PICTORIAL KEY TO ANISOPTERAN NYMPHS OR LARVAE 
SUPPLEMENT TO PSYCHE 
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 ol New Eng- 
land” i Mem. Thoreau Mus. Nat. Hist., II: Nymphs. Part 
2.) it is hoped will arouse an interest in the study of the 
lan * 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 larvs collected in new England. 
EDITOR S NOTE. This is the second one or Dr. Howe* charts to be 
dutnbuud with PSYCHE. The first. relating ,o Zycoptcr*. wss in- 
eluded in the issue for October, 1918 (Vol. 25. No. 5). 
.\SI>OPTEH \ - 
labium 
Antenna four jointed. Labium with 
medium lobe undcfl (* entire) 
PHOflOUI’IU'M 
Terminal (4th) segment of antenna 
rtcuned, .'lender, ns long as third 
segment is wide 
Terminal (4th) segment of antenna 
orbicular or discoid, or rudimen- 
tary when much thorlcr than third 
segment is wide (sec figure under 
Gompiiinae) 
Gouriiua 
Lateral labial lobe with lharp, incurred hook 
nt npex, or at lensl nerer rounded at apex 
Abdominal segments H and 0 tcith 
prominent apical spine 
OrnioooMPHCB 
Lateral labial lobe rounded nt npex 
Abdomen circular in outline almost 
as wide as long 
Abdomen orate or lanceolate in outline at leaet twice ns long os wide 
IIagexius 
An ax 
Gomi'Haescuna. Mature larva unknown 
Hind margins of head rountled 
nr tubangular 
Lateral spines only on abdominal 
segments sewn to nine 
Literal spinra on abdominal segments 
Jour . /worsts to nine 
•Vo dors.,1 books on abdominal 
segments 
NaMOSWUNA 
Mortal hook, 0 n abdominal segments 
»etrn to “i |ir 
Literal spines on abdominal segment* /Ire nr sir to 
EnAKBCHNA 
Literal spinet on abdominal segments jour to nine 
Basiaeschna 
A|>ex of lateral labial lobe acute. Labium 
untootked on either side of median cleft 
A|ie\ of lateral labial lobe blunt labium UuOted 
on either title of median cleft 
