MONOGRAPH OF THE GENUS SAPERDA 53 



experience, enter either the bark or the wood and transform to 

 beetles. The work of this species is shown on plate 3, figure 2. 

 Dr Hamilton has found more than 20 larvae, pupae and imma- 

 ture beetles, in the bark of a large hickory that had been killed 

 about two years before. All were on the north side of the tree 

 and none over 15 inches from the ground. In our experience 

 they are equally abundant on all sides of the tree but appear to 

 avoid any part infested by a dense white fungus growing between 

 the bark and wood and often into the wood, and as very often only 

 one side of the tree is so afifected, this may account for the experi- 

 ence of Dr Hamilton. Dr Horn states that the larvae fed on the 

 outer layers of the wood till they had attained nearly full growth 

 and then retired into the bark, closing their burrows and transform- 

 ing like a species of Urographis in oak. 



Food plants. This insect appears to confine its attack to dis- 

 eased or dying trees. We have reared it from trees killed by 

 Scolytus quadrispinosus Say. It has been recorded 

 on the hickory by Mr Harrington and as common on hickory 

 and walnut in southwestern Pennsylvania by Dr Hamilton. 



Description [pi. 3, fig. 5, 6]. Color above varies from black 

 to light reddish brown in some examples; thorax and elytra 

 strongly punctate; legs reddish brown, darker toward the tarsi. 

 The under side is white in the males and light yellowish gray to 

 light gray in the females. 



Female. Head and thorax covered with olive yellow hair; 

 scutellum yellow; the elytra denuded, except a small spot above 

 and one below; a crescent-shaped fascia in the middle of each 

 elytron, composed of dense yellow hair, which also forms a 

 marginal band spreading over the apical end of the elytra. 



Male. Uniformly ferruginous, black above, covered by a sparse 

 gray pubescence that forms a whitish line on the sides and dorsum 

 of the thorax, which is bordered by a denuded area. 



Distribution. Middle states [LeConte] ; Buffalo N. Y. [Zesch- 

 Reinecke] ; never plentiful about Hamilton Ont., though the fe- 

 males are usually the more numerous [Moffat] ; very rare at 

 Ottawa Can. [Harrington]; locally not rare throughout New 

 Jersey [Smith] ; and from Canada, New York, Pennsylvania, 



