5l8 NEW YORK STATE MUSEUM 



Leucorhinia p:lacialis Hagen 



Plate 10. 



1890 Leuc orhini a glacial is Hagen, Am. ent. soc. Trans. 17:234, pi 

 10, fig. 3 and 14 



This species has been known hitherto from a few male specimens col- 

 lected at Cape Breton, N. S., London, Ont.; Michipicoten on Lake 

 Superior; Reno, Nev. ; and in the White mountains of New Hampshire. 

 It has not been recorded from New York state, but I found it common at 

 Saranac Inn. During the first week or two of adult life, before age and 

 pruinosity have obscured its remarkably fine coloration, it is a singularly 

 beautiful insect. One who sees only preserved specimens would not sus- 

 pect this however, for in such, faded browns have replaced the ruby red 

 color of the males and the brilliant yellow of the females. I well remember 

 with what delighted surprise I greeted my first specimen. It was a 

 young male, with a brilliant red body phalerate with jet black, a flaves- 

 cent tinge beyond the basal markings of the wings, a rich red-brown 

 stigma, with a touch of yellow on the costa either side of it, and a face 

 with the whiteness and subopaqueness of fine china. That specimen 

 was captured beside the Inn road in the last week of June ; soon after, 

 ward I found plenty of them — females as well — about the bog pond that 

 lies near this road south of the station ; they were flying with C o r d u 1 i a 

 shurtleffi, Dorocordulia libera, and L e s t e s eurina 

 — a group of rare beauties. 



Early in July I found them commonly about the outlet of Little Clear 

 pond, and there obtained nymphs (which later were reared), saw the 

 females ovipositing and obtained the eggs. 



Female imago (hitherto undescribed; pi. lo, fig. 3). Length 34 

 mm ; abdomen 23 mm; hind wing 25 mm. 



Similar to the male, with only the middle half of the labium black, 

 the sides white (I have a small male that is so, also); face opaque 

 white. Thorax and basal segments of the abdomen brilliant yellow in 

 life, phalerate with black ; the middorsal thoracic stripe of black con- 

 stricted above, dilated below; a short, not very distinct, isolated humeral 

 stripe of black; complete stripes that are broad and irregular on^the 

 humeral and third lateral sutures, and an oblique lateral stripe crossing 

 the midlateral suture and joining the humeral stripe; a black mark on 

 the mesothoracic spiracle; dorsal and lateral yellow areas almost envel- 

 oping the basal abdominal segments, but isolated on the first and second 

 segments, fused on the third, which is all yellow except an apical ring 

 and a mark at each side below; there is a yellow dorsal mark on the 

 fourth segment, and there are dorsal yellow triangles on segments 

 5-7 ; there is also a lateral yellow basal triangle on each side of the 

 fourth segment. The wings have the basal marking and the yellow 



