374 



Mr. H. Ling Roth's observations on 



it, thus : a stick insect measuring, say, 33 mm. will have 

 passed its second moult, and so on. 



The Insect's Length. 



The length of the individual full-grown insects varies 

 very considerably, as the following Table of the summary 

 of the measurements of 354 mature insects shows. These 

 insects were the whole of the surviving progeny of oneparent, 

 measured as soon as they themselves began to drop eggs. 



Table XII. 



-Lengths of Full-grown Insects- 

 " Original " Female. 



-Bred from 



The range in the length of the adult insects is therefore 

 14 mm. from a minimum of 72 mm. to a maximum of 

 86 mm. I have no other records which exceed the above 

 maximum of 86 mm., but I have two records which do 

 not come up to the above minimum of 72 mm., viz. No. 

 42, an almost black insect and a very good egg-producer, 

 which measured only 69 mm., and No. 159, a runt, which 

 both ate and produced little and was only 62 mm. in length. 



The Growth of the Antennae. 



In connection with the body growth, as illustrated by 

 the successive ecdyses, it is interesting to note the growth 

 of the antennae. When hatched out the nymph's antennae 

 consist of ten segments, the joints of which can nearly all 

 be distinguished by the naked eye. Under the microscope 

 on segments IV, V and VI, counting from the base, are 

 to be seen indications of further segmentation, which de- 

 velops with successive ecdyses. The three basal segments 

 increase in size, but do not subdivide. Segment IV gets 

 broken up into as many as 10 very distinct divisions by the 



