TRAGARDH, OX DEVELOPMEXT OF CLITOSTETHUS ARCUATUS. 3 



If, in consequence, neither the larva described by Rey, 

 nor that of Hegeer, is the larva of Cl. arcuatus, it is on the 

 other hand highly probable that already Réaumur, this mar- 

 vellous and sagacious observer, has noticed it. 



Réaumur tells us^ that he found the larva of a beetle, 

 feeding on Aleyrodes (A. hrassicce) on cabbage, and he succeeded 

 in breeding it. The figare he gives of the beetle (Fig. 21. Pl. 25) 

 exhibits on the elytra a pair of dark spöts, as in many Cl. 

 arcuatus, and the figure lie gives of the larva (Fig. 20. Pl. 25) 

 resembles in all respects my fig. 2. Pl. I. 



Development. 



The eggs are deposited one and one on the under snrface 

 of those leaves of PkiUyrea which are infested by Aleyrodes 

 Phillyrea Haliday, and it very seldom occurs that more than 

 two are deposited on one leaf, and, when two, they are always 

 placed widely apart, one on each side of the median nervule. 



The eggs are 495 [J. long, 234 a wide and oval; they are 

 broadly rounded at both ends, of a milky-white colour and 

 have a polygonal structnre. 



I have not been able to ascertain how many days elapse 

 before the eggs hatch, because I could ne ver induce the 

 adults to lay eggs in captivity: biit one egg which I found 

 the 28 of March hatched the 6^^ of April, and thus required 

 a t least 8 days. 



First larval stage (Text fig. 2) 



The larva is, when newly hatched, nearly white and some- 

 what translucent; it attains then a length of 540 a. Låter 

 on it grows to a length of 675 u. and a width of 240 ;i. 



The larva is exceedingly slow in his movements and feels 

 his way very carefully with his legs, until he has got a good 

 footing, when he lets go his hold with the anal bristles, and 

 curves the tip of the abdomen forwards underneath the ab- 

 domen, fixes the anal feet firmly and repeats the same mo- 

 vements, thus marching along much in the manner of the 

 larvse of the Geometridse. 



The head (Textfig. 1) is small, rounded pentagonal on 

 dorsal vicAv, 7-^ as broad as the prothorax, and bent down- 

 wards at a right angle with the longitudinal axis of the body. 



^ Mémoires pour servir å THistoire des Insectes- Amsterdam 1737. 

 T. 2. Part. 2, p. 71. 



