152 Journal New York Entomological Society. [Voi. x. 



the thorax to the middle of the sixth segment is occupied by the 

 stomach. Here the circular muscles are smaller than around any 

 other part of the canal. The stomach epithelium is arranged in 

 regular folds with nests of regenerative cells between them. The 

 stomach was found to be infested with Gregarinidae which closely re- 

 sembled the young Clepsidrina figured in Bronn's Klassen und Ord- 

 nungen.* The intestine extends to the middle of seventh segment. 

 Its epithelium is arranged in six longitudinal ridges or cushions with 

 thinner parts alternating. The cells of the cushions and their nuclei 

 are large. The rectum occupies the remaining segments. The inner 

 walls are much convoluted except in the last segment in which they 

 are quite straight Its epithelium is made up of very large cells. 



In late larval stages the metamorphosis of the stomach may be ob- 

 served. The epithelium is cast off entire and is seen lying in the cen- 

 ter of the canal. In its place there has developed a very even and 

 thin epithelium. The six cushions again appear in the intestine as do 

 also the large cells in the rectum. 



The malphigian tubules enter the alimentary canal near the point 

 where the stomach passes over into the intestine. They are six in 

 number and extend in many loops through every segment of the ab- 

 domen. 



The salivary glands occupy a conspicuous place in the internal 

 structure of the larva. They extend through the greater part of the 

 abdomen, lying in three main loops. Throughout the thorax they ap- 

 pear as two straight tubes lying under the alimentary canal. Between 

 the subcesophagal and the first thoracic ganglion of the nervous system 

 they pass below the nerve cord. The glands unite at the base of the 

 labium and open as a single tube. In this part lies the apparatus for 

 shaping the silk, which is minutely described by Lucas, in the work 

 referred to above. A smaller pair of glands is found in the head, 

 lying folded under the oesophagus. 



The nervous system of this larva is very simple. Professor Klap- 

 alek speaking of Trichoptera in general says there are eleven ganglia 

 besides those of the head. In this larva ganglia were found in only 

 six of the abdominal segments, making a total of nine besides the sub- 

 resophagal and supracesophagal ganglia. Whether this is an exception 

 to the general rule or whether the preparations were defective, is im- 

 possible to decide. 



* Bronn's Klassen und Ordnungen des Thier-Reichs, Vol. I, PI. 35, Fig. 9. 



