1955] 
Gibbs — Females of Enallagma 
11 
of antennae; postocular spots elongate, comma-shaped, 
connected by a narrow, pale occipital bar, not quite reach- 
ing the ocular margins; face pale except postclypeus black 
with pale margins; mouthparts and rear of head pale; 
antennae black, apices of first and second segments pale. 
Prothorax: Front lobe pale bordered with black; middle 
lobe black dorsally, pale laterally, a dorsolateral pale spot 
present on each side and variable in size, a pair of prom- 
inent dorsolateral pits present near the caudal margin; 
hind lobe black with pale lateral margins, caudal margin 
convex and entire. 
Pterothorax: Pale with black middorsal stripe occupying 
about half the mesepisternum and slightly narrowed pos- 
teriorly; black humeral stripe slightly narrower than pale 
antehumeral stripe, of about constant width throughout, 
but with a slight widening posterior to the mesinfraepis- 
ternum; first lateral stripe represented by a mere posterior 
vestige; metapleural suture covered by a thin second lat- 
eral stripe, which expands posteriorly into a spot; humeral 
and middorsal stripes connected posteriorly by the black 
of the antealar carina and sinus, which fades slightly 
laterad of the humeral stripe. Coxae and trochanters en- 
tirely pale. Femora and tibiae pale, each with a black 
external stripe for almost the entire length; tarsi pale, 
each with distal end of third segment dark; spines of legs 
black; claws pale with black tips. 
Mesostigmal laminae: Widest in mesal half; a closed 
mesal concavity present, deepest posteriorly; the entire 
lateral half twisted and upturned at an angle of 60 degrees 
or more; most of lateral half pale; separated from the 
thoracic depression by a posterior groove for its lateral 
half only. 
Wings: Venation black or dark brown; pterostigma light 
brown. M 2 arises between the 4th and 5th postnodal cross- 
veins in the front wings, between the 3rd and 4th in the 
hind wings; postnodals 9-12 in front wings, 8-10 in hind 
wings; M, a arises at about the level of the 8th postnodal 
in both wings. 
Abdomen : Pale with black as follows : Segment one, a 
squared middorsal spot on basal half, a small apical spot 
