20 Trans. Acad of St. Louis 



drop l)ack into tlioir liolcs most tantalizinirly upon our 

 approacli. Tlit'so holes provcil to bo tlio old burrows of 

 beetles, ti<i:litly ])acked with sawdust. The wasps wore 

 evidently ('nlarii:in,i^ their (piarters l)y rciuoxini,^ tliis 

 ]Vdckiuix. 



H fipocrahro tcranus Cress. [S. A. TJohwer]. Tliis wasp 

 was found in a hollow stem, toirother with some larvae 

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

 was really the bee's home, and the wasj) liad merely 

 soup^bt shelter here for the ni2:ht. 



Jlypocrahro stirpicolus Pack. [S. A. Roliwer], The 



live wasp was found in a tunnel in au ailanthus twi^ 

 taken in the ^fissouri 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 

 caterj)illars, while this species rears its young on flies. 

 Another stem with soft pith, taken at Wicks, ^fo., 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 <'merged 

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

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

 nest was found in a cottonwood sprout, which liad been 

 chopped off exposing the pith. The tunnel was newly 

 completed, nine inches long and tiiree-sixteenths inch 

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

 rupted the worker. The mother was caught in the bunow 

 with three flies, all dead: Oxi/ccra waculata <Ui\-. | ('. T. 

 Gvoone], Phorbia fusciprs Zett. [C.T.Greene] and RivcUia 

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

 flies of two other species: Chiromcifia sp. [J. F. Aldricli] 

 and Afiromyza parvicornis Locw. [J. F. Aldrich]. All 

 this prey is an addition to the list already published in 

 Wasp Studies Alield. Anoth(>r cocoon of this wasp, 



