142 



Mr. Poulton's notes in 1885 xipon 



in this stage affords an interesting contrast with the 

 smaller development of this feature in later stages (com- 

 pare fig. 10, Plate VII., in the ahove quoted paper, for a 

 representation of the apex of the horn in Sphinx ligustri 

 in the third stage). It is noteworthy that the two 

 terminal bristles are larger and much stouter than any 

 of the others, and there is the faintest approach to the 

 development of clavate extremities. None of the longer 

 bristles were forked upon this part of the horn in the 

 individual which was figured, but it is common to find 

 such bristles with a small and simple apical fork (as 

 described in the paper previously mentioned). The 

 small bristles generally end in a remarkable quadrifid 



Fig. 1. 



expansion, of which the four processes are here com- 

 paratively short, although in some parts of the body of 

 the larva they are greatly prolonged, and thus produce 

 a most extraordinary apj)earancc when the profile of the 

 larva is examined under a compound microscope, 

 magnifying 50 or 100 diameters. The figure serves 

 well to indicate the difference between the two kinds of 

 bristles which occur on the body of the young Smcrintlius 

 and Sp)hinx (and probably other) larva3, and of which 

 the tubercular bases bear an im])ortant part in the 

 markings. The long bristles on the part of the horn 



