83 



had made its own way into uninjured stems. This fine moth is seldom, 

 seen on the wing, but is easily obtained by gathering the stems in- 

 fested by Saperda in May and keeping them moist for a few weeks. 



^(jeria corni Hy. Edw. — The trunks of the maples at Columbus are 

 greatly disfigured by the larva of ^geria acerni. The branches also 

 suffer to a large extent by the action of another ^geriid 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 diam- 

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

 rough barked and gnarled excrescences; these are often nearly glob- 

 ular; more often, however, oblong, and frequently there are openings 

 into the center 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 them down. There may 

 be one or more larvae in a single excrescence. 



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

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

 a strong longitudinal substigmatal fold. The head is smooth, pale 

 brown, with the anterior edge of the clypeus, labium, and mandibles 

 black; the thoracic shield smooth, broad, and colorless; feet pale yel- 

 low; stigmata small, round, pale yellow ; piliferous spots scarcely per- 

 ceptible; 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 outer shell remaining to be broken up by the pupa at the final 

 change, the pupa skin remaining protruded. 



The pupa measures 10™™, slender, light brown, with the usual trans- 

 verse denticles on the dorsal abdominal segments and a circle of stouter 

 teeth about the abdominal tip; the clypeus is armed with spine or tooth. 



The moths issued this year from May 11 to July 15. It is a pretty 

 species, the sexes differing somewhat in appearance, the female being 

 easily mistaken for that of acerni, although smaller. 



The male expands 17™™; the color deep black with some metallic 

 scales; the narrow clothed margins of the wings and heavy discal bar 

 deeper than the apical patch which is more bronze brown; fringes con- 

 colorous except the anterior third of inner margin, which is yellow. 

 Clypeus with white lateral lines; palpi light orange, except the black- 

 ish third joint and outer side of second apically; collar same color as 

 palpi; antennae black, slightly washed with white on outer edge of 

 apical third. The thorax yellow below, black above, with long golden 

 cilia about the insertion of the wings. Abdomen black above, same 

 below, with more or less of golden scales running up on the sides at 

 edges of rings, and on fourth ring giving a narrow band, in some seen. 



