72 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



branches and live in colonies. They have fine black and white 

 longitudinal stripes on the body and near the cephalic end some 

 short black projections with a prominent reddish hump on the 

 fourth abdominal segment. They usually pupate under dead 

 leaves and sticks at the base of the tree and begin to pupate the 

 last of August or in the early part of September. They spin 

 a very thin cocoon which is usually fastened between two dead 

 leaves or some small sticks. There is only one brood in Maine 

 and adults emerge from these pupae the following spring. 



Genus HETEROCAMPA Doubleday. 



Body slightly wider at the cephalic half, tapering gradually 

 from the fourth abdominal segment to the cremaster ; fronto- 

 clypeal suture faintly indicated ; labrum somewhat triangular 

 in outline, much narrower on the caudal margin ; glazed eye- 

 piece about one-half the greatest width of the sculptured eye- 

 piece ; antennae more than seven-eighths the length of the wings ; 

 maxillae usually as long as the wings, but sometimes a little 

 shorter, the proximo-lateral angles extending laterad to the eye- 

 pieces ; prothoracic and mesothoracic legs visible and of the us- 

 ual length; labial palpi never visible; wings adjacent on the 

 meson below the maxillae but seldom touching; mesal length of 

 prothorax about 'two-fifths that of the mesothorax ; mesonotum 

 with a row of deep pits along the caudal margin separated 

 by smooth quadrangular areas ; mesal length of metathorax 

 one-fifth that of the mesothorax ; abdominal segments punctate ; 

 cremaster bifurcate, each half somewhat boot-shaped. 



HETEROCAMPA GUTTIVITTA Walker. 

 The Saddled Prominent. Fig. 6, C and D. 



Color very dark brown, often almost black ; surface smooth 

 and polished ; head, thorax and appendages slightly roughened 

 with fine, rather close striations excepting the genae and glazed 

 eye-pieces which are highly polished; maxillae slightly longer 

 than the antennae but never quite reaching the caudal margin 

 of the wings; pits along the caudal margin of the mesonotum 

 normally eight, but occasionally with only seven; mesothoracic 

 spiracle with a smooth, slightly elevated area adjacent to its 



