82 
10 
11 
12 
13 
14 
15 
16 
DRAGONFLIES OF NORTH AMERICA 
Abdominal segment 9 shorter than 8; expanse less than 60... .4. 
Abdominal’ segment 9 as lane as cee ee ee a es ce 
Thoracic stripes of the first pair widened forward to form a tri- 
angle that is broader than the bordering pale color......... 5. 
These stripes little widened forward, narrower than the bordering 
pale, colors 's.°. /: SVARONe BILE s eee ae ere tera ae etd Le 6. 
Stripes 4.and 5 narkowsf 3 snqenalk See parvidens, p. 89 
Stripes 4 and 5 broad’ 34) }.oo. ds ee alleni, p. 89 
Labrum with a median cross stripe; femora not pale beneath 
brevis, p. 88 
Labrum with black border but no median cross stripe; femora 
DaleIDENEstIe hee ota cas owt occas eae ae eee viridifrons, p. 89 
With a single pale brown stripe across top of frons 
cavillaris, p. 105 
With black stripes on sutures of face...................205. 8. 
Expanse more) than 60st. <i. c/4ee eh ss oes eee ee 9. 
ixpanse less than 75... /../{4getiee. 2. sles oo ee 10. 
Stripe 4 continuous; sides of stripe one diverging; fronto-clypeal 
stripe’a broad hand’. Ja: 7 ee. feo ie Sek ee dilatatus, p. 97 
Stripe 4 interrupted; sides of stripe one parallel sided; fronto- 
clypeal stripe a narrow line................ lineatifrons, p. 98 
Stripes 4 and 5 coalescent; base of femora yellow. .abditus, p. 110 
Stripes 4 and 5 separate; base of femora blackish............ 11. 
Labrum bordered with black and with a transverse black stripe. 12. 
Labrum bordered with black but with no transverse black stripe 
Occiput bordered with black; 10 black below..... adelphus, p. 94 
Occiput not bordered with black; 10 yellow below. . . vastus, p. 95 
Stripes one and two conjoined above collar; carina black 
EM MRE PONS peat 8 pF tres 12 Yea ee a eset Re 8 scudderi, p. 95 
Stripes one and two separate above collar; carina more or less pale 
ida ais el -canetns ges tksey = toe UN ate ee 14. 
Side (anterior face) of hind femora yellow....... amnicola, p. 95 
Side of hind femora: black 302.0252. s.g6.'. bien e oes consanguis, p. 94 
Stripes of pair one short and more or less indistinct (Arigomphus) 
Se eee ee ed ot SE eae Gone eee ee 16. 
Stripes of pair one longer and better defined................ 23 
Occiput bordered* with black; :50025: 22. ase oe villosipes, p. 116 
Occiput. not bordered!with blacked) (325-6 ae eee es one ily: 
