Polymorphism in some nearctic halictine bees.

Average difference in size between queens and workers of four social Halictinae common to southern Ontario ranges from 6 percent in Augochlorella striata (Prov.) to 15 percent in Evylaeus cinctipes (Prov.). Spring larvae receive. provisions averaging 33.9 milligrams and become small workers; summer larvae consume on average 61.7 milligrams and develop into large queens and males.