AQUATIC INSECTS IN NEW YORK STATB 267 
Gomphus furcifer 
Mr T. H. Hankinson took a specimen of this species on the 
Renwick flats at Ithaca in July 1901, thus establishing the fact 
that the species belongs to the Ithaca fauna. 
Gomphus notatus 
This species and G. plagiatus are very closely related. 
Both are likely to be found in the State eventually. I have 
recently had bred specimens of notatus for study from the 
United States National Museum, and from Mr E. B. Williamson, 
the former from Detroit Mich. and the latter from Nashville 
Tenn. The differences between the nymphs of the two species 
are so slight that they will be appreciated with difficulty by a 
novice. They are as follows: (1) In notatus the ninth 
abdominal segment is more than five times as long as the tenth 
segment; in plagiatus, less than five timesaslong. (2) The 
two to three obliquely truncated teeth on the inner margin of the 
lateral lobe of the labium are twice as bigin notatus asin 
plagiatus [see Bul. 47, pl.20, fig.16]. (8) The rudiment-of a 
dorsal hook on the apex of the ninth abdominal segment is a 
little better defined in notatus. 
Gomphus spiniceps 
A nymph of this species was taken from Forest lake, Ithaca, 
by Mr O. A. Johannsen, in July 1902, and reared. 
Gomphus descriptus 
Corrections. In Bulletin 47, page 454, there are stated to be six 
to eight teeth on the inner margin of the lateral lobe of the 
labium of the nymph of this species; the number should be eight 
to ten as given in the key on page 446. 
On page 436 the word “tarsi” in line aa in the key at the 
bottom of the page should read “ femora.” 
CORDULEGASTERINAE 
Cordulegaster sayi 
I have received nymphs from Mr C. 8S. Brimley of Raleigh 
N. C. that should belong to this species, because of their locality 
and their very close resemblance to those of C.diastatops. 
