14 
15 
16 
17 
18 
19 
20 
21 
22 
ENALLAGMA . 317 
Dorsum of abdominal segment 9 pale blue or orange......... 15. 
Dorsum of abdominal segment 9 black. Pale postocular spots 
linear, not confluent with the pale color of the rear of the head. 
Pale antehumeral stripe narrower than the black humeral stripe 
One MATER ee a, TR eee eed Tort EY > MCR ECPEE CNR, Oe 19 
Pale postocular spots directly confluent with the pale color of the 
rear of the head. Middle prothoracic lobe predominantly pale 
Gnrdorsina’. | Pe OUe NT RE BM Os HOT laurenti, p. 327 
Pale postocular spots not directly confluent with the pale color of 
the rear of the head, although they may be indirectly confluent 
therewith, by way of, the pale postocellar stripe. Middle 
prothoracic lobe predominantly black on dorsum.......... iG. 
Pale antehumeral stripe narrower than the black humeral stripe 
NE EA MALT RAC Tear A SG ohA eae OE RAE GEN METS Ii. 
Pale antehumeral stripe as wide as, or wider than the dark humeral 
STAY CTE ARUP et Ae RE ee eM ORRIN TD BTA ica hes PD nee 18 
Ninth abdominal segment orange.............. pollutum, p. 328 
Ninth abdominal segment blue................ sulcatum, p. 329 
Ninth abdominal segment yellow.............. signatum, p. 329 
Ninth abdominal segment blue............... vesperum, p. 330 
The two basal joints of the antennae black. No pale spots about 
PMesOve ieee: ees hale Se eee rsh eG Ge dubium, p. 330 
The two basal joints of the antennae pale. Two light spots be- 
tween the lateral and median ocelli...... ................ 20. 
Second lateral thoracic (metapleural) black stripe abruptly nar- 
rowed at three-fourths to two-thirds its length to a narrow line 
+ LS Ree Raa eae MM tue, Mtr an Pa oe gah ye th Sg cele pictum, p. 331 
Second lateral thoracic black stripe uniformly widening from an- 
terior to posterior end... 24) Ci) 2 At Pa concisum, p. 332 
Superior abdominal appendages with the inferior arm as long or 
ignger thant Ghe/smaperion. conn 2). cis ae heres ba oho es ee 22. 
Superior abdominal appendages with the superior arm always the 
longer, the inferior arm short and in some species assuming the 
form: Of a basal spine. OF GAD. 2. Bocce soe ee eee 29, 
Without a clear tubercle between the arms of the superior abdom- 
Ae ATI PCMAG EDs 2 ans. ashe eatd bia: ice te Lee 23. 
With a clear tubercle between the arms of the superior abdominal 
Semen capes wee 2 is teh hee Tee wae the ane co ee ae ees 26. 
