238 



In contrast to the concealed stigma of the pro- 

 thorax those of the abdomen are fully exposed on the 

 exterior. The latter are smaller, being only about.07 

 mm. in their longer dimension and are too minute to 

 permit of the entrance of an adult Tarsonemus. These 

 further lead into a very short tube passing directly into 

 large air sacs, and as has been mentioned above, it 

 does not appear that Tarsonemus woodi is adapted to 

 live in the larger spaces of these. 



