Id Maine Agricultural Experiment Station. 1917. 



clypeal region elevated to form a prominent quadrangular tu- 

 bercle bearing two prominent setae ; tubercle at the proximal 

 end of each antenna also bearing prominent setae ; antennae 

 tuberculate, the three rows of tubercles arranged transversely ; 

 surface of thorax more roughened than that of the head and 

 with a small, irregular tubercle at the base of each important 

 seta ; dorsal furrow between the ninth and tenth abdominal seg- 

 ments distinct, the caudal margin not more strongly chitinized 

 and toothed as in the Geometridae ; tenth segment (Fig. 6, F) 

 with a distinct V-shaped depression at the proximal end of the 

 cremaster, the triangular area between considerably more el- 

 evated than the remainder of the segment ; cremaster triangular 

 in outline, rugose, the lateral margins convex, and narrowed to 

 a rounded tip, then flaring suddenly on each side to form a 

 spiny process which is much shorter than the stout curved setae ; 

 four stout hooked setae inserted at the meson at the caudal end 

 of the cremaster and one inserted on each side on the ventral sur- 

 face just caudad of the lateral projections of the cremaster. 



Length about 12 mm. ; greatest width 4 mm. 



The larvae of this species were collected on the leaves of 

 gray birch June 26. They are peculiar in that they have no 

 well developed anal prolegs. The last segment bears a cylindri- 

 cal projection which sticks up and away from the surface of the 

 leaf. The body is roughened and somewhat granular with some 

 wart- like projections on the mesothorax and metathorax and 

 the second abdominal segment. The colors are yellowish or 

 golden brown, with darker brown markings. They spin a thin 

 yellowish cocoon which is usually fastened to the under side of 

 the leaf. Often the leaf is curled over the cocoon so as to con- 

 ceal it. The pupae are at first a bright yellow brown, but after 

 a day turn dark brown and the bloom appears. The adults 

 emerged July 23. 



Genus DREPANA Schraiik. 



Body of usual shape with two prominent cephalic projec- 

 tions ; face-parts not prominently elevated, the labrum being 

 slightly more convex than the remainder ; eye-pieces reached 

 only by the prothoracic leg which extends for a 'short distance 

 between the sculptured eye-piece and the antenna; antennae 

 about four-fifths the length of the wings, widest at the proximal 



