30 ON THE AGAMIC REPRODUCTION AND MORPHOLOGY OF APHIS 
provided with legs, proboscis, and antenne. It was only in Novem- 
ber that the apterous females presented eggs in their ovaries and 
oviducts, and, for that effect, a considerable degree of cold was 
necessary.” ! 
Morren describes the male, female, and agamic organs of repro- 
duction, but less completely than Von Siebold, who, in 1839,? care- 
fully investigated the Aphzs Lonicere, and first demonstrated the 
existence of the spermatheca and colleterial glands in the oviparous 
females. Von Siebold distinguishes three forms of this species—two 
winged and one apterous. The large winged Ap/zdes were all vivi- 
parous; the smaller, males. The apterous forms were oviparous, and 
the progeny of the alate females. 
Steenstrup says of the <Aphzdes (‘Alternation of Generations,’ 
p- 108), “The propagation of these creatures through a series of 
generations has been already long known. In the spring, for in- 
stance, a generation is produced from the ova, which grows and is 
metamorphosed, and without previous fertilization gives birth to a 
new generation, and this again to a third, and so on, for ten or twelve 
weeks ; so that in certain species even as many as nine such pre- 
liminary generations will have been observed ; but at last there always 
occurs a generation consisting of males and females, the former of 
which, after their metamorphosis, are usually winged ; fertilization and 
the depositing of eggs take place, and the long series of generations 
recommences in the next year and in the same order.” 
In the first edition of Professor Owen’s ‘ Lectures on the Inverte- 
brata,’ published in 1843, however, Morren’s errors are adopted, 
extended, and enunciated as the law of propagation of the Aphides, 
in the ‘following terms :— 
“In the last generation, which is the seventh, the ninth, or the 
eleventh, according to the species of Aphis, the fertilizing influence 
would seem to have expired,? and developmental force exhausts itself 
in more frequent and numerous moultings, in the formation of wings, 
and in the modification of the female organs already described, 
* “Or chez le puceron du pécher j’ai vu un grand nombre de fois, et j’ai montré le 
phénoméne 4 mon collégue, M. Burgraeve, que la femelle ailde et propre a la fécondation ne 
renfermait point des ceufs et n’en pondait point, mais qu’elle renfermait des petits pucerons 
vivants qui naissant tout développés avec leurs pattes, leur trompe, et leurs antennes. Ce ne 
fut qwen Novembre que les femelles sans ailes présentaient des ceufs dans les ovaries et les 
oviductes, et pour cela il fallait un froid déa assez vif.” —Morren, Zc. p. 76. 
? Ueber die inneren Geschlechtswerkzeuge der viviparen und oviparen Blattlause. 
Froriep’s Neue Notizen, 1839. 
* This phrase is little more than a translation of a passage in Morren which will be given 
below. 
