Some Remarks on the Abdominal Air Sacs 

 of Stenopelmatus 



EDITH m'cONNELL 



In a study of the general anatomy of Stenopelmatus some in- 

 teresting things were noticed in regard to the trat'hea\ The 

 air sacs of the abdominal region in comparison with those of 

 the locust, as described by Snodgrass '03, are more like en- 

 larged parts of the tracheal tubes and are rectangular in shape. 



A B 



.^^1 



Figure 1. Dorsal view of the dorsal tracheal air sacs of abdomen of Stenopelmatus. 

 X3. 

 A — Showing air sacs on left side with a variation in arrangement of 



anterior sacs of right side. 

 B — Lateral longitudinal trachea. 

 C — Variation in number and arrangement of posterior sacs. 



