. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 240 BULLETIN OF THE BUREAU OF FISHEBaES. LIBELLULA PULCHELLA. A pair was taken mating on the north shore of pond 4D, and the female deposited 1,500 eggs. These eggs were laid July 12; they began hatching July 22, and tlie hatching was completed by July 28. The Egg.—Curiously enough, the egg of this large species is smaller than that of the little Leucor- rhlnia. It is ellipsoidal in form, measuring mm. in length and mm. in width. The neck is conical, the base nearly twice the height and without any visible segment, but t
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 240 BULLETIN OF THE BUREAU OF FISHEBaES. LIBELLULA PULCHELLA. A pair was taken mating on the north shore of pond 4D, and the female deposited 1,500 eggs. These eggs were laid July 12; they began hatching July 22, and tlie hatching was completed by July 28. The Egg.—Curiously enough, the egg of this large species is smaller than that of the little Leucor- rhlnia. It is ellipsoidal in form, measuring mm. in length and mm. in width. The neck is conical, the base nearly twice the height and without any visible segment, but the tip is divided; there is no process at the posterior end of the egg. The yolk granules are small and indistinct. The Nymph.—This nymph is also just i mm. long; the head is one-third wider than long, one- fourth the entire length; the abdomen is as wide as the head, with two rows of stout bristles on the dorsal surface along either lateral margin; the latero-posterior appendages are very hairy. The antennae are long and slender, black at the tips, with a single black band on the basal joint; the legs have black and white bands, as shown in the figure; the eyes are straw yellow, with two larger black dots and concentric rows of smaller ones; the head between the eyes and whole body is a pale yellow, deepening into orange over the gizzard and rectum; there are whitened areas along the sides of the abdomen at the posterior margins of segments 4 to 7, with darker areas anterior to them. The base of the antennae is whitish, with a black distal band; first joint proximally gray, distally whitish; second joint nearly all dark gray, with a narrow, white distal band; third joint dark gray, except the very tip, which is. Figs. 41 to 43.—Development of Libetlula pulchella: 41. egg; 42, mask of newly hatched nymph; 43, newly hatched nymph. whitish. The whole body is transparent and pale white, a little yellowish on the head and at the posterior end of tlie abdomen; the circulatory
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
