456 NEW YORK STATE MUSEUM 



places piled several layers deep with the exuviae of this species, inter- 

 mixed with a lesser number ofG. spicatus skins. 



Nymph. Total length 26 mm; abdomen 18 mm; hind femur 5.5 

 mm ; width of head 5 mm, of abdomen 6 mm. 



Abdomen depressed, lanceolate, regularly narrowed beyond the sixth 

 segment to a rather pointed apex; the loth segment two thirds as long 

 as the eighth, a little less than half as long as the ninth ; lateral spines on 

 segments 6-9, very minute, specially on segment 6, increasing in size 

 posteriorly, on segment 9 one half as long as segment 10 : dorsal hooks 

 low and obscure, but pointed on sixth to ninth segments. 



Labium with its median lobe a very little convex on the front margin, 

 and sometimes with an imperfect median tooth ; lateral lobe considera- 

 bly arcuate, with a strong end hook, and with 4-7 very variable teeth on 

 its inner margin, each tooth obliquely truncate, with the longer angle 

 directed to the rear. 



This species and G. sordidus, offer an easy transition to the 

 Arigomphus group, below. 



Gomphus ventricosus Walsh 



1863 Gomphus ventricosus Walsh, Ent. soe. Phil. Proc. 2 : 249 



1875 Gomphus ventricosus Hagen, Bost. soc. nat. hist. Proc. 18:47 



(listed) 

 1900 Gomphus ventricosus Williamson, Dragon flies Ind. p. 287 (de- 

 scription and figure) 



This apparently rare species has not yet been taken in New York. I 

 include it in this Hst because of its occurrence in Illinois and Massachu- 

 setts; it will doubtless yet be found within the state. Its nymph is 

 unknown. 



Gomphus amnicola Walsh 



1862 Gomphus amnicola Walsh, Acad. nat. scl. Phil. Proc. p. 396 



1863 Gomphus amnicola Walsh, Ent. soe. Phil. Proc. 2 : 256 (note) 



1897 Gomphus amnicola Calvert, N. Y. ent. soc. Jour. 5 : 95 (listed from 



Bethlehem N. Y.) 

 1900 Gomphus amnicola Williamson, D^-agon flies Ind. p. 294 (descrip- 

 tion and figure) 



Another species which is apparently rare, once collected within the 

 state by Dr Lintner at Bethlehem. The nymph is unknown. 



Gomplius scudderi Selys 



1878 Gomphus scudderi Selys, Acad. Belg. (2) Bui. 46 : 460 $ 



1898 Gomphus scudderi Harvey, Ent. news, 9:62-63 ^ (description 



and figures) 

 This handsome black species (pi. 17, fig. 2), unique in the yellow 

 basal rings on its abdominal segments, has not been reported hitherto 



