28 MASS. EXPERIMENT STATION BULLETIN 189. 



The Pupa. 



Average length of ^ , 13 to 14 millimeters; of 9 , 16 to 17 millimeters. 

 Average width of ^ , 2 to 2.5 millimeters; of 9 , 3.5 to 4 millimeters. 



Color varies from light. to dark brown, venter comparatively smooth, 

 dorsum darker in color with fine transverse wrinkles. Form elongate 

 with peculiar "shouldered" appearance of the body, caused by the great 

 width of the thorax as compared with width of the head. Appendages 

 firmly cemented to the body. Wings, maxillse, antennae and mesothoracic 

 legs, together with metathoracic legs which lie beneath, are approximately 

 equal in length and extend to the middle of the fourth abdominal segment. 

 Prothoracic legs terminate midway between the head and the tip of the 

 other appendages. Dorsum of thorax very. dark, not shiny, with a distinct 

 smooth, slightly elevated ridge extending along the dorso-median line. 

 The fifth, sixth and seventh abdominal segments bear a ridge near the 

 anterior border, which extends completely around the segment. On the 

 dorsum of each of the fourth, fifth and sixth abdominal segments is a 

 transverse line of four bicuspidate projections of the body wall. A pair 

 of proleg scars are visible on the venter of the fifth and sixth abdominal 

 segments. The last segment of the pupa terminates in a dark brown, 

 or black, cremaster, which bears at its extremity eight small spines, ar- 

 ranged transversely, which curve forward at their tips and serve to attach 

 the pupa to its cocoon. Length of these cur\'ed spines about .19 milli- 

 meter. Spiracles ellipsoidal, prominent and borne on abdominal seg- 

 ments 2 to 7, inclusive. The pupa is alwaj^s enveloped in a thm cocoon. 



The terminal segments of S and 9 pupae differ in shape and in arrange- 

 ment of plates. 



The Adult. 



Alar expanse: male, 24-26 millimeters; female, 29-32 millimeters. 

 Length of body, 13-14 millimeters in both sexes. 



Head above covered with light yeljowish brown scales, except adjacent 

 to compound eyes, where scales are white; ventral surface, white. Labial 

 palpi porrect; second segment covered with dense projectmg, cinnamon- 

 brown to light brown scales attenuated to a point forward; terminal 

 segment concealed; basal segment covered with white scales. An im- 

 aginary line, passing through the axis of the body tangent to the lower 

 edge of the compound eye, will divide the labial palpi into two portions 

 according to their coloration, the upper portion being cinnamon-brown, 

 the lower portion white. Maxillary palpi light brownish, erect, slightly 

 dilated and converging at apex. Tip of labial palpi and maxillary palpi 

 the same color in female, labial palpi somewhat darker in male. Pro- 

 boscis long, with cream-colored scales, usually tightly coiled and almost 

 completely hidden by labial palpi when viewed from the side. Antennae 

 filiform, two-thirds the length of the front wmg, with a longitudinal 

 stripe of cream-colored scales on the posterior side; opposite side brownish. 



