AQUAT'C INSECTS IN NEW YORK STATE 257 
Enallagma antennatum Say 
Plate 16, fig. 4; plate 19, l 
1839 Agrion antennatum Say, Acad. Nat. Sci. Phila. Jour. 8:39 
1861 Protoneura antennata Hagen, Synopsis Neur. N. Am. p.73 
1895 HEnallagma fischeri Kellicott, Cincinnati Soc. Nat. Hist. 
Jour, 17:206 
pest Pnallagma fischeri Calvert, N. Y. Ent: Soc. Jour. 5:94 
(listed from Ithaca) 
1900 Enallagma antennatum Williamson, Dragon Flies Ind. 
p.274, pl.d, fig.19, 20 
In April Mr E. B. Williamson sent me from Bluffton Ind., 
and Mr R. J. Weith sent me from Elkhart Ind., simultaneously, 
nymphs (one of which is shown on plate 16, figure 4) that I 
Suspected might belong to this species. Mr Williamson had 
volunteered to rear the species for me, and early in June he 
reported that he had done so, and that it was E. anten- 
natum. The nymph differs from others of the genus in the 
striking zigzag lines of pigmentation across the eyes, in a 
poorer development of the mental setae of the labium and in 
the shape and color pattern of the gills. 
Nymph [pl.16, fig.4]. Measures (not fully grown) in length 
12mm, gills 5mm additional. Colors green and brown, disk of 
head and a middorsal longitudinal line on prothorax, narrowing 
posteriorly, pale; there is also an oblique pale line starting be- 
hind each eye on the sides of the prothorax. The pigmentation 
of the eye is in well marked zigzag lines extending horizontally. 
Legs pale, with subapical rings of brown on all femora. There 
is a narrow pale middorsal line on the abdomen and a paler 
wash on the lateral angles of all the segments. The antennae 
are but six jointed but I suspect that this may be due to imma- 
turity; the two basal segments are brown, the remainder, pale. 
Gills lanceolate, unusually long and narrow, widest just 
beyond the middle, obscurely marked with brown, which is 
deepest in shade just before the white tips. 
Labium with five lateral setae, and three mentals each side, 
of which one is minute: thus the development of mental setae 
is less than in any other species at present known to me. 
I have collected a single male specimen at Ithaca. 
Enallagma traviatum Selys 
Plate 19, k 
1876 Hnallagma traviatum Selys, Acad. Belg. Bul. (2) 41:519 
1895 Enallagma traviatum Calvert, N. Y. Ent. Soc. Jour. 3:44 
(listed from Long Island) 
