A first account of the habits of Pseudomasaris vespoides has been given by Dr. A. Davidson ('13). He found their nests, usually attached to a twig of a low bush, and built after the manner of the mud dauber wasp but of stony hardness. The completed cell was closed by a stopper of clay which was depressed in the center so that the top of the nest presented a series of small cups. The cup was believed to conserve the rain, soften the stopper and enable the insect to more easily emerge. The cells were thought to have been stored with small larvae. According to Bradley ('22), P. vespoides is found in South Dakota, Idaho, Colorado, New Mexico, Utah, Nevada and California.

The types of the new species herein described will be found in the Canadian National Collection. Many of them have been collected by workers in Western Canada through whose efforts very many species not previously represented on the National Collection have been secured and to whom we are greatly indebted.

That four species of Papaipema, Papaipema stenoscelis Dyar, P. speciosima G. & R., P. inquaesita G. & R. and P. pterisii Bird, persist in making a food choice among the Cryptogams, those plants whose ancestry dates so far back in the floral phylum, might suggest that this quartet should show evidence of being the fore-runners of their generic complex.

While collecting in the vicinity of Niagara Falls, Ont., last summer, a new species of Empis was secured and a description is offered below. The species was quite common there during the latter part of June and specimens were found frequenting shady nooks in the rich moist woods of Niagara Glen.