14 
Psyche 
[March 
11 and 9; M la arises at about the level of the 7th to 9th 
postnodal crossvein in the front wings, about the 7th or 
8th in the hind wings, the majority arising at the 8th in 
both wings. 
Abdomen : Pale with black as follows : Segment one, a 
middorsal basal spot and a lateral apical transverse dash ; 
segment 2, entire dorsum, constricted or narrower in an- 
terior half, connected with an apical ring; segments 3-7, en- 
tire dorsum, abruptly constricted basally, slightly widened 
anteapically, connected with an apical ring; segment 8, 
a narrow middorsal line abruptly widened to cover apical 
dorsum; segments 9 and 10, entire dorsum. Midventral 
sternal carinae black on 1-8. Anal appendages and valves 
and styli of ovipositor pale; apex of each valve of ovi- 
positor, to base of stylus, extends not quite to apex of 
segment 10 excluding appendages. Ventral spine of seg- 
ment 8 black or dark brown, sharp. 
Measurements: Total length to apex of segment 10, ex- 
clusive of appendages: 26.8-28.2 mm.; length of abdomen: 
21.0-22.2 mm.; length of front wing: 16.1-18.0 mm.; length 
of hind wing: 14.7-16.9 mm. Taken from four Cape Cod 
specimens and one from Long Island. The Long Island 
specimen is represented in each measurement by the smal- 
ler extreme. 
Described from 11 specimens from the following lo- 
calities: Flax Pond, North Falmouth, Mass., June 17, 1951 
(3), June 16, 1953 (5), and Jabinette’s Pond, West Yar- 
mouth, Mass., June 13, 1953 (1), all collected by the 
writer; and Riverhead, Long Island, New York, May 29, 
1953 (1), June 2, 1953 (1), collected by Mr. Roy Latham. 
Key to Females of Ten Species of Enallagma 
Based Principally on Mesostigmal Laminae 
In the key which follows, the females of ten species of 
Enallagma are compared. These ten comprise those which 
might be confused for one reason or another, or which 
may be closely related to laterale or recurvatum. Relation- 
ships among the species of Enallagma are difficult to de- 
termine and, to date, have been largely based on the form 
