THE EUMENIDAE 



insects building in the face of clay banks. It is surprising 

 indeed to find one small group of individuals digressing so 

 far from the established custom of the species, yet adhering 





> 



FIG. 61. Two burrows of Odynerus dorsalis. Natural size. 



to a more or less uniform scheme of their own among them- 

 selves. As he suggests, these excavated burrows show a 

 sharp contrast to the earthen cells under a tuft of grass, de- 

 scribed by Hartman. 4 Mr. Hartman tells us, however, in a 

 letter, that he suspects that probably his species was erron- 

 eously identified for him. 



4 Bull. Univ. Texas, No. 66. 



