318 
23 
24 
25 
26 
27 
28 
29 
30 
31 
DRAGONFLIES OF NORTH AMERICA 
Dorsum of abdominal segment 2 blue with a black spot........ 
oho g ad ssc tek, ook ilayiag eGR Ca RR Tea ebrium, p. 332 
Superior appendages with the arms approximate, the inferior 
longer than the superior 0000 en ee a are 25. 
Superior appendages with the arms widely divergent, the superior 
as long as vtihe inferior sy. cay! 3.2 ubleel) ek eae pees ee 27. 
A line drawn through the long axis of the upper arm of the superior 
appendages parallel to a similar line drawn through the lower 
BN a he ah eet Se hig belie te Os cs ply os OS CUA ene, 
A line drawn through the long axis of the upper arm of the superior 
appendages meets a similar line drawn through the lower at an 
ACUTE AMaAle INN bail Cre aN OIE Ral her eA a a weewa, p. 333 
Abdominal segment 8-10 almost entirely pale blue............ 
SETA hes ONLI ARR Sas BP SRO ME EI Ad on Sy hd pallidum, p. 334 
Abdominal segments 8 and 10 black on the dorsum............ 
sears BORD Er an ale. Moreh! Aline vial hee ee Dalen ae antennatum, p. 334 
Dorsum of abdominal segments 4-5 more than half black...... 
a2 site i Meat a OE ee MR eh Abel ay carunculatum, p. 335 
Dorsum of abdominal segments 4-5 less than half black...... 28. 
Superior appendages with the tubercle projecting noticeably be- 
yond the dorso-caudal angles when viewed from the side...... 
BTL et eH MR en, pe NEA EOE Penner Lint (ANRC S93) doubledayi, p. 335 
Superior abdominal appendages not as above. Arms longer and 
maore diverment. 2230.02 Veek, se bse eee eee civile, p. 336 
With a clear tubercle usually present on the inner face of the 
superior appendages, usually visible in profile view between the 
arms of the appendage, but not always................... 30. 
Without. sucha tubercle. 94) 6 ian eet ac oe le one ae ele 32. 
Superior appendages in dorsal view, with a long basal tooth just 
beyond the point where the lower branch of the appendages is 
attached to the upper. Lower branch broad, angulate and flap- 
Mike seh i iy Pavan cE coll adie. hy Se RN Ree Ate culicinorum, p. 336 
Superior appendages in dorsal view without this tooth. Lower 
branch not flap-like, more or less pointed................. 31. 
Superior appendages with the apex of the upper arm direw ed back, 
lower arm with the apex directed posteriorly. .praevarum, p. 337 
Superior appendages with the apex of the upper arm directed 
ventrally, the lower arm directed in the same direction...... 
anna, p. 338 
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