228 NEW YORK STATH 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. 
Fig. 5 Hetaerina: male abdominal appendages; a, H. americana; b, H. tricolor 
Hetaerina tricolor Burmeister 
18389 Calopteryx tricolor Burmeister, Handb. Ent. 2:827 
1854 Hetaerina tricolor Selys, Monogr. Calopteryginae, p.136, 
pl.12, fig.5 
1861 Hetaerina tricolor Hagen, Synopsis Neur. N. Am. p-61 
1875 Hetaerina tricolor Hagen, Bost. Soc. Nat. Hist. Proc. 18:24 
1898 Hetaerina tricolor Calvert, Am. Ent. Soc. Trans. 20:229 
1899 Hetaerina tricolor Kellicott, Odon. Ohio, p.13 
1900 Hetaerina tricolor Williamson, Dragon Flies Ind. p.255 
1901 Hetaerina tricolor Howard, Insect Book, pl.46, fig.19 
This handsome dark colored species is not as yet known from 
New York. Its nymph is unknown. 
Subfamily LESTINAB 
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- 
