the Growth and Habits of Carausivs morosus. 375 



time the last ecdysis has taken place. Segment 

 V breaks up into 4 to 7 divisions ; segments VI 

 and VII break up into 4 to G divisions, rarely into 

 7 divisions ; segment VIII into 4 divisions and 

 occasionally 6 divisions; segment IX into 3 

 divisions ; segment X into 2 or rarely into 3 

 divisions. In fact, the nearer we get to the apex 

 the less the number of sub-segments to the 

 original or pre-ecdysical segments. 



At the same time the original segments increase 

 in length, but not all to the same extent. Their 

 increase is shown in the following table. The 

 number of segments on the right and left an- 

 tennae of one and the same insect are not always 

 the same. 



I 

 II ¥1 II MUX 



•OS 7S ?5 72 t* -6 -6 MM 



Antennae on emergence x 5. 



Coincident with the growth of the antennae 

 the body (including head, thorax and abdomen) 

 increases from 10 or 11 mm. to 80 mm. (Tables 

 III and IV), or seven- or eight-fold. But if we 

 accept a length of 13"3 mm. as the starting-point 

 for growth after hatching out, then the increase 

 of the whole body in length is six-fold, the growth 



Table XIII. — Growth of the Antennae. 





U~ 



