CYCLOPIDiE. 
193 
place, only the third pair of feet were more developed ; 
between the twenty-fifth and twenty-eighth, the first 
moulting took place ; and thirteen days afterwards they 
moulted a second time. 
In a series of experiments which I undertook, upon the 
same species, in the end of June and beginning of July, 
when the thermometer was frequently above 80° during 
the day, I found the time occupied in the process in some 
instances very much shortened. In one brood, which 
were hatched on the 21st of June, I found some had com- 
pleted their first moulting on the 1st of July, or on the 
eleventh day. In another brood, hatched on the 2 2d of 
June, I found the same result, several of the young having 
completed their first moulting on the 2d of July. On the 
4th I could only see one that had not moulted ; and next 
day, the 5th, this one had also undergone the change. 
The second moulting in many of them took place only a 
few days after the first. In another brood, hatched a 
little earlier in June, when the weather was not so hot, I 
found the changes took place as follows : When hatched, 
the insect appeared of an oval shape (t. XXIV, f. 7), having 
two thick antennae, of three articulations each ; two pairs 
of feet, bifid at extremity ; in the upper pair, one division 
consisting of two and the other of only one articulation ; in 
the lower, both divisions having only one articulation. 
Extremity of body furnished with two short setae on each 
side. On the eighth day (t. XXIV, f. 8), the body was con- 
siderably elongated, and a well-defined line now showed 
the distinction between this increase and original size. 
Some traces of setae also had appeared, where the third 
pair of feet afterwards spring ; intestine very distinct. On 
the fifteenth day (t. XXIV, f. 9), the third pair of feet had 
become visible ; the lower part of the body more elongated, 
the elongation marked by another line of demarcation. 
The setae on the edges of the antennae were now per- 
ceptible, and those of the feet longer and more numerous, 
whilst the second pair of feet had the upper division of two 
articulations. On the seventeenth day moulting had taken 
13 
