510 REPORT OF NEW JERSEY STATE MUSEUM. 



Family PSYCHIDJE. 



These are the "bag worms," so called because the larvse make a case 

 or sac, closed at one end, of leaves, chips or silk, in which they live and 

 which they carry about with them. The male moths only are winged, the 

 wings transparent or thinly scaled, black, the body very hairy, abdomen 

 long and slender, antennae pectinated. The females are grub-like and 

 lay their eggs in the sac which they constructed as larvae. 



THYRIDOPTERYX Steph. 



*-~. 



JO 



Fig. 213. Bag worm, Thyridopteryx cphemertxformis : a, larva; b, 



male pupa; c, adult female; d, adult male; e, bag cut open 



to show the egg mass; f, bag carried by feeding 



caterpillar; g, young larvae in their first case. 



T. ephemeraeformis Steph. The common "bag" or "drop-worm." Occurs 

 throughout the State on a large variety of fruit, shade and ornamental 

 trees, deciduous and coniferous. It is especially injurious to "Arbor 

 vitas" hedges, which are often entirely killed by it. The bags con- 

 taining eggs hang on the trees all winter, the larvae hatch in May, 

 and adults appear in late August and September. Among remedial 

 measures, picking off and destroying bags in winter takes first rank. 

 During the growing season the larvae succumb readily to arsenites, but 

 on "Arbor vitse" and conifers only arsenate of lead can be safely used. 



EURYCYTTARUS Hamps. (PYSCHE Ochs.) 



E. confederata G. & R. Paterson V, 25 (Gr) ; Ft. Lee V, 29 (div); Jersey 

 City (Sb); Newark (Soc); Elizabeth VI, 15, VIII, 10 (Bz) ; DaCosta 

 VI, 3 (Dke). It probably occurs throughout the State and is locally 

 common, though not often found. The larvae occur on the bark of oak, 

 chestnut, dogwood, hemlock and pine early in the season, and Mr. 

 Beutenmuller says it is two-brooded. 



