AQUAT'C INSECTS IX NEW YORK STATE 25T 



Enallagma aiitennatum Say 



Plate 16, fig. 4; plate 19, I 



1839 A g r 1 o n a n t e n n a t n m Say. Acad. Nat. Sci. Phila. .Tour. 8:39 



18G1 P r o t o n e u r a a u t e ii u a t a Hagen, Sj-nopsis Neur. N. Am. p.73- 



1895 Euallagma f i s c ii e r i Kellicott, Ciuciiinati Soe. Nat. Hist^ 



Jour. 17:206 

 1897 En all agm a f i s c b e r i Calvert, N. Y. Ent. Soc. Jour. 5:94 



(listed from Ithaca) 

 1900 Enallagma antennatum Williamson, Dragon Flies lud. 



p.274, pl.5, flg.l9, 20 



In April Mr E. B. Williamson sent me from Blnffton Ind., 

 and Mr E. 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 [pi. 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 alt femora. There 

 is a narrow pale middorsal line on the abdomen and a paler 

 wash oh 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, ic 

 1876 Enallagma traviatum Selys, Acad. Belg. Bui. (2) 41:519 

 1895 Enallagma traviatum Calvert, N. Y. Ent. Soc. Jour. 3:44 

 (listed from Long Island) 



