130 
BRITISH APHIDES. 
also in the male. In the apterous female they are of a 
beautiful green colour. When expressed into water, 
they assume curious botryoidal shapes, which soon 
afterwards undergo crystallization, the change com- 
mencing from the centre, and finally rendering the 
whole mass solid. 
The oviparous apterous female. 
This sex appears usually some few days after the 
exclusion of the male from its chrysalis. The ova are 
indeed still rudimentary when the male is fully on the 
wing. Probably the last insect continues for some 
weeks to hover over the companies of females. 
Balbiani employed this insect most successfully in 
the study of the organs connected with reproduction. 
He repeatedly saw the process of oviposition, and was 
enabled to watch the changes which take place in the 
egg after fertilization. 
He states that by laying the egg in olive oil the 
outer membrane becomes sufiiciently transparent to 
see the contents ; and, further, he says that if air be 
not excluded by the use of too deep a stratum of oil 
the vitality of the egg is scarcely, if at all impaired. 
I 
SiPHONOPHOEA ciEOUMFLEXA, Bucktofh, Plate XIII. 
Apterous viviparous female, 
Indies 
Size of body 0*070 xO’030 
Length of antennm 0*075 
,, cornicles 0*015 
Millimetres. 
1*77x0*76. 
1*89. 
0*38. 
Oblong oval, smooth, shining. Bright green. Head 
broad, vertex flat. Antennge dark at their tips and 
placed on large frontal tubercles. Thorax deeply 
pitted, with two black or dark olive spots on each 
side. Postrum rather long, reaching to nearly the 
third coxse. Abdomen broad between the cornicles. 
