300 KANSAS UNIVERSITY SCIENCE BULLETIN. 



held the branch above and with its mandibles it griped the leaf 

 which was attached to the branch between its fore legs. This 

 was taken July 6. 



Two others of this species were taken the next week in 

 Trego county. One was flying along the dry bed of an inter- 

 mittent stream and the other was taken on the leaves of a 

 solitary cottonwood tree. This species was observed on two 

 other occasions during the summer— once by Mr. Williams, on 

 August 2, in Osborne county, flying over a prairie hillside. 

 On the other occasion, August 26, in Norton county, I noted 

 Eumenes bolli take water at a stock tank in an open pasture. 

 She did not alight directly on the water, but on a sunflower 

 leaf floating in the tank. 



Three jug-shaped nests of Eumenes were found during the 

 summer. The first was found by Mr. Williams on July 24, in 

 Russell county. This nest was in a ravine, attached to a 

 branch of Onosmodium molle, about eighteen inches above the 

 ground. The nest had apparently been built and then de- 

 serted. A second nest I found on August 8, in Rooks county, 

 in a ravine, attached to a branch of Euphorbia marginata. 

 This nest had a circular opening in its top — not through the 

 mouth of the jug — from which the wasp had evidently 

 emerged. The next day I found a third nest, attached to a 

 twig of Rhus canadensis, about two and one-half feet above 

 the ground. This shrub was growing on the side of a sand 

 dune. From this third nest a male Eumenes bolli emerged 

 August 28. One of these nests was within 50 yards of water. 

 The other two were each about 400 yards from water. 



Nests of Eumenes have previously been described by others 

 as jug-shaped cells. The cells of E. bolli were like shortened 

 jugs, which, not considering the mouth, were nearly globular. 

 The side which was attached to the more or less upright plant 

 stem was somewhat flattened. The flaring mouth opened near 

 the middle or above the middle of the side opposite the point 

 of attachment. The diameter of the jug varied from one-half 

 to nine-sixteenths of an inch. The entrance in the mouth was 

 three-sixteenths of an inch in diameter. On the exterior of 

 the jug were small rounded ridges and some rounded promi- 

 nences, showing how the layers of earth had been added by 

 the potter. However, the surface was smooth, not granular. 

 These nests are made of earth, but I have thought that some- 



