xxxiii, '221 ENTOMOLOGICAL NEWS 237 



tissue are of no special economic importance. Larvae of the 

 predaceous forms, although confined to either deciduous trees 

 or conifers in nature, will in captivity feed on any woodboring 

 larvae, and will attain at maturity their natural characteristics 

 and markings. 



Many species transform in July and August, and remain in 

 their pupal cells until April or May of the following year. Dur- 

 ing this time adults with the cast larval skins may be found 

 together, thus furnishing a means of connecting the adults with 

 the larvae. Adults also hibernate beneath bark, in crevices 

 and in abandoned cells of various insects, and are sometimes 

 attracted to light. 



While the family Elateridae has not been considered as con- 

 taining any particularly beneficial species, a more thorough 

 study of the younger immature larval stages will no doubt 

 reveal as many equally important predaceous species as those 

 of the family Clcridac. 



ELATERIDAE. 



ADELOCFRA IMPRESSICOLLIS Say. Harrisburg, Pennsylvania, VII-15; 

 Rockville, Pennsylvania, XII-12. Rare. Hibernating in decayed cavity 

 in living tree. 



A. RORUI.ENTA Lee. El Paso County, Colorado, VI-14, VII-12. A. B. 

 Champlain. 



A. BREVICORNIS Lee. State College, Pennsylvania, V-25 : Charter 

 Oak. Pennsylvania, V-21 ; J. N. Knull. Wales. Maine. VI-23; C. A. 

 Frost. Rare. 



A. OBTKCTA Say. Pennsylvania. VI, VII. Franklin, Xew Hampshire, 

 IX-18, larva and adult found in gallery of woodborer in apple twig. 

 F. C. Craighead. 



A. PROFUSA Cand. Cornwall, Connecticut, VII-15, K. F. Chamber- 

 lain; Cranebrook, British Columbia, VTI-8, C. B. Garrctt ; Oregon, VI fi- 

 ll, adults taken in Yellow Pine, W. D. Edmonston. 



A. MARMORATA Fab. Rockville, I1I-3; Hummelstown, IV-20, Kirk 

 and Knull : and Harrisburg, April, June, July ; all in Pennsylvania. 

 Larvae of this species found feeding on Rostrychid larvae ( Trichodcsma 

 t/ihlhtsa) in Gum tree (\yssa sykuticn). 



A. nisi OIIIKA Web. All localities in Pennsylvania. Common beneath 

 bark of dead Pine. 



V AVITA Say. Hummelstown, 1 1 1-2*7, VII-7, Kirk and Knull. and 

 State College, V, both Pennsylvania. A number "t" adults reared from 

 larvae collected beneath bark of dyin. uid dead hickory trees. These 

 trees were heavily infested with wuodboring larvae which were the 



