60 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



long hooked setae ; mesothorax never with a deeply 

 pitted caudal margin. Symmerista. 



cc. Body usually punctate on the abdomen but not on the 

 appendages ; movable abdominal segments some- 

 times with a slight ridge along the cephalic mar- 

 gin but never with a row of large punctures just 

 caudad of it ; cremaster bifurcate, but never with 

 hooked setae; mesothorax with a row of deep pits 

 along the caudal margin, with smooth quadrangu- 

 lar areas between and partly covering them. 

 d. Wings always touching on the meson; max- 

 illae never as long as the wings ; cephalic 

 end of body sometimes with two sharp, 

 heavily chitinized projections. 



Schizura. 



dd. Wings adjacent on the meson but not touch- 

 ing; maxillae usually as long as the wings; 

 cephalic end of body never with heavily 

 chitinized projections. Heterocampa. 



Genus MELALOPHA Hiibner. 



Body cylindrical, blunt at the cephalic end, the head scarce- 

 ly visible in dorsal view; surface smooth, polished, covered 

 with very fine setae which are only visible by the aid of a lens ; 

 epicranial suture present but only a small portion visible, the 

 vertex being represented by a small triangular area adjacent to 

 each antenna ; labrum usually broader than long ; sculptured 

 eye-piece more than twice the width of the glazed eye-piece ; 

 antennae broader at the proximal end than the prothoracic legs 

 and tapering gradually to a pointed tip ; labial palpi usually en- 

 tirely concealed, but occasional specimens show a small portion 

 just caudad of the labrum ; maxillae one-third or less the length 

 of the wings, the proximo-lateral angles never reaching the eye- 

 pieces ; legs of the normal length, both prothoracic and meso- 

 thoracic legs adjacent on the meson caudad of the maxillae, and 

 a very small portion of the metathoracic legs showing between 

 the wings at their caudal margin; thorax relatively short, only 

 about one-fourth the length of the body; mesal length of pro- 

 thorax two-fifths that of the mesothorax; metathorax shorter 

 than the first abdominal segment ; spiracles all slightly elevated, 



