCIA Hubner 
(1) Bombycia improvisa Henry Edwards, Plate XL, Fig. 
27, $ . 
Syn. tearli Henry Edwards. 
The habitat of the insect is on the Pacific slope, in the northern 
portions of the coast ranges. 
<< Then rapidly with foot as light 
As the young musk-roe’s, out she flew 
To cull each shining leaf that grew 
Beneath the moonlight’s hallowing beams 
For this enchanted wreath of dreams, 
Anemones and Seas of Gold, 
And new-blown lilies of the river, 
And those sweet flowrets that unfold 
Their buds on Camadeva’s quiver.” 
Thomas Moore.— La.Ua Rookh . 
3 ° 4 
