210 THE CANADIAN ENTOMOLOGIST. 



by the larva of S. concolor. The beetles appeared from the middle of 

 May to the middle of June ; the female gnaws deeply through the bark 

 into the wood, generally near a branch, and places an egg at the bottom 

 of each pit ; the larva is soon burrowing under the bark and into the 

 wood ; there are often several at the same point. The Aegerians appear 

 later in June and July and place their eggs in the excrescenses caused by 

 the boring young of the beetle. I have not yet found instances in which 

 it was clearly apparent that the young Sciapteron had made its own way 

 into uninjured stems. This fine moth is seldom seen on the wing, but is 

 easily obtained by gathering the stemi infested by Saperda in May and 

 keeping them moist for a few weeks. 



Aegeria corni, Hy. Edw. — The trunks of the maples at Columbus are 

 greatly disfigured by the larvie of Aegeria acerni. The branches also 

 suffer to a large extent by the action of another aegerid infesting them. 

 The former pest is confined almost wholly to the trunks of shade trees ; 

 the latter occurs in both shade and forest trees — most numerously in 

 the latter or perhaps in isolated trees in the fields. 



The branches ranging from mere twigs to those an inch or two in 

 diameter are found much enlarged, often at several different points, into 

 rough barked and gnarled excrescences ; these are often nearly globular, 

 more often, however, oblong, and frequently there are openings into the 

 centre of the stem. On cutting into the wood it is found to be mined in 

 various directions and decaying ; this often causes the branch to die or 

 so weakens it that the winds throw it down. There may be one or 

 more larvi>i in a single excrescence. 



The mature larvae are 12 to 15 mm. long; body slender, white; the 

 skin is transversely folded, especially in the thoracic rings, and there is a 

 strong longitudinal subsligmatal fold. The head is smooth, pale brown, 

 with the anterior edge of the clypeus, labium and mandibles black; the 

 thoracic shield smooth, broad and colourless ; feet pale yellow ; stigmata 

 small, round, pale yellow ; piliferous spots scarcely perceptible ; fine, 

 short hairs chestnut. 



The larva changes to pupa in a thick, gummy cocoon, strengthened 

 exteriorly by bits of wood and placed in cells just under the bark, with a 

 thin shell remaining to be broken up by the pupa at the final change, the 

 pupa skin remaining protruded. 



The pupa measures 10 mm , slender, light brown, with the usual 

 transverse denticles on the dorsal abdominal segments and a circle o^ 



