484 NEW YORK STATE MUSEUM 



The few nymphs I have found were all obtained from clayey banks 



among wave- washed roots of trees, in places most difficult to use a 



net. 



Macromia taeniolata Rambur 



1842 Macromia taeniolata Eambnr, Ins. Neur. p. 139 

 1861 Macromia taeniolata Hagen, Synopsis Neur. N. Am. p. 132 

 1874 Macromia taeniolata Hagen, Bost. soc. nat. List. Proc. 16 : 359 

 1893 Macromia taeniolata Calvert, Am. ent. soc. Trans. 20 : 250 (de- 

 scription) 



1899 Macromia taeniolata Kellicott, Odou. Ohio, p. 86 (description) 



1900 Macromia taeniolata Williamson, Dragon Hies Ind. p. 309 (de- 



scription) 

 1890 Macromia taeniolata (nymph, supposition) Cabot, Immature state 

 Odon. Pt 3, p. 9, pi. 2, fig. 4. 



Distributed from Pennsylvania to Florida and Illinois. 



KEY TO NORTH AMERICAN GENERA OF CORDULINAE (s. sir.) 



Imagos 



a Veins M4 and Cui in the fore wing parallel or a little divergent apically, the 

 number of rows of cells between them increasing toward the margin of the 



wingi Neurocordulia 



aa Veins M4 and Cui in thefore wing approximated toward the margin of the wing 

 h The second cubito-anal cross vein (and therefore, the subtriangle) normally 

 present in the hind wing (absent occasionally in Helocordulia) 



c Triangle of hind wing divided by a cross vein Epicordulia 



cc Triangle of hind wing without cross vein, open 



d Anal loop symmetrically truncated at its distal end, with but three 

 cells at the end ; stigma very narrow and sharp-pointed at its ends 



Helocordulia 

 dd Anal loop unsymmetrically truncated at its distal end, with more than 

 three cells at the end ; stigma wider and less sharply pointed 



Som at ochlora 

 hb The second cubito-anal cross vein absent in the hind wing 



c Triangle of the fore wing traversed by a cross vein, with two complete 

 rows of cells in the space beyond it 

 d Wings with black basal markings; inferior appendage of the male, nob 

 bifurcated ..^ Tetragoneuria 



1 One species, the little Cordulia lintneri of Hagen, may seem to belong in this section of 

 the table, though, of course, not in the genus Neurocordulia; it is also a synthetic type, lack- 

 ing the special corduline features of venation, which I take to be 1) the approximation of veins 

 M^ and Cu j , and 2) the general reduction of cross veins; it shows strong libelluline aflSnities in 

 the conformation of the anal loop and in the possession of a half-antenodal cross vein just before 

 the nodus. We may expect that its nymph when discovered will throw light on its true relation- 

 ships. I leave it here in the genus Dor ocordulia beside the two species with which it has 

 hitherto been associated. 



