92 WASP STUDIES AFIELD 



H. T. Townsend], Phorbia sp. [F. Knab], Phormia regina 

 Meigen [C. H. T. Townsend], Psilopus sipho Say [F. 

 Knab],La7fa sp. [C. H. T. Townsend], Emphanopteryx 

 euniyothyroides Townsend [C. H. T. Townsend], Sarco- 



FIG. 22. Cells of Hypocrabro stirpicolus, having the remains of the 

 feast and the cocoon in one cell. 



dexiasp. [C. H. T. Townsend], Achaetoneura sp. [C. H. T. 

 Townsend], and Solva (Xylomya) pallipes Loew, [F. 

 Knab] . 



Since this species is elsewhere known only to use brambles 

 for a nesting-place, it is indeed surprising that this one 

 should have so skillfully adapted the old tunnels in the log 

 for her use. In the stalks, of course, there is no lateral 

 space for individual variation in the nest; so it is all the 

 more remarkable that in this exceptional nest so much good 

 adaptation was applied, by making cells ramifying from 

 one main burrow. Furthermore, this nest was constructed 

 horizontally, while all other nests recorded have been in 

 upright stalks. 



On one occasion an elder twig was broken off and ex- 

 amined for twig-dwelling insects, but it was unoccupied. 

 In less than five minutes we passed by this spot again and 



