248 BULLETIN OF THE BUREAU OF FISHERIES. 
the other pair free, she will deposit her eggs freely in any convenient receptacle if the 
tip of her abdomen be dipped in water. Thousands of eggs can be obtained in this way 
in a short time and kept until they hatch, or they can be placed at once in the breeding 
pond. The eggs of Anax, Aischna, and the damselflies can be secured by watching the 
females while ovipositing and then transferring the leaves or stems containing the eggs 
to the breeding pond. 
11. If there is any necessity for rearmg the nymphs before placing them in the 
breeding pond, they can be fed on Paramcecium obtained by making an infusion of ma- 
nure in water, or on ordinary tow, especially the small crustacea, which they will devour 
in large numbers. Warren carried dragonfly nymphs successfully through their entire 
life history by feeding them with mosquito larve and pupe. 
12. Whenever a fishpond is drained, the nymphs in it should be saved; they make 
excellent food for fish in other ponds and can be fed to them or can be used to restock 
the drained pond when it is filled again. 
13. Dragonfly eggs hatch in 8 to 12 days; the nympa is short and thickset, the thorax 
and abdomen about as wide as the head, the legs long and slender, the antenne short and 
fairly stout, the eyes large, with black retinal spots surrounded by rings of colored pig- 
ment. ‘The mentum of the mask is much wider than long, with three mental sete on 
either side and a varying number of lateral and marginal setae. The lateral lobes have a 
terminal, movable hook, one raptorial seta, marginal sete on the outer margin, and usu- 
ally two small setee on the blade of the lobe. The respiratory tracheze are convoluted 
in the thorax and posterior abdomen and comparatively straight between the two, and 
are highly colored. 
14. Damselfly eggs hatch in about three weeks; the nymph is long and slender, the 
thorax and abdomen considerably narrower than the head; the legs relatively short and 
slender; the antenne stout and long; the eyes small with few retinal spots, but each sur- 
rounded by colored pigment. The mentum is somewhat wider than long, with a single 
mental seta on either side and one or twolateral and marginalsete. The lateral lobes have 
a stout, terminal, movable hook and one raptorial seta. The respiratory trachee are 
highly colored and are convoluted in the thorax and anterior abdomen and are compara- 
tively straight posteriorly. The caudal gills are cylindrical, very long and slender, and 
taper regularly from the base to the tip. 
ANNOTATED LIST OF DRAGONFLIES AND DAMSELFLIES OBTAINED 
NEAR FAIRPORT, IOWA. 
THE GENUS GompHus.—The nymphs of this genus live in the mud or sand on the 
bottom of the Mississippi and its tributaries, and thus far none of them has been found 
in any of the fishponds. ‘There is no reason, however, why pond species like grasJinellus 
and submedianus should not be found there, as they probably will be in the future. 
They burrow into the mud and débris, leaving only the tip of the abdomen exposed for 
respiration, and lie in wait for their prey. They are both rapacious and omnivorous 
and will eat anything and everything smali enough to be caught and held by their power- 
ful jaws. They may be recognized by their thick and hairy, four-jointed antennz, which are 
usually inclined inward toward each other, by a flat labium simply folded beneath the 
chin, with strong grasping arms like mandibles and not extending up over the face in a 
