228 BIOLOGICAL SURVEY OF 



Malacosoma Hiibner 



M. AMERiCAJSTA Fab. (3989). The American Tent Caterpillar. 

 Always present. In great numbers '35 and '36 and almost 

 none in '38. Show great variation. The larvae form large 

 tent-like webs on the apple, cherry, and other trees. The 

 caterpillars are heavily parasitized by Tachinid flies. 



M. DissTEiA Hbn. (3997). The Forest Tent Caterpillar. Gen- 

 erally distributed but in smaller numbers. Among other 

 plants the larva feeds on blueberry. 



M. DissTRiA form sylvatica Harr, (3997). Generally distrib- 

 uted in small numbers. The larvae feed on birch, cherry, 

 poplar, willow, etc. 



Epicnaptera Eambur 



E. AMERICANA Harr. (3999). The American Lappet. Bar 

 Harbor (Br.); Penikese at light, May 26-July 16. Has 

 various color forms which are supposed to be local races. 



Thyatiridae 



Habrosyne Hiibner 



H. scRiPTA Gosse (4004). Witch Hole Pond sugaring; Cor- 

 field at light. May 30-Aug. 6. Scarce. 



PSEUDOTHYATIRA Grote 



P. CYMATOPHOROIDES Gu. (4007). Bar Harbor, July 17- Aug 

 4 (Br.). The larva feeds on birch, maple and oak. 



P. CYMATOPHOROIDES foi'm EXPULTRix Grt. (4007). N. E. Har- 

 bor (Minot) ; Bar Harbor (Br.), July 2-19. The larva has 

 same food habits as above. 



Drepanidae 



Oreta Walker 



0. ROSEA Walk. (4019). N. E. Harbor (Minot); Corfield at 

 light, July 10-Sept. 5. The larva feeds on Viburnum. 



O. ROSEA form irrorata Pack. (4019). N. E. Harbor, July 10; 

 Bar Harbor (Burton). 



