AQUATIC INSECTS IN THE ADIRONDACKS 467 



marks on the lateral margins of the abdominal segments at base ; a broad 

 middorsal pale band on abdomen, motded with brown, and including 

 two blackish spots on the eighth segment; appendages, spines, tarsal seg- 

 ments and claws, yellow, blacktipped. 



Head with very prominent, anteriorly directed eyes, narrowed behind 

 the eyes to very sharp hind angles ; between these angles the rear of the 

 head is slightly concave; the labium has its median lobe prominent, 

 fringed, distinctly cleft; the lateral lobe, rather small, tapering to its 

 incurved apex, rather regularly. 



Abdomen without dorsal hooks, with lateral spines on segments 3 or 

 4-9, increasing in size posteriorly, those of the ninth segment about equal- 

 ing in length the loth segment; inferior appendages long and very sharp, 

 distinctly longer than the last two abdominal segments; superior one half 

 to three fifths as long as the inferiors, its apex with a round notch ; later- 

 als about half as long as the superior. 



The unusual brevity of the superior appendage is about as distinctive 

 as the shape of the lateral labial lobe, indicated in the above table. 



NASIAESCHNA^ 



There is a single species. 



Nasiaeschna pentacantha Rambur 



1842 Aeschna pentacantha Rambur, Ins. Neur. p. 208 



1861 Aeschna pentacantha Hagen, Synopsis Neur. N. Am. p. 129 (de- 



scription) 



1862 Aeschna pentacantlia Walsh, Acad. nat. sci. Phil. p. 397 (notes) 

 1875 Aeschna pentacantlia Hagen, Bost. soc. nat. hist. Proc. 18 : 37 



(bibliography and distribution) 



1888 Epiaeschna beros (nympb) Garman, 111. state lab. nat. hist. Bui. 3 : 178 

 (descriptive notes) 



1895 Aeschna pentacantha Banks, Ent. news, 6:124 (recorded from 

 Baldwinsville) 



1897 Aeschna pentacantha Calvert, N. Y. ent. soc. Jour. 5:95 (recorded 

 from Baldwinsville) 



1900 Aeschna pentacantha Williamson, Dragon flies Ind. p. 305 (descrip- 

 tion) 



This species ranges from Massachusetts to Texas, and from Illinois to 

 Georgia : it is apparently rare throughout its range. Probably not more 

 than a dozen specimens of the adult insect exist in collections. 



As to the nymph, Garman first found it in the Mississippi bottoms near 

 Quincy 111. His types were lent me for study several years ago by 

 Prof. Forbes. I was able to refer them by exclusion to this species. Mr 

 Hart of the IlHnois state laboratory, has since written me that he has suc- 

 cessfully reared similar nymphs obtained by him in a creek near Cham- 

 paign 111. Thus their identity is settled. I have since obtained well 



1 de Selys 1900: diagnosis in French, included in a paper " Odonaten aus Neu-Guinea" by F. 

 Fijrster, in Termeszetrajzi Fiizetek, v. 23 (Budapest). 



