20 Trans. Acad, of St. Louis 



drop back into their holes most tantalizingly upon our 

 approach. These holes' proved to be the old burrows of 

 beetles, tightly packed with sawdust. The wasps were 

 evidently enlarging their quarters by removing this' 

 packing. 



Hypocrabro texanus Cress. [S. A. Rohwer]. This wasp 

 was found in a hollow stem, together with some larvae 

 and three pellets of bee-bread. It is probable that this 

 was really the bee's home, and the wasp had merely 

 sought shelter here for the night. 



Eypocrahro stirpicolus Pack. [S. A. Rohwer]. The 

 live wasp was found in a tunnel in an ailanthus twig 

 taken in the Missouri Botanical Garden. It had evident- 

 ly only taken temporary refuge there, since there was no 

 evidence of its nest; the cells below it were filled with 

 caterpillars, while this species rears its young on flies. 

 Another stem with soft pith, taken at Wicks, Mo., con- 

 tained a tunnel which ocillated from side to side of the 

 pith area. One cell in this burrow was full of flies and 

 a wasp larva; another cell contained only the debris of 

 flies, and a partition of pith one-half inch thick sep- 

 arated the two. Early in May this young wasp emerged 

 a full-grown H. stirpicolus. Their prey in one nest was 

 Viviania calosomae Burgess [J. M. Aldrich]. A third 

 nest was found in a cottonwood sprout, which had been 

 chopped off exposing the pith. The tunnel was newly 

 completed, nine inches long and three-sixteenths inch 

 wide, and the first cell was being stocked when I inter- 

 rupted the worker. The mother was caught in the burrow 

 with three flies, all dead: Oxycera maculata Oliv. [C. T. 

 Oreene]fPhorbiafuscipes Zett. [C.T.Greene] and Rivellia 

 pallida Lve. [C. T. Greene]. In still another nest we took 

 flies of two other species : Chiromeyia sp. [J. F. Aldrich] 

 and Agromyza parvicornis Loew. [J. F. Aldrich]. All 

 this prey is an addition to the list already published in 

 Wasp Studies Afield. Another cocoon of this wasp, 



