97 



Se^m. 9 = 2, but 8. infrastiginalis fails. 



„ 10. S. dorsalis, a. sufhiontaluf and s. HNpntstigmalis on the 

 anal Hap, under it s. prmtigtiMlis; %, infrastigmalis is ab- 

 sent, one «. peditlis. 

 „ 11. Behind the anal flap is one tuherculuin helonj^inu: to 



the dorsal part of 8(>gincnt 11. 



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



skin is covered with the tubercula describwl for Sphinx ligustn. 



Recapitulation. The setal pattern of instar / quite agrees 



with that of Sphiiw lufustn^ only the a. tlormlaternles or the 



». Huprfuitigmdhs on the thoracic st^gments are wanting. 



The caudal horn just as in Spkit$j' lii/ustrl originates by a 

 niiHiian protuberance t»f aM. wgm. 8 under the left and right 



lk«tween thest* primary tubercula we find small umbrella-shaptnl 

 setae. 



In instar // this whole {lattern 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 ticular setae which have been replaced by small ones of the 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. July 1914. Plate IV, fig. 3 a, b. 



Instar /. I^ength 4 mm. 



The whole surface is covered with the small umbrella-shaped 

 setae, which I described for Stnerinthus tUiae. The primary 

 tubercula and setae are wanting except: 



Prothorfix. S. in frost ignialis^ one s. basalts. 



Mesothorax and metathorax. One s. hasalis. 



Abdomen 2. S. in frastig malts ^ s. basalis^ s. pedalit. 

 Segm. 3, 4, 5, 6. S. basalts, s. pedalis. 



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

 shaped ones, and is very short. Further one s. hasalis, 

 just as on 9 and 10. 



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

 for S)nennfhus tiliae and Sphinx ligiistn. 



7 



