AQUATIC INSECTS IN THE ADIRONDACKS 517 



Leucorhinia intacta Hagen 



White face 



1861 Diplax intacta Hagen, Synopsis Neur. N. Am. p. 179 



1890 Leucorli in i a in t act a Calvert, Am. ent. soc. Trans. 18:39, pi. 5, 



fig. 1, 7-9 

 1890 Leucorhinia intacta Hagen, Am. ent. soc. Trans. 17:235, pi. 10, fig. 



6, 8, 15, 16 and 23 

 1893 Leucorhinia intacta Calvert, Am. ent. soc. Trans. 20:262 

 1895-97 Leucorhinia intacta Calvert, N. Y. ent. soc. Jour. 3:48 and 5:94 

 (listed from Center, Keeseville, Ithaca, Westchester co., Croton on Hud- 

 son, Niagara river, etc.) 



1899 Leucorhinia intacta Kellicott, Odon. Ohio, p. 106 (description) 



1900 Leuco rhinia i ntac t a Williamson, Dragon flies Ind. p. 321 (descrip- 



tion) 

 This species was not observed at Saranac Inn, but it is very common 

 at Ithaca in the marshy flats below the city, at the head of Cayuga lake 

 and in the shallow ponds between McLean and Freeville N. Y., where 

 I have collected the nymphs in great numbers. I have observed the 

 female imagos ovipositing in two quite different ways: descending and 

 striking the water with the tip of the abdomen while in flight after the 

 manner most common among Libelluhdae, and at rest on some vertical 

 stem at the surface of the water, plying with the tip of the abdomen just 

 below the surface. In both cases the female was unattended by the male. 



Nymph. Total length 17.5 mm; abdomen 10 mm; hind femur 5 

 mm; width of head 5 mm, of abdomen 6.5 mm. 



In coloration the body shows generally very distinctly the following 

 marks, besides others less distinct and constant. There is the usual black 

 band across the head including the eyes, and the usual rings of brown are 

 on the legs, and obhque stripes on the sides of the thorax; there is a 

 pair of black bands emerging from beneath the tips of the wing cases, 

 and extending to the sides of the loth abdominal segment; there is 

 a submedian, double row of round dots on the ventral side, running the 

 length of the abdomen ; and between these and the lateral margins of 

 the abdomen there are two blackish, interrupted bands, one on each side. 



The labium is ample, and has 10 lateral setae, and about 13 mental 

 setae, of which the sixth (counting from the side) is longest; the teeth 

 are obsolescent, but still distinctly crenate in form, and armed with sev- 

 eral spinules each; the abdomen is widest across the sixth segment, 

 narrowing slowly to the eighth segment, and then suddenly narrowed at 

 the ninth; the lateral spines of the eighth segment surpass the middle 

 of the ninth segment on its dorsal side; those of the ninth segment about 

 attain the level of the tip of the superior appendage; the lateral append- 

 ages are half as long as the inferiors, and these exceed the superior a 

 little; dorsal hook of the third segment very minute, erect; that of the 

 fourth segment erect also but larger, the remaining hooks of more nearly 

 equal size, laterally flattened, and above their bases strongly bent pos- 

 teriorly, the tip of the hook of the eighch segment being scarcely more 

 declined than the tip of the hook of the segment before it. 



