AQUATIC INSECTS IN THE ADIRONDACKS 415 



having made their way upstairs, seeking their freedom. They were not 

 observed flying, except from the place of transformation to the window. 



Empty nymph skins were, on the contrary, very abundant. There 

 were hundreds sticking to the sides of the hatchery troughs, thickest 

 near the inflow pipe, but some were to be found on aU the troughs. 



Observing that the season for the species was waning, we lost no time 

 emptying the supply trough and sifting its contents. Thus we obtained 

 two nymphs, one of which was reared. 



Imago. Length to tip of wings 12 mm; antennae 7 mm more. 

 Setae two thirds as long as the abdomen, hardly surpassing the tips of 

 the wings. Expanse of wings 21 mm. 



Color light green. Antennae brownish black, except a small paler 

 part just beyond the base. A broad U-shaped mark on the top of the 

 head, just including the ocelH, A blackish brown stripe each side of the 

 prothorax, darkest anteriorly, continued on the mesothorax, ditfused 

 posteriorly. Abdomen greenish, washed with brown dorsally, specially 

 toward its lateral margins. Setae brownish. Legs greenish, a flttle 

 darker exteriorly and at the tips of the tarsal segments. Wings green ; 

 veins very faintly touched with brown. 



Nymph. Fully grown, measures 9 mm; setae 7,.^ mm more. 



Body slender, sHghtly depressed. Head hardly wider than prothorax 

 or than abdomen; the latter a little widened in the middle and a little 

 more narrowed at the posterior than at the anterior end. 



Color greenish to pale brownish. Antennae green at base, becoming 

 brownish at tip, stout at base, rapidly tapering. The broad U-shaped 

 mark on the top of the head in the adult is present in the nymph, the 

 base of the U being laterally extended in a transverse band which meets 

 the eyes and extends two angles anteriorly toward the mouth each side. 

 Prothorax with two lateral stripes, darkest anteriorly. Two pairs of small 

 spots on mesonotum and on metanotum between the bases of the wings. 



Abdomen with three distinct blackish brown stripes, a median one 

 and two lateral ones, the latter ending on the bases of the setae. 

 Setae stout at base, rapidly tapering ; brown at base, becoming paler 

 distally. Legs pale greenish. Ventral aspect, whitish or pale green. 



No tracheal gills. 



Numerous specimens. Adirondack hatchery, Saranac Inn N. Y. 

 June. Observed till June 21, when the last specimen was taken. 



LEUCTRA 



This genus includes the slenderest of stone flies; small, brownish 

 species, with wings closely inwrapping the body on the dorsal side. Mr 

 McLachlan says that the females in this genus carry their eggs on their 

 backs, extruding them from the upturned end segment of the abdomen 

 and pushing them toward the bases of the hind wings. ^ 



1 Ent. month, mag. 18G5. 1:216. 



