SILK-PKODUCING AND OTHER EXOTIC BOMBYCES. , 247 



cannot, I think, be of any use. On the contrary, the envelope 

 covering the true cocoon of the hybrid Roylei-Pernyi is very 

 small, and leaves no space between the envelope and true cocoon ; 

 it is almost like that produced by Pernyi. I therefore consider 

 the creation of this new hybrid a valuable acquisition to 

 sericiculture, if a sufficient quantity of cocoons has been secured, 

 so as to continue the propagation of the species. The larvse of 

 my new hybrid are almost similar to those of Pernyi. Further 

 information will be given on the rearing of Roylei-Pernyi in 

 my next report, when I shall have been supplied with full 

 particulars. 



Leaving the silk-producers, I shall say a few words on two 

 American Bombyces reared for the first time in England, and 

 these under glass in the house, — Orgyia leucostigma and Cerato- 

 campa imperialis. 



Orgyia leucostigma. — Eggs of this species, which were unknown 

 when found by my correspondent, were sent to me from Madison, 

 Wisconsin, and I received them on December 29th, 1880. They 

 hatched on May 27th, 1881; the larvse, which refused to eat the 

 species of maple I offered them, were most successfully reared on 

 oak. The larvae of this species, which are very beautiful, were 

 exhibited with other larvse at one of the meetings of entomologists 

 at the Westminster Aquarium. I obtained pupae, moths, pairings 

 and eggs. The moth is about the same size as that of 0. antiqua. 



Ceratocampa [Eacles] imperialis. — With twenty-four pupse of 

 this species I obtained nineteen moths from the 21st of June to 

 the 19th of July, and two pairings; five pupse died. The pupte 

 are large, and armed with sharp points at all the segments. The 

 moths are from four to six inches in expanse of wings, of a bright 

 yellow, with large patches, and round spots of reddish brown with 

 a purple gloss ; besides these patches and round spots, the wings 

 are covered with small dark dots. The male moth is much more 

 blotched with brown than the female, and, although of a smaller 

 size, more showy than the female. The two pairings took place, 

 the first from the evening of the 13th till the morning of the 14th, 

 the second from the evening of the 15th till the morning of the 

 16tli of July. The ova commenced to hatch on the 81st of July. 

 Eggs large, about the size of those of Yama-Mai, Pernyi, or 

 Mylitta, rather flat, and concave on one side ; they are of an 

 amber-yellow colour, and transparent, like those of Sphingid®. 



