the Growth and Habits of Carausius morosus. 357 



Table VI. This table, in which the insects are arranged 

 according to their length, gives the total egg-production per 

 insect, the average daily production per insect, and the 

 average production per millimetre length of the insect. 

 It also gives the days lived in the First Period of life or 

 that of growth from hatching out to, and inclusive of, the 

 last moult, and the Second Period, or that of reproduction 

 and decay, from the last moult to death. 



Before going into details it may be as well to point out 

 the peculiarities of some of the insects which, if abnormal, 

 may have affected their duration of life and egg-production. 



The " Original " with 346 days of life was a very good egg- 

 producer, but with a low average per day. Her life may 

 have been prolonged by the fact that the temperature of 

 the room in which she was observed was not kept up to 

 an average of over 16° C, as I was then under the impres- 

 sion that these stick insects were European and not Indian. 

 But this explanation (of more than the normal number of 

 days lived in the Second Period) cannot hold good for 

 No. Ex. 18, her grand-daughter, which suffered from an 

 external blood clot * and lived the longest of any in this 

 period. No. 22 had two constricted abdominal segments. 

 No. 159 was anomalously short, being 62 mm. long, which 

 is very much below the average length of the fifth moult ; 

 whether she had grown with less than the usual average 

 increase at each ecdysis, or had not completed the whole 

 six, I am unable to say ; but it is quite likely she had only 

 moulted five times, for dissection shows eggs already formed 

 in stick insects which had not yet passed the last moult. 

 No. 42 was brown, almost black, and not a descendant of 

 the " Original," but belonged to the same lot ; she lived 

 29 days after dropping her last egg. No. 94, which was 

 also under observation for food consumption and ate about 

 20% less food per day than the others, had a short life and 

 a low egg-production. No. 89 lived 28 days after dropping 

 her last egg. No. 38, like No. 42, was also nearly black, 

 and not a descendant of the " Original," but she was a 

 better egg-producer and long-lived in the Second Period; 

 the same applies to No. 39. No. 83 was only a tolerable 



* Exudation of blood from the thorax in Orthoptera lias been 

 observed by Ch. Hollande and has been named by him Autohemor- 

 rhee; he ascribes it to a break caused by pressure on the small 

 exsertile chitinous vesicles which are not provided with retractile 

 muscles (Archiv. d' Anatomic Microscopique, xiii, 1911-12, p. 299). 



