112 



Smith and Pritchard: Odonata 



i k 



Fig. 4:13. Ani sopterous naiads, caudal segments of abdomen, all dorsal views except g, 

 (lateral), o, Macrom;a; b, Didymops; c,d, Neurocordulia; e, Cannacria; f, Sympetrum; g, Erythemis; 

 h, Perithemis; i, Pachydiplax; j, Tramea; k, Pantala (Wright and Peterson, 1944). 



occur in the muck of seepage waters and in spring thorax black, spotted with yellow 



\) as. Tanypteryx Kennedy 



Key to Nearctic Genera Naiads 



Adults 1. Antenna with 7 segments (fig. 4:116); no extra hooks 



present Tachopteryx Selys 



1. Hind wing with triangle having a cross vein; thorax Antenna with 6 segments; lateral lobe of labium with 



grayish, striped with black Tachopteryx Selys minute extra hook on upper rim of base of movable hook 



Hind wing with triangle lacking a cross vein (fig. 4:15); Tanypteryx Kennedy 



