Vol. XXlv] ENTOMOLOGICAL NEWS 397 



empty cell (No. 3), but it emerged again very soon after the 

 cage became light. This experiment was repeated from 6 tn 

 6.30, but the wasp could not be fooled into going to bed the 

 second time. 



The insect continued to use this cell (No. 3) for its retreat 

 until 5 P. M., June 7. The next morning at 8, it was occupy- 

 ing cell No. i, having migrated from No. 3 during the night: 

 at 1.30 P. M. it was occupying No. 2. June 9 until noon it 

 again occupied No. i. It flew about all the afternoon and 

 probably all night for the next morning it was still active. At 

 10 o'clock the insect and cage were placed in intense sunlight. 

 By n the wasp cowered in the only shade that the cage af- 

 forded, that made by a small string tag bearing the cage num- 

 ber. This ticket was then removed to compel the insect to re- 

 main in the bright sunlight. It moved about slowly, however, 

 and in forty minutes I found, to my surprise, that it was dead. 



In keeping Pclopoeus caementarium of both sexes in con- 

 finement I have never observed them to enter their old cells, 

 much less to remain there for hours. 



A Wasp and her Nest. 



A Pclopoeus (Sceliphron (Pclopoeus) caementarium} was 

 discovered making her nest in an open soap box which stood 

 on end partly facing an open window about three feet distant. 

 Through this window the wasp made her entrance and exits. 

 A roll of carpet on the floor extended into the box, barely 

 touching the bottom, which now served as the back wall. On 

 this wall just beneath the carpet was hidden the nest in course 

 of construction, which now had two cells. The nest was first 

 found by following the wasp. While the little builder was 

 gone I pulled the carpet out about six inches. The carpet wa> 

 undoubtedly associated in the wasp's mind with the location of 

 the nest, for when she returned she was in an extremely con- 

 fused state for about twenty-five minutes ; much of this time 

 she spent in examining the rug. It was necessary for me to 

 leave without knowing whether she found the nest, but upon 

 examining it two days later I found a third cell completed and 

 the mother filling it with spiders. 



