228 



NEW YORK STATE MUSEUM 



above the end hook on the distal margin are two other strong 

 hooks, the one next the end hook being twice the size of the 

 other above it. 



■ Prothorax with a pair of elevated, round tipped prominences 

 each side of the dorsum. Legs thin, smooth, long. Wing cases 

 reaching as far as the base of segment 5 of the abdomen. 



Abdomen smooth, cylindric, with lateral margins becoming 

 sharp posteriorly and generally ending on segments 7-9 in a 

 sharp, flat, lateral spine. Gills variable in size, and easily broken 

 off; the median one flat, the two lateral ones triquetral, all with 

 thin margins, and apexes rather obtuse. 



a b 



Fig. 5 Hetaerina: male abdominal appendages; a, H. americana; b, H. tricolor 



Hetaerina tricolor Burmeister t 



1839 Calopteryx tricolor Burmeister, Handb. Eut. 2:827 



1854 Hetaerina tricolor Selys, Monogr. Calopteryginae, p.l36, 



pl.l2, fig.5 

 1861 Hetaerina tricolor Hagen, Synopsis Neur. N. Am. p.61 

 1875 Hetaerina tricolor Hagen. Bost. Soc. Nat. Hist. Proc. 18:24 

 1893 Hetaerina tricolor Calvert. Ani. Ent. Soc. Trans. 20:229 



1899 Hetaerina tricolor Kellicott, Odon. Ohio, p. 13 



1900 Hetaerina tricolor Williamson, Di-agon Flies Ind. p.255 



1901 Hetaerina tricolor Howard, Insect Book, pl.46, fig.l9 



This handsome dark colored species is not as yet known from 

 New York. Its nymph is unknown. 



Subfamily lesxinae 

 A single genus is included within our fauna. 



LESTES 



This large and cosmopolitan genus is represented among us 

 by a number of interesting and beautiful species. They are 

 abundant in marshes, in shallow pools filled with standing 

 aquatics and about the reedy borders of streams and ponds. 

 They are rarely seen either over open water, or at any consider- 



