50 THE CANADIAN ENTOMOLOGIST. 



joints finely punctured ; head rounded ; wing cases slightly wrinkled. 

 Color, mahogany brown, the wing cases and other anterior parts darker. 

 Cremaster a series of short hooks extending out laterally, fastened into 

 the lining of the thin cocoon. Duration of this period from 269 to 275 

 days. 



The eggs from which the larvae upon which the above observations 

 were made were received from Mr. C. F. McGlashan, of Truckee, Cali- 

 fornia. They were deposited July 6th, 1885, reaching me the 12th, just 

 as the young larvae emerged from them. This gives the egg period 6 

 days. This would give us a total from the egg to the moth of 296 days. 

 This would give ample time for a second brood, as from the egg to pupa- 

 tion only consumed 27 days of the 296, and add to that 14 days, the 

 usual pupal period of a great many of our moths. But it is quite proba- 

 ble that in its home in the Sierras these periods would be considerably 

 lengthened out, so that the moth would not emerge from the chrysalids 

 till some time in June, instead of from the 2nd to the 6th of May, as these 

 did, as it is generally known that heat accelerates the growth of insects, 

 and that cold retards the same. In the case of Leptarctia Lena, I find an 

 exception to this general law, however. 



The food plant of this insect is willow. In pupating, the larva 

 fastened its cocoon closely against the side of the box (made of soft pine), 

 some of the fibre of the unplaned board being woven into the outer part 

 of the cocoon. The cocoon was thin, firm and tough. 



NOTES ON SPECIES OF LEPIDOPTERA. 



BY AUG. R. GROTE, A. M., BREMEN, GERMANY. 



A. Observations on the Larvce of certain Bombyces. 



I. Dryopteris rosea Walk. 



The full grown larvc^, in the beginning of July, feeding on Viburntun 

 acerifolinm, the " Maple-leafed Arrow-wood," * are, in their last stage, 

 olivaceous brown, pale dorsally ; dorsal line single, dark; a triangular 



* The plant was determined for me by Mr. A, Pettingill, to whom I am indebted 

 for more specimens. 



