1871.] 261 [Grayson. 



skin of the caterpillar at the anus, tearing away the internal 

 membranes from their attachment at that part ; the larva is 

 then placed on a piece of blotting paper, and rolled out with 

 a lead pencil from the head backwards, the contents of the 

 bbdy being thus expelled. A fine tube is then to be inserted 

 in the anal puncture and confined there by thread. A sand- 

 bath is to be made, consisting of an argand chimney or simi- 

 lar tube inserted in a larger metal cylinder of the size of a 

 tomato can and the intervening space filled with hot sand. 

 This apparatus may be placed upon a hot stove or above 

 a lamp or gas jet. Thus the inside of the chimney forms a 

 hot-bath, in which the skin of the caterpillar, tied to the 

 tube, is thrust ; the empty skin is now to be inflated by the 

 breath, and frequently revolved, continuing the inflation 

 until it is perfectly dry. ? The skin so prepared may be 

 pinned and placed in the cabinet. 



Mr. W. H. Dale presented over fifty pinned specimens of 

 insects collected by him in Florida. 



June 7, 1871. 



Vice President R. C. Greenleaf in the chair. Twenty-two 

 persons present. 



Dr. T. M. Brewer presented the following paper: — 



On the Physical Geography and Natural History of 

 the Islands of the Tres Marias and of Socorro, off the 

 Western Coast of Mexico. By Col. Andrew J. Grayson. 

 Edited by Geo. N. Lawrence. 



In a paper published in the Annals of the Lyceum of Natural 

 History of New York, Vol. x, Feb., 1871, I stated that it was my 

 intention to publish a catalogue of all Col. Grayson's collections 

 made in Northwestern Mexico, together with those of some others. 

 Since then it has been thought best to give separate lists of the birds 



