84 
BULLETIN 
U. 
DEPAKTMEIO OF AGRICULTURE. 
fore visible from above. 
on T011112 vinifera vines. 
Fig. 6. — Phylloxera oitifoliae: Intermediate of 
type 2. ventral view. Much enlarged. 
In group 1 were two individuals collected 
One of them greatly resembled an adult- 
wingless radieicole. but be- 
sides the larval eye- it had 
two to three extra facets, and 
the antenna? and legs were 
longer than in the radieicole. 
The other was slender, re- 
sembling a prenymph in 
shape, and had about six ex- 
tra eye facets, and one an- 
tenna showed two sensoria. 
Group 2 (fig. 6) had six rep- 
resentatives, all with small to 
very small rudimentary wing 
pads invisible from above. 
In all cases the antenna? (fig. 
8) and legs were long, and 
one insect had two sensoria 
on antennal segment III. In shape the individuals resembled wing- 
Less radicicoles. One specimen (from TTyoining Red) had no extra 
eye facets, and the others from young vinifera? had a varying number. 
usually 1'). although one had about 15. The remaining individuals 
came under group 3 (fig. 7). 
and. because of their more pro- 
nounced nymphlike characters, 
these are more easily observed 
in life upon roots than are 
those of the other two groups, 
and I of the 6 individuals rec- 
ognized alive on roots were of 
this type. 
It is probable, judging from 
random collection-, that the 
insects of groups 2 and 3 are 
about equally abundant and 
each somewhat more so than 
those of group 1. All the in- 
dividuals of group 3 had rudi- 
mentary wing pads, in many 
cases almost as large as the wing 
pads of the nymphs. They bulged out from the sides of the insects, 
and were soft and appeared coiled (fig. 7) or curled. The com- 
pound eyes were well developed, there being from 66 to 100 per cent 
as many facets as in the nymphal eyes. In some cases the larval 
^s ^r^gi' 
Fig. 7. — Phylloxera vitifoliac: Intermediate of 
type 3. ventral view, much enlarged : an- 
tenna at right, more enlarged. 
