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Since the ant fauna of Nevada is virtually unknown the two new species described herein are of more than ordinary interest. Both were sent me by Dr. Ira La Rivers of the University of Nevada who collected them in the general region of Pyramid Lake, Washoe County, Nevada. One is a very distinct form of honey ant (Myrmecocystus) which I have named pyr amicus because of the pyramidlike structure of the epinotum. The other is a harvesting ant (Veromessor) which, though related to pergandei (Mayr), is definitely different. This new form has been named lariversi in honor of its collector. Illustrations of Myrmecocystus pyramicus are included.

In a greenhouse, each nest of Pseudomasaris edwardsii (Cresson) was constructed of nectar-moistened soil, was solitary and was placed in open but concealed niches attached to a variety of substrates. The wasp anchored her egg by its posterior tip to the bottom of the cell, deposited a jellylike cylindrical provision composed of Phacelia pollen and nectar and constructed a cell cap. Soil carried to the nest was attached to the post genal surfaces of the female's head, and the pollen and nectar were transported in her honey stomach. Cells were clustered and attached to each other and to the substrate along their lateral margins. Most nests were covered with separate layers of soil (surface ornamented in various ways) that camouflaged the nest against natural enemies and protected it against extreme temperatures. The larva, after consuming its provision, spun a cocoon which closely adhered to the inner surface of the cell, and then voided its feces across the bottom of the cell. The post-defecated larva subsequently migrated to the anterior limit of the cell where it firmly appressed against the cocoon as it assumed a strongly decurved, overwintering, prepupal position. Rearings in the laboratory indicated that the species is univoltine and nonproterandrous. The immature forms of P. edwardsii and Euparagia scutellaris Cresson are described and represent the first descriptions of the immatures within the family Masaridae. Relationship of these immatures is discussed and both are compared with the immature forms of other known vespoids.