LECANIUM HESPER1DUM. 81 



to the segments ; the evolution of the spermatozoids is 

 effected, the testicles are clearly distinguished, com- 

 pressed by the development of the rudiments of the 

 organs. At the third stage, which represents the 

 perfect insect, all the salient organs which characterise 

 the adult are present. But the young male has no 

 trace of eyes, and its skin remains very tender, strongly 

 contrasting with the chitinous integument and the 

 well-developed eyes of the young females, which are 

 found at the same time in the body of the mother. 



" The summary of these observations is thus given : 



" ' The male of Lecanium hesperidum, among all 

 those hitherto known, is therefore characterised by its 

 minute size, the form of the penis, the absence of eyes 

 and wings, the character of the integument, and the 

 development of the spermatozoids before the appear- 

 ance of members, at a stage which doubtless corre- 

 sponds to that of pupa.' 



" Then follows a statement of the progressive 

 development of the organs, leading to the conclusion 

 that 



" 4 The organization of the male does not permit a 

 doubt that there is pairing, but I have not been able 

 to decide if it takes place within or without the body 

 of the mother. I could not find a male outside of the 

 mother, not even under her body, but its imperfect 

 condition rather induces me to suppose that the 

 females are fecundated within the maternal organiza- 

 tion. 



" ' If , however, we consider that the spermatozoids 

 are mature in Lecanium hesperidum at the time when 

 the males are yet without relative organization, we 

 cannot but think that there is here a transitory state, 

 or even a still lower degree of development, which 

 may be definite in some species of the same family or 

 any other group. We may even conceive that the 

 males may be rudimentary in such a manner that they 

 may be reduced, in the body of the mother, to sexual 

 elements, and thus there may be produced there a 



VOL. II. 6 



