88 REPORT OF THE STATE ENTOMOLOGIST I92I 



diameter in the bark and outer sap wood, mostly the latter. It was 

 reared again in 191 5 from a small hickory log cut in February, the 

 insects appearing in March and continuing to issue until toward 

 midsummer. This species has been recorded as infesting logs and 

 dead trees of black oak, white oak, hickory, chestnut, ash and elm, 

 though in our experience it freely invades trees in a weakly 

 condition. 



Neoclytus erythrocephalus Fabr. This is a sm.all, reddish 

 beetle about three-eighths of an inch long and prettily marked with 

 three yellow nearly transverse lines on each wing cover. It breeds 

 rather commonly in sickly and dying elm and hickory and appar- 

 ently in a variety of other trees, particularly locust, tulip, cornus, 

 red bud and grape. 



It was reared in late March 191 5, from a hickory log cut in Feb- 

 ruary, the insects continuing to emerge in considerable numbers 

 during the summer and one living specirnen was found in January 

 1916. The data appear to indicate an annual generation for this 

 species with some tendency toward an extension to the next season 

 under unfavorable conditions. 



Common flat-headed borer (Chrysobothris femorata 

 Fabr.). The adult is a somewhat inconspicuous, metallic, grayish, 

 flattened beetle one-half to five-eighths of an inch long. It occurs 

 on various trees. The legless, fiat-headed grub makes shallow gal- 

 leries in the wood. The beetles appear from the end to the middle 

 of February and may often be seen resting on the trunks of trees 

 or flying around them during the day time. The eggs are prob- 

 ably deposited in bark crevices and the young grubs feed on the 

 sap wood and inner bark, the galleries increasing in size and sink- 

 ing deeper in the wood as the borer develops. This insect is 

 recorded as attacking a considerable variety of both native and cul- 

 tivated trees. 



Adults were reared April 9 and 10, 191 5, from a hickory log 

 cut the preceding February, and an examination in February 1916, 

 resulted in finding no signs of flat-headed borers, evidence in favor 

 of an annual life cycle for this species. 



Quercitron bark beetle (Graphisurus fasciatus 

 DeG.). This is an elongate, rather slender, grayish, black-spotted 

 beetle with a length from one-third to a little over one-half of an 

 inch. It is recorded as a borer of beech and hickory and was reared 

 the latter part of March 191 5, from a log cut the preceding Feb- 

 ruary. It is apparently limited to weakened or dying trees. The 



