AQUATIC INSECTS IN THE ADIRONDACKS 43I 



all the recorded localities of occurrence within the state. The list in- 

 cludes 102 nominal species. In the suborder Anisoptera belong 67 of 

 these, to which I am able to add 15 species and varieties not hitherto 

 recorded. These are : Ophiogomphus aspersus Morse, 

 O. johannus Ndm. (O. c a r o 1 u s Ndm. has been previously listed as 

 O. mainensis Pack.) Gomphus abbreviatus Hag., Gom- 

 phus scudderi Sel., G. quadricolor Walsh^ G. furcifer 

 Hag., G. sordidus Hag., G. descriptus borealis n. var., 

 C ord u legas ter ma c u la tus Sel,, Tetragoneuria spinosa 

 Hag., Cor dull a shurtleffi Scudd., Ladona julia Uhl. 

 and Leucorhinia glacialis Hag. I am able also to describe 

 the nymphs of all the genera herein characterized, except two : 

 G o m p h a e s c h n a, and Micrathyria, and in many of them, 

 to describe the nymphs of a number of species. 



Immature stages in this order are still very little known. Of the 80 

 species herein discussed, I find that the nymphs of 20 have been more or 

 less completely described and referred to their proper species; 18 of 

 these have been described by Hagen and Cabot, and most of them, well 

 figured; the nymph of one of our species which occurs also in Europe, 

 Libellula quadrimaculata Linn., has long been known in 

 the old world ; and recently E. B. Williamson has been able to get for 

 description the nymph ofTachopteryx thoreyi Selys, our sole 

 representative of the Petalurinae and thus to fill one of the most im- 

 portant gaps in our knowledge of the immature stages. Most of these 

 are briefly redescribed below, and 42 new descriptions are added. 

 Thus the early stages are more or less known for 62 of our 80 species. 



With three exceptions I have given herein no descriptions of imagos; 

 The descriptive catalogues of Calvert, KeUicott, and WilHamson, and 

 other available special papers contain descriptions which it is hardly 

 profitable here to duplicate. In absence of these I trust the keys and 

 tables herein given may be sufficient for the determination of the species. 



In the bibliographies given below, completeness has not been aimed 

 at : the student who desires complete bibliography should consult the 

 three following bibliographic catalogues. 



Hagen, H. A. Synopsis of the Odonata of America. Bost. soc. nat. hist. 

 Proc. 1875. 18 : 20-96. 



Banks, Nathan. Synopsis, catalogue and bibliography of the neuropteroid 

 insects of temperate North America. Am. ent. soc. Trans. 1892. 19 : 327-73 



Kirby, W. F. Synonymic catalogue of Neuroptera Odouata, or dragon flies. 

 Lond. 1890. 



