1918] Smulyan—First Instar Stem Mothers of Three Species of Aphids 21 
cated, and varying in extent from beyond end of body to some- 
what short of end of same; rostrum varying in extent from nearly 
to end of body to about metacoxa (relative length varying, like that 
of antenne and cornicles, with the state of advancement of the 
insect—telatively shorter with feeding and consequent enlargement 
of body); legs armed with spinelike hairs, anterior tibizw .1540— 
1848 mm., intermediate tibiz .1617-.1925 mm., metatibize 
.2002—.2464 mm.; anterior tangent of head usually faintly tri- 
lobed; eyes somewhat large; usually a pair of minute tubercles on 
each of last two segments (within transverse dusky lines or bands), 
and very often apparently a median double row of very minute 
tubercles or dots on remainder of dorsum, a pair on each segment; 
length of body .4620—-.8316 mm., width at widest part .2464-.4312 
mm. 
2. A. pomi DeG. (Green Apple Aphis). 
Dark green (well fed individuals may be lighter), anterior and 
dorsal aspects of head dusky to blackish with a pale or uncolored 
median longitudinal, often quite wide, band or stripe (when latter 
condition obtains the dark or dusky portion appears as two elon- 
gate spots); antennz, base of rostrum, and legs dusky, tips of 
femora, distal portions of tibise, and tarsi quite often blackish; 
more or less of cornicles, and about 4 distal portion of rostrum black 
or blackish; eyes black (in mounted specimens deep red); caudal 
end of abdomen ventrally sometimes faintly 
dusky; whole insect often slightly pruinose. 
Newly-hatched specimens are bright dark 
green, with head and more or less of anterior 
portion of thorax as a rule lighter and usually 
with a yellowish tint; antennze, rostrum, and 
legs with a cast of the color of the body, tips 
of femora and of tarsi and distal portions of 
some of the antennal segments very often 
darker green; femora usually distinctly yellow- 
green. 
Antenne reaching from end of second seg- A 
ment to end of thorax, base and unguis of last Fig. 2. — Antenna 
segment equal or subequal (the inequality is 2d cornicle of Aphis 
é 4 ; : wz DeG., ab t 
slight when the specimen is not too highly SPs0: eng BENG a 
