Thyatiridae 



Genus PSEUDOTHYATIRA Grote 



(i) Pseudothyatira cymatophoroides Guen^e, Plate XL, 

 Fig. 2$, 6 . 



Form expultrix Grote, Plate XL, Fig. 26, i . 



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 



(i) Euthyatira pudens Guenee, Plate XL, Fig. 23, ^ . 



Form pennsylvanica Smith, Plate XL, Fig. 24, ? . 



The moth emerges in the VQxy 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 I'.bout 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 Hiibner 



(1) Bombycia improvisa Henry Edwards, Plate XL, Fig. 



27, 3. 



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.— Za/Zi? Rookh. 



304 



