238 [Aug. 1847. 



of London, dated Jan. 19, 1847, acknowledging the receipt 

 of certain Nos. of the Journal, recently transmitted at the re- 

 quest of that Society. 



From the Librarian of the Boston Society of Natural His- 

 tory, transmitting certain portions of the Proceedings of that 

 Society, at the request of the Corresponding Secretary of the 

 Academy. 



From Miss Morris, of Germantown, dated July 20, 1847, 

 addressed to the Corresponding Secretary, communicating 

 the following in relation to the Hessian fly, and to the insect 

 destructive to the Raspberry plant: 



" I have great pleasure in handing to you a box containing the 

 larvje of the Cecidoniyia, described by me in 1841, and a vial 

 with those described by Dr. Fitch. 



The difference is so marked that I think no doubt can arise in 

 the mind of any one that there are two species. 



The species in the vial were procured from New Jersey by 

 Mr. Haines, and presented to me ; from the same source I ex- 

 pect pupre from which I hope to obtain the flies in September. 



What Las retarded the earlier development of the Larvae in the 

 centre of the straw it is impossible to conjecture, but I fear now 

 they will all perish, as they have not attained more than half their 

 growth, and the straw is all dead and ready for the harvest. 



The three stems of raspberry which will accompany this, con- 

 tain the nests of a Hymenopterous insect which has troubled us 

 for some years, but whose history we were unacquainted with 

 until this morning, when I discovered them, as as you will see, in 

 the centre of the stem. In one you will find eggs, in another 

 jiupse, and a third contains both pupae and the perfect insect. 



I am not prepared to say whether it be the parent or larva that 

 causes the greatest injury, as I have not seen the worm feeding 

 on the pith, but am well assured that they are too injurious to 

 suffer them to remain unnoticed. This spring, in many of the 

 gardens in this neighbourhood, entire rows of raspberries were 

 blighted by them; it is said the worm fed on the pith, but I am 

 in doubt, as I found a worm, which I am inclined to think was 

 Lepidopterous, in their nest, but may have been a starved speci- 

 men of their own brood. 



Since writing the above, I find that the worm feeds on the pith 

 of the raspberry, and that its history is briefly this; the fly de- 

 posits its eggs in the new shoot or summer growth in the fall, and 

 the worm feeds on the pith until the following July, whea it un- 

 dergoes its transformation." 



