Laboratory studies of effects of temperature and adult density (10 females or 50 females per 250 cm2phloem ofUlmus AmericanaL.) on maternal gallery construction and oviposition byScolytus multistriatus(Marsham) indicated that response of adult beetles at 25 and 30°C was similar. At the higher density, maternal galleries were shorter (20 mm) and there were fewer egg niches per unit length of gallery (1.8/mm); at the lower density, maternal galleries averaged 23 mm and there were 2.5 egg niches per mm of gallery. Length of the egg-free portion of the maternal gallery was similar at both densities.