122 Bulletin de la Société Entomologi que d'Egypfi 



shown in figs. 4 and 5 are exactly 8 mm. long; that 

 of the adult mal(> is on the average 18 min. Inng, so 

 that from the time of moulting the male antenna 

 ahout douhles in length. 



This iuerease can be attributed to two factors. 

 There is first of all a general expansion of the 

 surface which takes place, probably very rapidly, as 

 soon as the antenna is freed. In insects in general 

 it is immediately after the moults that an increase 

 in size is observed. The expansion of the integument 

 is not however sufficient to explain a doubling of 

 the length. By comparing lig. 4 drawn i'r;)«!! a male 

 which died in moulting with fig. i drawn from an 

 adult male with the same magnification, it is easily 

 seen that the joinis have altered very considerably. 

 This is apparent even at the base, where for example 

 the '.md joint of the larva is less long than bioad 

 whereas in the adult it is much longer. The 3rd. 

 joint owing to its multiple divisions is reduced in 

 the larva to a much flattened ring w^hile in the adult 

 it is nearly as long as the îînd. Joints i8 to Vi multi- 

 plied by 7o in fig. ^j are together 4 cm. long, with 

 the same multiplication they would be three times 

 as long in the adult. Such differences can only be 

 explained by the action of a second factor : growth, 

 which continues even after the moidt (l). TfiCst« 

 facts still very little known deserve more carefid study 

 than they have received in the past. For example the 



(1) Perliaps it would bo more accurate to con.sider tlu' 

 whole process as expansion. It is probable that true 

 growth, that is cell multiplication, does not contiimc after 

 the moult (.Author and Translator). 



