On the knowledge of Ips amitinus (Eichh.) The authors compile some quantitative data on the “Smaller Spruce Bark Beetle”Ips amitinus, comparing it withIps typographus. In addition to well known values, differences were measured in diameter of entrance holes, distance between the egg niches, and size of the larvae's head capsules. Very small differences, between the two species, were found in offspring production depending upon gallery density, and in egg mortality.