1974] 
Alcock & Gamboa — Cerceris 
533 
also possess home ranges. Additional comparative data based on 
studies of marked populations of males are required to test this pre- 
diction. 
Acknowledgments 
We thank Dr. Howard E. Evans for his review of a draft of this 
paper. This study was supported by National Science Foundation 
Grant GB-42865. 
References 
Alcock, J. 
1974. The nesting behaviour of Cerceris simplex macrosticta (Hymen- 
optera: Sphecidae). J. Nat. Hist., 8: 645-652. 
1975. Territorial behaviour by males of Philanthus multimaculatus 
(Hymenoptera : Sphecidae) with a review of territoriality in 
male sphecids. Anim. Behav., in press. 
Peckham, D. J.. F. E. Kurczewski & D. B. Peckham 
1973. Nesting behavior of Nearctic species of Oxybelus (Hymenoptera: 
Sphecidae). Ann. Ent. Soc. Amer., 66: 647-661. 
Scullen, H. A. 
1965. Review of the genus Cerceris in America north of Mexico 
(Hymenoptera: Sphecidae). Proc. U. S. Nat. Mus., 1 16: 333-548. 
