72 NEW YORK STATE MUSEUM 



This species is probably not injurious as a rule, though the larvae 

 undoubtedly hasten decay by running their galleries in dead and dying 

 wood. It is often associated with the much more injurious elm borer, 



5 a ]) e r d a tridentata Oliv., and probably follows this species. It has 

 been bred by Dr Lintner, from elms infested by Saperda, 1 1 examples 

 emerging between April 29 and May 12, from a piece 3 inches long and 



6 inches in diameter, and more were obtained from other sections on June 23, 

 and thereafter to July i. He has also reared it from hickory, locust and 

 pear twigs infested with Xyleborus dispar Fabr. Dr LeConte has 

 reared it from hickory logs infested by S i n o x y 1 o n b a s i 1 a r e Say., and 

 states that its borings are much coarser than the last named species, and 

 that it exhibits a decided preference for the softer portions of the wood. 

 The exit gallery of the adult may be distinguished from that of Sinoxylon, 

 according to him, by its gradually approaching the surface instead of at 

 right angles as in the case of the latter. Mr Chittenden regards this insect 

 as having no favorite food plant, since he has obtained numerous specimens 

 in about equal abundance, from trunk and branch of C o r n u s f 1 o r i d u s, 

 tulip (L i r i o d e n d r o n tulipifera), locust (Rol)inia pseud aca- 

 cia), Cercis canadensis, hickory and grapevine. He has observed 

 the adults common on appletrees, usually pairing and in such abundance 

 that there was little doubt but what they bred in the trees. The beetles 

 occur in Washington from the last of April till toward the end of July. 

 Individuals were reared by him from locust twigs kept indoors two years. 

 He states that the larval galleries are very extensive in dogwood, the young 

 evidently ])assing a considerable portion of its time under the hark, after- 

 ward penetrating the solid wood, which is still more extensively bored. 

 The pupal cell is often in the center of a large twig, and the exit is exca- 

 vated before the final transformations occur. 



We have bred this insect several times from elm limbs infested by the 

 elm snout beetles, M a g d a 1 i s a r m i c o 1 1 i s Say., and M. b a r b i t a Say., 

 and Mr Hubbard has had a similar experience. Dr Riley records finding a 

 a trravid female near the root of a rosebush at Washini^ton, and Mr Adams 



