78 ON THE AGAMIC REPRODUCTION AND MORPHOLOGY OF APHIS 
geodephagous Coleoptera and Hemiptera. They have been figured 
in Lepidoptera by Herold, Meckel, Thompson, and Stein, in Dzptera 
by Stein and Leuckart, and in Coleoptera by Stein. 
Secondly. In September last I received the fourth Part of the 
fourth volume of Moleschott’s ‘Untersuchungen, which contains a 
long and remarkable Essay by Leuckart, “Zur Kenntniss des Genera- 
tions-wechsels und der Parthenogenesis bei den Insekten.” The first 
article in the memoir is on the “ Alternation of Generations in the 
Aphides.” The author describes at length, and figures, the female 
reproductive organs of Aphis Padi, and although the arrangement 
of these organs is somewhat different from what obtains in my 
Vacuna, 1 am happy to say that his account of the ultimate struc- 
ture of the ovaries essentially coincides with mine. The view which 
Leuckart takes of the relation of the ova and agamic germs (p. 346) 
is also in close agreement with my own. I lay the more weight upon 
these coincidences because Professor Leuckart’s observations must 
have been made at the same time with, and were of course wholly 
independent of, mine. 
Lastly, not having the works of either Kaltenbach or Koch at 
hand when my memoir was read, I abstained from attempting to 
‘give the specific names of my Apszdes. I have no doubt now that 
the viviparous form is the Aph?s Pelargonit of Kaltenbach, especially 
as my friend Mr. Dallas, who has paid particular attention to the 
FHlemiptera, is of that opinion. The oviparous female resembles so 
much in form and habit the Vacuna dryophila of Schrank, that I have 
little doubt it is really that species, though, when carefully examined, 
the antenne are found to have six unquestionable joints, and seven, 
if the swollen base of the last division of the antenne is to be re- 
garded, as I believe it should be, as a distinct joint. The eyes also 
have a small and inconspicuous tubercle; and the promuscis is not 
nearly so long as either Kaltenbach or Koch states—Wov. 16, 1858. 
