THE CANADIAN ENTOMOLOGIST. 307 



NOTES ON THE LlKE-HISrORY OK CEKURA 



OCCIDENTALIS. 



BY HARRISON G. DYAR. 



These notes are to complete the partial account of the life-history 

 given in Dr. Packard's monograph. 



Egg. — As usual, hemispherical with a flat base, dark black-brown, 

 not shining; diameter i.i mm., height .7 mm. Reticulations neat, 

 distinct, rounded hexagonal, smooth, not elevated, the enclosed spaces 

 densely coarsely granular, serving to make the smooth reticulations con- 

 spicuous. Laid singly on a willow leaf. 



Sfage I. — Head bilobed, rather square ; red-brown, the ocelli darker; 

 width .5 mm. Dorsum of joints 3 to 12 continuously broadly greenish- 

 yellow, the rest of the body purplish-brown ; tails darker, blackish toward 

 the base, with two sordid white rings. Cervical horns and tails spiny. 

 Setae normal, i. to v. and leg-[)late present on the abdomen, i. a and b, 

 ii. a and b, iv. and vi. on thorax, vi. double, ii. b not very evident. At the 

 end of the stage the yellow band is slightly constricted at joints 6-7 and 

 ir, horns, cervical shield, anal plate and tails darker than the now vinous 

 body. Head light red ; abdominal feet whitish, thoracic blackish ; no 

 marks. 



Dr. Packard's descriptions of stages II. and III. are comparative 

 only, so I give my notes in full. 



Stage II. — Width of head .9 mm. Medial suture deep ; all red- 

 brown, uniform, smooth, the clypeal tubercles marked by yellowish dots. 

 Dorsum to spiracles vinous brown except a yellow patch on joints 3-5 

 and 7 post -10 ant., the now dark parts of the former yellow band smoky 

 olivaceous ; subventral region and legs pale yellowish ; two yellow rings 

 on the tails. Tubercles distinct, setae dark. Cervical horns slightly 

 spinose ; length of tails 2.8 mm. During the stage the larva suffers an 

 entire change in markings, resulting as follows : Green, an incised dorsal 

 brown band triangular from the horns to a slight fold on the anterior 

 pirt of joint 3, elliptical on joints 4 to 11, widening to the anal pi-ate, with 

 a very slight retraction at the incisure of joints 11-12. A yellow patch 

 on joints 7 post.- 10 ant. 



Stage III. — Width of head r.5 mm. At first much the same as at 

 the end of stage ii. Later head reddish-brown with many pale yellow 

 dots over the lobes ; pale behind the brown ocelli. Body bluish-green, 

 dotted with white and yellow and shaded with white in the region of the 



