TABLE FOR CLASSIFYING INSECTS (class Insecta) INTO ORDERS
Order
A_{1} Biting Insects; mouth parts for grasping
and biting
B_{1} Wingless; changes (metamorphosis) No Wings
incomplete (Aptera)
B_{2} Under wings thinner than upper wings, Fan Wings
and fold like a fan beneath them; changes (Orthoptera)
incomplete
B_{3} Upper wings hard and thick, protecting Sheath Wings
under wings, which fold both lengthwise (Coleoptera)
and crosswise beneath them; changes
incomplete
B_{4} All four wings nearly alike, finely veined,
transparent
C_{1} Hind wings smaller than fore, two Nerve Wings
or three filaments attached to abdomen, (Neuroptera)
antennæ long; changes complete
C_{2} Hind wings not smaller than fore; False Nerve
no filaments on abdomen, antennæ Wings
inconspicuous; changes incomplete (Pseudoneuroptera)
A_{2} Sucking Insects; mouth parts for sucking
or licking
B_{1} Basal half of upper wing usually leathery, Half Wings
other half of wing transparent; lower lips (Hemiptera)
transformed into a tube; true bugs
B_{2} Four wings covered by scales, holding-jaws Scaly Wings
(maxillæ) elongated to form a sucking (Lepidoptera)
tube coiled under head; changes
complete
B_{3} Four wings, membranous, hind wings Joined Wings
hook to fore wings in flight; mouth parts (Hymenoptera)
for both biting and sucking; abdomen
with sting; changes complete
B_{4} Two wings, mandibles rudimentary, Two Wings
mouth a soft beak (Diptera)
B_{5} No wings, mandibles rudimentary, mouth Lost Wings
a horny beak (Siphonoptera)
