No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 219 



6. Inferior anal appendage broader at tip than at base and triangular ; 



basal tooth of the superiors visible from above (Fig. 62) . .cingulata 

 Inferior anal appendage not broader at tip than at base ; basal 

 tooth of the superiors not visible from above (Fig. 60) . . .albicincta 



7. Superiors each with a prominent lateral angle in dorsal view (Fig. 



42, Nos. 7 and 8) (provocans) 



Superiors without a prominent lateral angle in dorsal view 8 



8. Superior anal appendages in lateral profile curving upwards at 



tip, and not decidedly f orcipate when viewed from above 9 



Superior anal appendages in lateral profile not curving upwards 

 at tip, in dorsal profile decidedly f orcipate 11 



9. Inferior anal appendage three-fourths as long as the superiors, 



Fig. 46 minor 



Inferior anal appendage hardly more than half as long as the 

 superiors, Fig. 44 lO 



10. Superiors parallel distally, with a sub-basal ventro-internal tooth 



elongata 

 Superiors approximated distally without a sub-basal ventro-internal 

 tooth, Fig. 49 williamsoni 



11. Abdominal segments S to 7 with yellow latero-basal spots, greatest 



width of abdomen at distal end of segment 5, thence narrowing 



caudad 12 



Abdominal segments 5 to 7 without yellow basal spots ; greatest 

 width of abdomen at caudal margin of segment 6 or beyond .... 13 



12. Superior anal appendages in profile nearly straight (incurvata) 



Superior appendages, in profile, arcuate with a very prominent 



ventro-lateral tooth (Fig. 55) forcipata 



13. Hind wing a trifle shorter than the abdomen (30:33); anal tri- 



angle more or less yellow (Fig. 58) kennedsri 



Hind wing much shorter than the abdomen (26:38); anal tri- 

 angle with a brown spot (Fig. 57) (franklini) 



Females^ 



1. Vulvar lamina notched apically, or bilobed 2 



Vulvar lamina entire at apex 3 



2. Vulvar lamina nearly half as long as sternum of 9; deeply emar- 



ginate or bilobed albicincta 



Vulvar lamina one-third as long as sternum of 9; obtusely exca- 

 vated but scarcely bilobed cingulata 



3. Vulvar lamina viewed from the side at least four times as long as 



its basal breadth ; usually extending well beyond tlie caudal 



margin of segment 10 4 



Vulvar lamina less than 4 times as long as its basal breadth and 

 not extending beyond the caudal margin of segment 10 in lateral 

 profile 5 



4. Vulvar lamina longer than the appendages (provocans) 



Vulvar lamina shorter than the appendages (filosa) 



5. Vulvar lamina erect or suberect, extending ventrad a distance equal 



to the height of segment 9 in lateral profile, the hind margin 

 nearly at right angles to the ventral margin of that segment ... 6 

 Vulvar lamina inclined, not erect or suberect, and not extending 

 ventrad a distance equal to the height of segment 9 in lateral 

 profile and the hind margin not at right angles to the ventral 

 margin of that segment 10 



6. Labrum at least partly yellow, postclypeus wholly yellow 7 



Labrum wholly black, postclypeus or its median part black 8 



-•This key has been adapted to Connecticut species from Walker, 1925. Species in 

 parentheses are not described in the text. 



