R. Heber Howe, Jr.
Pictorial Key to Anisopteran Nymphs or Larvae (chart 17x22 inches).
Psyche 29(supplement):1, 1922.

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TO ANISOPTERAN

PROGOMPHU~

PICTORIAL KEY
NYMPHS OR LARVAE
GOMPHINAE. Burrowing Larvae
VOLUME 29, OCTOBER - DECEMBER, 1922.
ODONATE LARVAE OF NEW ENGLAND.
BY R. HEBER

HOWE,

JR.
T
HE accompanying pictorial key which will be published also in the author's "Manual of the Odonata of New Eng- land"

(Mem.

Thoreau Mus. Nat.

Hist.,

11:

Nymphs, Part

2.)

it is hoped will arouse an interest in the study of the larvae of these interesting insects. For the use of two dia- grams, I am indebted to Mr.

C.

B.

Wilson and the Bureau of
Fisheries. I shall be glad to receive for study and determin- ation larvae collected in new England.
EDITOR'S NOTE. This is the second one of Dr.
Howe's

charts to be
distributed with PSYCHE. The first, relating to Zygoptera, was in- cluded in the issue for October, 1918

(Vol.

25, No. 5).
Abdominal segments 8 and 9 without or
with only a rudimentary apical spine
Lateral labial lobe with sharp,

incurved

hook
at apex, or at least never rounded at apex Terminal (4th) segment

of

antenna

recurved,

slender, as

long

as

third

segment is wide
Antenna four jointed. Labium with
medium lobe

unclejt

(= entire)
Abdominal segments 8 and 9 with

prominent

apical spine

AESCHNIDAE

(excluding

~ORDULEG.~STERINAE)

Showing

$ut

labium closed, not hiding face.
Labium extended
Abdomen ovate or lanceolate in outline at least twice as long as wide
HAGENIUS

Terminal (4th) segment

of

antenna

orbicular or discoid,

or

rudimen-
tary when much

shartbr

than

third

segment is wide (see

figure

under

GOMPHINAE)
Lateral labial lobe rounded at apex
Labium flat, without raptorial (= lateral and mental)

set%

Abdomen circular in outline almost
as wide as long

ANISOPTERA

GOMPHAESCHNA.

Mature larva unknown

LIBELLULIDAE

(including

CORDULEGASTERINAE)

Lateral spines only on abdominal
segments seven to nine
Lateral spines on abdominal segments five or six to nine
SIio-fting

spoon-shaped

labium

closed, hiding face. Labium extended

Hind

margins of head rounded
or

subangular

ERAL

SETAE
Lateral spines on abdominal segments

four

to nine
PET

~UJRINAE.

Mud-loving Larvae

AESCIIINAE.

Climbing Larvae
Lateral spines on abdominal segments

four,

fire or six to nine
Apex of lateral labial lobe acute. Labium
untoothcd

on either side of median cleft
Lateral labial lobe toothed only on inner
nia

Antennae slender
No dorsal hooks on abdominal
segments
Labium spoon-shaped, with raptorial

(=

lateral and

mental)

set=

(see Key to

LIUELLUI~IDAE)

LABIUM
Apex of lateral labial lobe blunt. Labium toothed on either side of median cleft
Antenna seven jointed. Labium with
medium lobe cleft
Lateral labial lobe toothed on inner an
terminal margins. Antennae stout
Dorsal hooks on abdominal segments
seven to nine

Hind

margins of head acutely angular




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