857 



S('<iiii. 9 := 2, bilt s. infrastigmalis fails. 



„ 10. /S'. (/orsa/is^ s. .subdorKdIis and ö'. siqyrastigmalis on tlic 

 anal flap, under it s. j)rosfi(pnalis ; s. infrastigmalis is ab- 

 sent, one s. pedalis. 



„ 11. Behind the anal flap is one tuberculum belonging to 

 the dorsal part of segment 11. 



Instar //. The pattern described above is totally absent here. The 

 skin is covered with the tubercula described for Sphinx ligustri. 



Recapitulation. Tlie setal pattern of instar I quite agrees 

 with that of Sphinx ligustri^ only the s. dorsolaterales or tjie 

 .s. suprastigmales on the thoracic segments are wanting. 



Tlie caudal horn jnst as in Sphinx ligustri originates by a 

 median protuberance of abd. segm. 8 under the left and right 

 8. (lorsales. 



Between these primary tubercula we find small umbrella-shaped 

 setae. 



In instar II this whole pattern has disappeared just as the par- 

 ticular setae which have been replaced by small ones of the 

 ordinary form. 



Smerinthus populi Linn. 



Material on alcohol. Jiily 1914. Plate XIII, fig. 8 a, b. 



Instar I. Length 4 mm. 



The whole surface is covered with the small umbrella-shaped 

 setae, which I described for Smerinthus tiliae. The primary 

 tubercula and setae are wanting except: 



Prothorax. S. infrastigmalis, one s. basalis. 



Mesothorax and nietathorax. One s. basalis. 



Ahdomen 2. S. infrastigmalis, s. basalis, s. pedalis. 

 Segm. 8, 4, 5, 6. *S'. basalis, s. pedalis. 



„ 8. The caudal horn bears no other setae but the umbrella- 

 shaped ones, and is very short. Further one x. basalis, 

 just as on 9 and 10. 



Instar II. We only find the small tubercula and setae described 



for Smeriufhris tiliar and Spldnx ligustri. 



23 



