July, 1841.] 57 



Written Communications. A letter was read from Mr. J. 

 G. Anthony, in reference to the shells presented by him this 

 evening, with a proffer of further services. 



A letter was also read from Prof. Del Rio, of the city of 

 Mexico, enclosing a communication from Mr. Joseph Mur- 

 guitro, describing a new mode of mining and blasting rocks. 

 Referred to a committee consisting of Messrs. Chaloner, 

 Booth and Lukins. 



Dr. B. H. Coates stated that Miss Morris had seen a Tipu- 

 lide fly in the act of placing her eggs on or in a grain of 

 wheat. This fly and these eggs she had in good preservation. 

 On comparing it with Le Sueur's drawing, she could see no 

 difference, except that the antennae were not quite so long, and 

 that the small nerves of the wings were more clearly defined 

 and strongly marked. She had also found a flaxseed pupa in 

 the cavity of the straw, with no hole, crack or visible mark 

 where the larva could have entered. This pupa she has exa- 

 mined with a microscope, and she can detect no difference in 

 it from that on the outside. This too she has carefully pre- 

 served. 



These important facts and specimens may, in the conviction 

 of Miss M., either prove her previous views correct, or that 

 there are two species of this destructive pest. 



Mr. Phillips submitted the following memorandum, which 

 was read and ordered to be printed in the Society's proceed- 

 ings. 



In consequence of inquiries from different persons of the date of 

 publication of the papers in the early volumes of the journal of this 

 Institution, I have searched for the numbers as published with 

 their original envelopes, bearing the date of the month of publica- 

 tion, and have been so successful as to find a complete series. As 

 the covers of the numbers are thrown aside by the binder, and very 

 few sets of the journal remain in their original form, I have pre- 

 pared a list of the dates, in order that naturalists may be at no loss 

 9 



