AQUATIC INSECTS IN NEW YORK STATE 247 



Previously I had found the species, likewise in transformation, 

 at MacLean N. Y., when on May 30, 1S97, in company with 

 Mr A. D. MacGillivray, I went on a collecting trip from Ithaca 

 thither. There it inhabited a spring-fed pool near the banks of 

 Fall creek. Specimens in all stages were picked from the culms 

 of the grasses and sedges standing in the pool. 



The imagos appear to keep rather close to shelter and to their 

 native shallows, spending but little time on the wdng. Trans- 

 formation takes place for the most part in the morning or early 

 forenoon, and the place selected is at most but a few inches 

 above the water. The species is of wide distribution, but is 

 everywhere quite local. Imagos will be readily recognized from 

 the unique combination of blue and yellow on the thorax, shown 

 on plate 13, figure 2. 



Nymph. Measures in length 12mm, gills 6mm additional. 

 Color greenish brown, paler beneath, marked with darker brown 

 on frons, hind angles of the head sides of thorax and middle of 

 abdominal segments; legs with two darker transverse bands on 

 the femora and a less distinct, basal one on all tibiae; gills 

 greenish brown, with a series of darker points along the spinoise 

 margins and with paler apexes. 



Body slender; head wide, with large and strongly angulate 

 hind angles and a deep posterior notch between them ; antennae 

 seven jointed. Labium rather short, the hinge reaching poster- 

 iorly between, but not beyond, the bases of the fore legs. 

 Median lobe moderate; mental setae three each side; lateral 

 setae five. Thorax narrower than the head. Legs slender, very 

 scantily hairy, but with a double inferior row of spines. Wings 

 reaching posteriorly well on the base of the fifth abdominal 

 segment. Abdomen with sides parallel, or very little tapering 

 toward the tip. Gills narrowly oblanceolate, widest at four 

 fifths their length. 



AMPHIAGRION 



A single species falls within the limits of our fauna. 



Amphiagrion saucium Burmeister 



Plate 18, fig. 1-3; plate 15, c 



1839 A g r i o n saucium et A. d i s c o 1 o r Burmeister, Handb. Ent. 



2:819. 

 1876 A m p h 1 a g r i n saucium Selys, Acad. Belg. Bui. (2) 41:285 

 1890 Amphiagriou discolor Kirby, Cat. Neur. Odon. p.l43 

 1893 Amphiagriou saucium Calvert, Am. Ent. Soc. Trans. 

 20:235 



