Ecological and Behavior Notes 15 



female also was placed in the same vial, where the mating 

 was repeated. 



Agenoideus humulis Cress. [S. A. Rohwer]. This was 

 found at Creve Coeur Lake, September 30, in possession 

 of a spider, Epeira glohosa Keys [N. Banks]. The 

 spider was so helpless that only with a magnifying glass 

 could its pulsations be detected, and five days later it was 

 quite dead. 



Ancistrocerus capra Sanss. [S. A. Rohwer]. This was 

 feeding on goldenrod down by the river at Wicks, Sep- 

 tember 16, 1919, and one specimen was captured at Hem- 

 atite, Mo., on October 19. 



Ancistrocerus campestris Sauss. [S. A. Rohwer]. A 

 specimen of this species was taken on October 27, 1916, 

 at Clifton Terrace, 111., feeding on the nectar of the few 

 remaining flowers of white aster. This wasp has been 

 found nidificating in discardod mud nests of Sceliphron 

 caementarium. 



Eumenes fraternus Say. [S. A. Rohwer]. We have no 

 records of the building of the nest of this wasp, but this 

 note will give one phase of the work. On August 13, 

 at 4 p. m. we found a nest at the edge of the field, attached 

 to the stem of an aster plant, about four feet from the 

 ground. The nest when we found it was complete, but 

 uncovered, and the tail of the last caterpillar protruded. 

 This was taken and identified by Mr. S. B. Fracker as 

 Omphalocera dentosa. The completion of the provision- 

 ing took some time, for on the next morning and also the 

 day following, nothing more was done to it, but on the 

 third day at 5 p. m. we found the little pot had been 

 filled and sealed. (See Plate V fig. 1.) 



A five-potted nest was found in St. Louis in 1917 ; four 

 pots were on the upper side of a petiole of a leaf and one 

 on the under side. The occupants had already emerged. 

 I believe that these delicate little clay receptacles of the 

 potter wasps cannot withstand the rigors of the winter, 

 but that they disintegrate under the severe weather. 



