AQUATIC IXSBOTS IN NEW YORK STATE 257 



Enallagma antennatum Say 



Plate 16, fig. 4; plate 19, I 



1839 Agrion antennatum Say, Acad. Nat. Sci. Phila. Jour. 8:39 



1861 Protoneura antennata Hagen, Synopsis Neur. N. Am. p.73: 



1895 Enallagma fischeri Kellicott, Cincinnati Soc. Nat Hist- 



Jour. 17:206 

 1897 Enallagma fischeri Calvert N. Y. Ent Soc. Jour. 5:94 



(listed from Ithaca) 

 1900 Enallagma antennatum Williamson, Dragon Flies Ind. 



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



In April Mr E. B. Williamson sent me from Bluffton 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 [pl.l6, 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 sdx jointed but I suspect that this may be due to imma- 

 turity; the two basal segments are brown, the remainder, pale. 



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

 1895 Enallagma traviatum Calvert, N. Y. Ent. Soc. Jour. 3:4it 

 (listed from Long Island) 



