ISELY: EUMENID^ OF KANSAS. 301 



thing besides water — perhaps saKva — must be mixed with 

 the earth to insure the permanence of the nests through vari- 

 ous kinds of weather. 



Eumertes fraternus Say. 



A two-celled nest of E. fraternv^ was found by C. H. With- 

 ington on a dogwood branch, March 6, 1909. At the time the 

 nest was taken it contained full-grown larvae. Two female 

 wasps emerged May 10, 1909. The nests and wasps, with an 

 explanatory note, were placed in the Snow collections. 



The cells of this ne.st were two earthen jugs attached to 

 each other so that one lateral wall served for both. They were 

 similar in shape and size to the nests of E. bolli, but were 

 flattened beneath where they were attached to the horizontal 

 branch of dogwood. While alike in general plan, these nests 

 showed considerable variation in structure. One was higher, 

 more covex above and more nearly round ; the other was con- 

 siderably larger. One nest was placed with its long axis at 

 right angles to the direction of the branch ; the other obliquely 

 to it. 



Eumenes sp. 



A jug-shaped cell, somewhat like those of 0. bolli, was 

 brought to me by Will H. Collins, a student of entomology at 

 Kansas University, October 21. This nest he had found at- 

 tached to the upper surface of a flat stone, in a wood about 

 three miles south of the University campus. The lower side 

 of the cell, where it was in contact with the stone, was much 

 flattened. Otherwise it was similar in appearance to the nest 

 of E. bolli. Two reperesentatives of this genus have been taken 

 in Douglas county — E. fraternus and E. smithi. 



Summary. 



I shall now summarize some of the data that can readily 

 be grouped. 



Eumenidas are friends of plant life. The adult insects are 

 to a certain extent flower pollenizers. From Mr. Hartman's 

 observations on 0. dorsalis we learn that the adults sometimes 

 also take animal food for themselves. The food of the wasp 

 grubs, as far as is known, is exclusively plant-feeding larvae 

 of other insects. Some of these larvje preyed upon are obscure 

 species, making the work of wasps that prey upon them neutral 

 so far as economic importance goes. There are many other 



