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 

 tlie 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 23d 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 antenuce, 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 setse 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 



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