Psyche 
[Vol. 93 
340 
Heinrich, B. 
1984. Strategies of thermoregulation and foraging in two vespid wasps, Doli- 
chovespula maculata and Vespula vulgaris. J. Comp. Physiol. B 154: 
175-180. 
Kemper, V. H., and E. Dohring 
1962. Untersuchungen liber die Ernahrung sozialer Faltenwespen Deutsch- 
lands, inbesondere von P. germanica und P. vulgaris. Z. Ang. Zoologie 
49(2): 227-280. 
Kleinhout, J. 
1958. Het verzmelen van prooien van sociale wespen. De Levende Natuur 61 : 
179-182. 
MacDonald, J. F., R. D. Akre, and W. B. Hill 
1974. Comparative biology and behavior of Vespula atropilosa and V. pensyl- 
vanica (Hymenoptera: Vespidae). Melanderia 18 : 1-65. 
MacDonald, J. F., R. D. Akre, and R. W. Matthews. 
1976. Evaluation of yellowjacket abatement in the United States. Bull. 
Entomol. Soc. Amer. 22(4): 397-401. 
Spradbery, J. P. 
1973. Wasps. University of Washington Press, Seattle, xvi + 408 pp. 
