. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 456 Bulletin Museum of Comparative Zoology, Vol. 140, No. 7 \ A^v_ \A. V ⢠Bembix a. spinolae ^Steniolia obliqua â Hoplisoides sp i lographus if A mmoph i la azteca O Oxybelus u. quadrinotatus A N itelopterus eva n si Q S tenodyner us papagorum tV Xy locel ia a rgent inae o \ ⢠s __ o Q PARKING LOT * OLD DIRT ROAD o ⢠⡠D TREE â ___ A * ______ D |*D* o o â â TRAIL . o 10 meters o D. O O o ⢠o VTmTTTTTTTTTTrT^TTTTZ^TTTTTTZWT^TTTm. ^^^^ ^/'/>>>/^/y//W///^^^^^. SNAKE RIVER Map 2. Detailed map of study area
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 456 Bulletin Museum of Comparative Zoology, Vol. 140, No. 7 \ A^v_ \A. V ⢠Bembix a. spinolae ^Steniolia obliqua â Hoplisoides sp i lographus if A mmoph i la azteca O Oxybelus u. quadrinotatus A N itelopterus eva n si Q S tenodyner us papagorum tV Xy locel ia a rgent inae o \ ⢠s __ o Q PARKING LOT * OLD DIRT ROAD o ⢠⡠D TREE â ___ A * ______ D |*D* o o â â TRAIL . o 10 meters o D. O O o ⢠o VTmTTTTTTTTTTrT^TTTTZ^TTTTTTZWT^TTTm. ^^^^ ^/'/>>>/^/y//W///^^^^^. SNAKE RIVER Map 2. Detailed map of study area MOR-A2, showing location of marked nests of 8 species over a period of several days in late July, 1964. There were many more, unmarked nests of each of these species as well as nests of numerous other species. tendency for segregation of species in ac- cordance with minor differences in con- sistency of the soil. Location of nests of some of the species occurring in MOR-A2 are shown in Map 2 (see also Fig. 1). In this community, certain wasps (notably Bembix and Oxybelus) tended to occupy the very friable sand near the river, certain others occupied more compact sand along trails and roads (especially Ammophila and Stenodynerus), while still others occu- pied places in partial shade or with more ground cover (Steniolia, Diodontus). In this site, the eight species listed on the map all nested in great numbers during late July and early August, along with many other species, some of them nearly or quite as abundant as those listed (, Episyron quinquenotatus, Nitelopte- rus evansi, Podalonia communis). Thus the scene in midsummer is one of constant activity involving many hundreds of ground-nesting wasps belonging to literally dozens of species. Moving to a neighboring site of quite different soil type (, to MOR-B3; Fig. 2), one finds a rather different set of wasps, in this case dominated by species of Philanthus, Pisonopsis, and Belomicrus, but with several
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