Web-spinning activity of Achaearanea tepidarorium (Koch) was observed in relation to amount of prior feeding, hours of food deprivation. and the number of flies (Drosophila melanogasters available in the animal's environment.Web spinning was positively related to the number of flies consumed in a 24-h period prior to testing, but did not vary significantly between 24 and 72 h of food deprivation. The amount of available food in the environment was positively related to web-spinning activity during a 48-h test period.