182 DRAGONFLIES OF NORTH AMERICA 
The genus includes only two species of the eastern United States. 
The nymphs are stocky little fellows with a concentration of sharp 
dorsal hooks toward the blunt apex of the abdomen, the hooks being 
longest on segments 7 and 8 and absent from segments 1 to 4. The 
differences between the two species may be expressed as follows. 


SALE y 
rep ES SEE 






& 
THOR OXPOD ROALD 
COO SEH 
Fig. 36. Wings of Helocordulia selyst. 

Nymphs 
Species Length Dorsal Lateral Lateral Described by 
hooks setae spine of 8 
selysii 20 7-9 if =i sp. of 9 | Kndy ’24, p. 12 
uhleri 20 6-9 6 = sp. of 9 | Ndm. ’01, p. 498 

KEY TO THE SPECIES 
Adults 
1 With a golden fleck in the midst of the brown at base of hind wings 
FN the oh te saliod take a Se eA EO Te ae Ree uhleri, p. 182 
e 
No golden fleck only brown at base of hind wings . . .selysi, p. 183 
143. Helocordulia uhleri Selys 
Selys ’71, p. 274: Mtk. Cat. p. 124: Howe ’19, p. 56: Garm. ’27, p. 208. 
Length 38 mm. Expanse 54 mm. Me., Ont., Pa., N. J. 
A pretty bog-loving species with daintily spotted wings. Face, vertex and 
occiput pale. Thorax brownish olivaceous, hoary, appearing somewhat blackish 
