AQUATIC INSECTS IN THE ADIRONDACKS 45I 



Gomphus fraternus Say 



1839 Aesclma fraterna Say, Acad, cat. sci. Phil. Jour. 8: 16 



1861 Gomphus fraternus Hagen, Synopsis Neur. N. Am. p. 104 



1862 Gomphus fraternus Walsh, Acad. nat. sci. Phil. Proc. j). 393 



1863 Gomphus fraternus Walsh, Ent. soc. Phil. Proc. 2 : 238 



1890 Aeshna fraterna Kirby, Cat. Neur. Odon. p. 66 (bibliography) 

 1892 Gomphus fraternus Banks, Am. ent. soc. Trans. 19:352 (listed) 



1894 Gomphus fraternus Banks, Can. ent. 26 : 77 (listed from Ithaca) 



1895 Gomphus fraternus Calvert, N. Y. ent. soc. Jour. 3:45 (listed from 



Ithaca) 

 1897 Gomphus fraternus Van Duzee, N. Y. ent. soc. Jour. 5 : 89 (listed 



from Niagara) 

 1897 Gomphus fraternus Calvert, N. Y. ent. soc. Jour, 5:93 (listed) 



1899 Gomphus fraternus Kellicott, Odon. Ohio, p. 59 (description and 



figures) 



1900 Gomphus fraternus Williamson, Dragon flies Ind. p. 289 (descrip- 



tion and figures) 

 1897.Gomphus fraternus Needham, (nymph) Can. ent. 29, pi. 7, fig. 11 

 and 12 (figures only; those are reproduced in plate 20 of this bulletin) 



This vigorous species seems to prefer the larger bodies of water.. The 

 imago is a very strong flyer. It skirts the edge of streams with dashing 

 sweeps which seem to proclaim it master of the situation. I have several 

 times seen it feeding on other dragon flies as large as Mesothemis 

 simplicicollis. The nymph is an active burrower in the bare clay 

 bottoms of streams and lakes under water of considerable depth. I 

 repeat herewith the figures of the nymph (cited above) and add a brief 

 description. 



Nymph. Length 31 mm; abdomen 20; hind femur 6.5 ; width of 

 head 5, of abdomen 9; colors obscured ; margins all hairy; tibial bur- 

 rowing hooks very strong, as long as tibia is wide. Third segment of 

 antenna twice as long as the first and second together, hairy on margms; 

 fourth a minute ovoid rudiment. 



Mentum of labrum (pi. 20, fig. 12) squarish before the contracted basal 

 fourth; median lobe very slightly convex, densely frmged; lateral lobe 

 bluntly angular at the apex with 7-1 1 small teeth on inner margin. 



Abdomen (pi. 20, fig. 11) broad, depressed, with sides parallel most of 

 its length, abruptly narrowed beyond the sixth segment, minute dorsal 

 hooks on segments 8 and 9; median groove on anterior segments, well 

 developed lateral spines on segments 6-9 those of 9 about equaling the 

 appendages. 



Gomphus adelphus Selys 



1857 Gomphus adelphus Selys, Monographie des gomphines, p. 413 

 1861 Gomphus adelphus Hagen, Synoi>sis Neur. N. Am. p. 104 



1896 Aeshna adelpha Kirby, Cat. Neur. Odon. p. 67 (bibliography) 

 1892 Gomphus adelphus Banks, Am. ent. soc. Trans. 19 : 351 (listed) 



