PUPAE OF SOME MAINE SPECIES OF NOTODONTOIDEA 53 



of the tentorium, but not deep nor . very distinct ; eye-pieces 

 difficult to distinguish; elevation caudad of the mesothoracic 

 spiracle not prominent and not visible in ventral view, its sur- 

 face sparsely covered with whitish setae and not very noticeable, 

 a small furrow just caudad of the elevation; spiracular furrows 

 of the fifth abdominal segment distinct, narrow, five or six in 

 number and punctate at the bottom of the furrows ; cremaster 

 1.3 mm. in length, with a distinct transverse furrow at base, 

 rugose on the proximal half, the furrows deeper on the ventral 

 surface, and bifurcate for one-fifth its length. 



Length 10 to 12 mm. ; greatest width 3.5 mm. 

 The larvae of this species were collected on gray birch and 

 yellow birch. They were about an inch long, colored dull red, 

 marked with black in an irregular marbled pattern with a whitish 

 spot in front of each spiracle. They were collected the last 

 week of June and were ready to pupate in about two weeks. 

 In the laboratory they pupated on top of the soil without form- 

 ing a cocoon, but would probably burrow in the soil out of doors. 

 The adults emerged July 25. 



Genus HYDRIA Hiibner. 



Head short, slightly narrower than the thorax; body sur- 

 face slightly roughened with impressed lines and punctures, 

 but presenting a polished appearance; epicranial suture present 

 and distinct; labrum broader than long, rounded at the distal 

 end ; a small triangular portion of the labial palpi usually visible 

 caudad of the labrum ; maxillae sometimes reaching the caudal 

 margin of the wings, but usually slightly shorter and exposing 

 the tips of the metathoracic legs, the proximo-lateral angles 

 never extending as far as the eye-pieces ; antennae always reach- 

 ing the caudal margin of the wings ; prothoracic legs almost 

 three-fourths the length of the wings, their femora always ex- 

 posed ; mesothoracic legs usually slightly shorter than the an- 

 tennae ; both prothoracic and mesothoracic legs extending cepha- 

 lad between each sculptured eye-piece and the antenna; mesal 

 length of prothorax two-fifths that of the mesothorax; meta- 

 thorax about half the length of the prothorax and shorter than 

 the first abdominal segment ; mesothoracic spiracles slit-like ; 

 abdomen coarsely punctate, except on the ninth and tenth seg- 



