120 



Smith and Pritchard: Odonata 



Naiads 





Fig. 4:26. Gomphus intricatus. a, second abdominal segment 

 of male; b, lateral view of male abdominal appendages; c, ventral 

 view of female abdominal segments 9-10; d, dorsal view of male 

 abdominal appendages; e, female occiput; f, ventral view of 

 terminal segments of male abdomen; g-i, color pattern on male 

 legs (Kennedy, 1917). 



— Stigma surmounting 2 or more cross veins not counting 

 brace vein; supratriangle with cross veins 5 



5. Base of wings with large brown spot; 1 row of cells 

 between Cu, and Cu 2 Basiaeschna Selys 



— Base of wings hyaline; 2 rows of cells between Cu, 

 and Cu 2 Oplonaeschna Selys 



6. Radial sector with fork symmetrical, and with not more 

 than 2 rows of cells between it and its planate 7 



— Radial sector with fork unsymmetrical, and with 3 or 

 more rows of cells between it and its planate (fig. 4:33) 



8 



7. Frons strongly projecting, the dorsal margin acute; 

 radial planate subtending 1 row of cells 



Nasiaeschna Selys 



— Frons not projecting; radial planate subtending 2 rows 

 of cells Epiaeschna Hagen 



8. Radial sector forked under the stigma 



Coryphaeschna Williamson 



— Radial sector forked proximad to the stigma 9 



9. Supratriangle no longer than midbasal space (fig. 4:29) 



Aeshna Fabricius 



— Supratriangle distinctly longer than midbasal space . 10 

 10. Hind wing with 2 rows of cells between M, and M 2 



beginning distad to base of stigma; female with trifid 



process on venter of 10th abdominal segment (fig. 4:34) 



Triacanthagyna Selys 



— Hind wing with 2 rows of cells between M t and M 2 

 beginning at base or proximal to base of stigma; female 

 with bifid process on venter of 10th abdominal segment 

 (fig. 4:33) Gynacantha Rambur 



1. Lateral lobes of labium with stout raptorial setae . . 2 



— Lateral lobes of labium lacking raptorial setae (fig. 

 . 4:llo-p) 3 



2. Lateral setae of labium nearly uniform in length .... 



Triacanthagyna Selys 



— Lateral setae of labium very unequal in length, dimin- 

 ishing to very small ones at proximal end of row . . . 



Gynacantha Rambur 



3. Distal border of mentum with a pair of sharp, parallel 

 spines, 1 on each side of the mental cleft; head flat- 

 tened and elongate-rectangular seen from above (fig. 

 4:llo) Coryphaeschna Williamson 



— Distal border of mentum not so armed (fig. 4: lip) ... 4 



4. Lateral spines present on abdominal segments 7-9 . . 



— Lateral spines present on abdominal segments 4, 5, or 

 6-9 7 



5. Superior anal appendage but slightly shorter than 

 inferior 6 



— Superior anal appendage about three-fourths inferiors; 

 inferiors about subequal in length to middorsum of 

 segments 9 and 10; male appendage triangular with a 

 blunt, rounded apex Aeshna Fabricius 



6. Inferior anal appendage about one and one-half times 

 as long as middorsal length of segment 9 and 10; 

 superior anal appendage cleft at apex Anax Leach 



— Inferior anal appendage less than middorsal length of 

 segment 9 and 10; superior anal appendage bluntly 

 rounded at apex Gomphaeschna Selys 



b3 



Fig. 4:27. Naiad characters in the genus 

 olivaceous; b, G. infricatus; c, G. confrafernu 

 confraternus confraiemus; 1, mentum, 2, detail 

 3, terminal abdominal segments. (Kennedy, 1917). 



Gomphus. a, G, 



s a'onneri; d, G. 



of mental lobe; 



