RS 
To both the student and philosopher there is no more interesting 
family to study than the A4p/idide, and connected with their life histories 
are many scientific problems, that yet remain unsolved. 
The females of many of the species are viviparous, although some 
of these are now known to be merely the dimorphic or seasonable variety 
of an oviparous form, and some of these srodably change their food-plant 
and habitat as often as there are seasons in the year. 
The eggs of most of the Aphidide are long oval, but in some of the 
lower forms they are more or Jess spherical. Many of the species live 
in galls, others cover themselves with a wooly or flocculent secretion, 
while a few seciete a waxy covering for themselves analogous to that 
produced by the Coccids. 
The family may be divided into seven subfamilies, recognized by 
the aid of the following table : 
TABLE OF THE SUBFAMILIES,. 
A— Honey tubes always distinct, often quite long. 
Front wings with a double forked cubitus ; hind wings with two oblique veins ; 
ANCE ce! 7=) OlNTEM Ec se eee eee ee SUBFAMILY I. APHIDINZE 
B—Honey tubes very short, tuberculiform or subobsolete. 
Front wings with a double forked cubitus (except in Amycla Koch) ; hind wings 
with two oblique veins. 
Antenne 7-jointed, the 7th joint setaceous, not rudimentary..... Ore os 
SUBFAMILY II]. CALLIPTERIN 42 
Antenne 6-jointed, usually with a spur or rudimentary 7th joint........... 
SUBFAMILY III. LACHNIN 42 
C--No honey tubes. 
Front wings with cubitus once forked ; hind wings with one or two oblique 
veins. 
Antennze 5-701 O=jomnted ane. eee SUBFAMILY IV, SCHIZONEURIN/A® 
Front wings with cubitus not forked ; h:nd wings with one or two oblique veins. 
Jair S) ouole Oona 5ayogae osu: SUBFAMILY V. PEMPHIGIN A& 
Front wings with only three veins. 
Antennee 5-jointed ; hind wing with a subcostal nerve and an oblique vein. . 
SuBrAMILY VI. CHERMESIN 42 
Antenne 3-jointed ; hind wing with a subcostal nerve and no oblique vein... 
SUBFAMILY VII]. PHYLLOXERIN 42 
SUBFAMILY I. APHIDINZ. 
TABLE OF GENERA. 
1 Antenne notion frontal tubercless. 2. oc ccs aleatepscios © + 84) siecle) a ee eee 4 
Antenne on frontal tubercles, 
Antennz not approximate at base ; frons not grooved, flat or convex......... 2 
Antenne approximate at base ; trons grooved..... G, 1. Siphonophora Koch 
2 First antennal joint with a tooth on the inside .......... G. 2, Phorodon Pass. 
First antennal joint without a tooth on the inside. 
