Saperda tridentata Classification Family Cerambycidae > Subfamily Lamiinae > Tribe Saperdini > Genus Saperda Diagnostic Features of Larvae Larva. Integument smooth, shining; more hairy than Saperda lateralis, the median disc of dorsal ampullae little wider than long, and asperities more sparsely placed; otherwise similar. Pupa. Form as in adult; remarkable for very long, stiff setae on head; points small and irregularly disposed on thoracic terga, but setae coarse: abdomen as in Saperda discoidea, but points shorter and setae coarser; a group of hairs on apical angle of femora. Adapted from Craighead (1923). Biology and Economic Importance The larva feeds between the bark and wood of dead, dying, and living Ulmus, often causing serious injury and death. The work resembles that of S. discoidea and S. lateralis. Trees which have just been felled are preferably attacked. Pupation takes place either in the sapwood or bark. Range, throughout the eastern and central United States and Canada. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923