78 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



lar, then a narrow, cylindrical portion which expands into a 

 wider, knob-like end with a row of inconspicuous projections on 

 the dorsal surface. 



A pupa of this species was collected from white birch, Aug- 

 ust 3. The cremaster was entangled in a web of silk on the 

 underside of a leaf, but there was no cocoon present. The adult 

 emerged August 15. 



The larvae of these are dark red above and have a pair 

 of prominent tubercles on the first abdominal segment. 



LIST OF ABBREVIATIONS. 



a. antennae 



al-alO. abdominal segments 1-10. 



ao. anal opening. 



at. invaginations for the anterior arms of the tentorium. 



cl. clypeus. 



cm. cephalic margin of an abdominal segment. 



cr. cremaster. 



es. epicranial suture. 



f. front. 



f 1. femur of the prothoracic leg. 



ge. glazed eye-piece. 



go. genital opening. 



Ib. labrum. 



li prothoracic leg. 



22 mesothoracic leg. 



3a metathoracic leg. 



lp. labial palpi. 



ms. mesothorax. 



msp. mesothoracic spiracle. 



mt. metathorax. 



mx. maxillae. 



p. prothorax. 



s. spiracle. 



se. sculptured eye-piece. 



sf. spiracular furrow. 



ts. tubercle scar. 



v. vertex. 



w 1. mesothoracic wing. 



w 2. metathoracic wing. 



Fig. 2, A to I. 



A Hypothetical pupa, ventral view. 



B Hypothetical pupa, dorsal view. 



C Cosymbia lumenaria, ventral view, female. 



