MYELOIS PJNGUIS. 241 



generally less than an inch, and mines more of a 

 chamber than a gallery; as it grows it enlarges its 

 original small round hole of entrance, which even- 

 tually becomes of a size sufficient for the escape of 

 the moth ; but there are always a few long black 

 grains of frass blocking the entrance. This frass is 

 characteristic, and should be looked for when search- 

 ing a tree, on any projecting bosses as well as on the 

 spreading foot, upon which it sometimes falls and 

 lodges; for stray grains of frass detected below afford 

 a good clue to the situation of the mine above. 



Of three larvse I received on the 13th of July, 

 1877, two were quite small and feeding slowly, while 

 one was full-fed ; and this, when safely extracted from 

 the piece of bark for the purpose of depicting, was 

 soon afterwards induced to enter a goose-quill, where 

 it chose to remain and spin its cocoon, enabling me to 

 watch its progress through the transparent medium 

 during a day and a half, when it became quite 

 opaque. 



On the 22nd of July other pieces of ash bark, con- 

 taining a pupa and a larva not quite half-grown, 

 arrived from the same kind friend, and this larva 

 lived on as long as I could keep the bark fresh and 

 edible ; but it died during the autumn, having made 

 scarcely any additional growth while in my keeping, 

 although after the first inspection I did not again 

 disturb it, for at that time, after clearing away the 

 frass to ascertain the exact direction of the mine, I 

 noticed that in a few minutes afterwards the entrance 

 was again blocked up with more frass by the larva 

 within. 



In 1876 Dr. Wood found a full-fed larva at the end 

 of May, and bred the moth on the 8th of July follow- 

 ing ; and in 1877, on the 19th of July, he found a 

 pupa and three young larvas not half grown. Of the 

 two moths I bred myself, the first was a female from 

 the pupa within the before-mentioned quill on the 2nd 



VOL. IX. 16 



