The nesting behavior of a small aggregation of the digger wasp Steniolia elegans near Fort Collins, Colorado, is described. The prey was found to consist primarily of bee flies (Bombyliidae), the egg being laid erect on the first fly placed in the cell. Nests were shallow, unicellular, and were closed at all times when the female was away.
Evans, Howard E.
"Notes on the nesting behavior of Steniolia elegans (Hymenoptera: Sphecidae),"
Great Basin Naturalist: Vol. 33
, Article 4.
Available at: http://scholarsarchive.byu.edu/gbn/vol33/iss1/4