194 



Targioni-Tozzetti, are elucidated, with some corrections to the 

 last named author. 



Under the head of organs accessory to the intestinal canal, 

 the author announces the discovery of salivary glands, and it is 

 to an exact exposition of the anatomical and histological nature 

 of these organs that a large portion of the article is devoted. 

 The organs in question have been previously seen and de- 

 scribed, but, from a want of exact topographical and histological 

 knowledge, have been incorrectly assigned to the nervous sys- 

 tem. The salivary glands are found to exist in the Aphidae as 

 well as in the Coccidae, and in both families have the same 

 general plan of structure. A pair of sack-like, more or less 

 extensively lobed glands, placed over the mouth-parts, and 

 flanking the suboesophageal ganglion, are traversed each by an 

 excretory duct, arising by a varying number of finely punc- 

 tured tubes, and passing forward and downward to unite with 

 its fellow of the opposite side to form a short stem ; the latter 

 empties directly into the oesophagus at its initial end. 



Another organ, thought to be a second salivary gland, of 

 somewhat different function, is found to exist in certain of the 

 Coccidae (Aspidiotus and Chionaspis). 



The Malpighian vessels are very briefly considered. 



The article is illustrated by three colored plates drawn by 

 the author. Edward L. Mark. 



Notes on Attaci. 



Telea Polyphemus. Larva feeds upon birch, oak, elm. maple, 

 hazel, cherry, walnut, willow, linden. I should think that the 

 fact of its feeding upon willow might be of value to any one 

 who intends to raise silk, for willow is' easily cultivated and 

 grows rapidly. From May 25 to July 15. 



Actias Luna. Larva eats birch, oak, walnut, hop hornbeam, 

 chestnut. I once found a small birch tree in Weston nearly 

 stripped by Luna larvas. I counted them carefully, and found 

 that there were no less than forty-five. With this exception, I 

 have never found more than five or six on one tree. Full 

 grown larva? vary very much in size. In the Can. Ent., vol. 

 vi, p. 86, Mr. Gentry describes a variety of the larva in which 



