1886.] Larva of Smerinthus ocellatus and its Food-plants. 143 



they were very small. Nevertheless it is improbable that there would 

 have been any change from this strongly marked tendency. 



6. Salix viminalis. — One larva (hatched July 11th) was well in 

 the last stage when it was examined on August 16th ; it was a 

 whitish variety with tendencies towards intermediate. The larva was 

 further examined on August 20th and 27th, and on the last date was 

 slightly on the white side of intermediate. This is the last note upon 

 the larva, which must have been full fed by this time. 



7. Salix viminalis. — Five larvae (hatched July 10th) were examined 

 on Augast 20th, when one had ceased feeding a few days before, 

 three were nearly full fed, while one was small. All were slightly on 

 the white side of intermediate. The larvae were again examined on 

 August 27th, when only two were still feeding, but were practically 

 mature, and were very slightly on the white side of intermediate. The 

 small one had died. The results are final as regards the other four larvar. 



8. Salix viminalis (the leaves sewn so as to expose the under sides 

 only). — One larva (hatched July 10th) was examined on August 12th, 

 when it was in the fourth stage, and very white. It was again 

 examined on August 27th, when it had been fed for about a week on 

 the ordinary unsewn leaves of S. viminalis. It was well in the fourth 

 stage and strongly white. The larva died shortly afterwards, but it is 

 probable that the colour would not have changed. 



9. Salix alba. — Two larvae (hatched July 14 and 15) were examined 

 on August 12th, when one was in the fourth stage and the other was 

 well in the last stage. They were intermediate varieties, or perhaps 

 rather on the yellowish side. On August 16th the younger one was 

 dead without further change, and the older larva was examined on 

 August 16th, 20th, and 27th, remaining on the yellowish side of inter- 

 mediate until its death on the last of the above-mentioned dates. 



10. Salix Smithiana. — On August 12th four larvae (hatched 

 July 10th) in the last stage were examined, and were found to be 

 on the white side of intermediate. By August 20th three were dead, 

 and the remaining larva was examined then and on the 27th. On 

 the last date the larva was well in the last stage and slightly on the 

 white side of intermediate, this being the last note taken, and certainly 

 representing the final effect of the food. These larvae were fed for a 

 considerable time npon the upper twigs (bearing large leaves) of the 

 doubtful species of Salix mentioned in the note on p. 301 of the 

 paper quoted above. Such leaves were indistinguishable from those 

 of S. Smithiana. 



11. Salix cinerea. — Two larvae (hatched July 10th) were examined 

 August 16th, when one was well in the last stage and one in the 

 third. The former was intermediate, the latter too young for any 

 certain results. On August 20th the younger larva was dead, the 

 older one being still intermediate, while upon August 27th it was 



