242 BULLETIN OF THE BUREAU OF FISHERIES. 
segments, and fades into small, yellow dots on the anterior margins of the fifth, sixth, and seventh, and 
sometimes the eighth, segment, disappearing entirely on the ninth, and often on the eighth segment. 
The dorsal appendages on the tenth segment are light brown at the base, yellow at the tip; the lateral 
and inferior appendages are dark brown. The base of the antennz is yellow distally and proximally 
with a narrow, black band through the center; first joint dark, with a narrow, distal, white band; 
second joint with a broader, distal, white band; third joint entirely blackish brown. 
The Mask.—Mentum with the width to the length as 5 to 3, distal margin two-thirds wider than the 
proximal; three lateral sete, one marginal seta; three mental sete in a straight line on either side of the 
center. Lateral lobe with its length to its width as 9 to 7; two marginal sete on the outer border; two 
setz on the blade of the lobe; raptorial seta just reaching the tip of the movable hook, the latter long and 
stout; distal margin crenate, without teeth. 
LEUCORRHINIA INTACTA. 
The sexes remain in union only a short time and usually alight on some convenient weed or bush 
near the water’s edge, where they can be easily secured. When thus captured, the female is ready to 
lay as soon as taken from the net and will deposit 100 to 200 eggs, the first 50 or 75 coming in a mass 
stuck together, the others coming singly. Eggs laid July 18 hatched July 3o. 
The Egg.—This egg is more nearly spherical than that of Libellula luctuosa, and has diameters of 
0.60 mm. and 0.40 mm., respectively. The neck is wider at the base than it is high, and there isa distinct 
segmentation at about the center; the tip is not divided, and there is no process on the posterior end of 
egg. The yolk granules are comparatively large, and the jelly envelope is ragged around the surface of 
the egg and not smooth, as in other species. 
The Nymph.—Although the imago of Leucorrhinia is much smaller than that of Libellula luctuosa the 
49 
Fics. 49 to 51.—Development of Leucorrhinia intacta: 49, egg; so, mask of newly hatched nymph; sr, newly hatched nymph. 
nymph is considerably larger, measuring 1.20 mm. in length; the head is one-third wider than the abdo- 
men; the front legs are the same length as the body, the others proportionally longer, and all three 
pairs slender. Both the body and the legs are quite transparent and pale orange yellow in color, the 
legs and antenne transversely banded with gray and white, the eyes darker orange yellow, the black 
spots very small. The sides of the head and a wide transverse band across the anterior portion of 
each abdomen segment are whitish, the posterior margins of the segments are tinged with brown. 
The bases of the antennz are whitish yellow proximally, with a narrow, gray, distal band; first joint 
entirely white, a little grayish through the center; second joint with a very narrow proximal band 
and a wider distal band white, grayish through the center; third joint entirely gray. 
The Mask.—Mentum three times as wide as long; the distal margin twice the length of the proximal; 
no lateral sete; two marginal sete; three mental sete on either side, not in line, but the proximal one 
nearest the midline; two stout spines at the center of the distal margin. Lateral lobes with length and 
width in the proportion of 13 to 9; two sete on the outer margin on either side; two sete on the blade of 
each lobe; raptorial seta reaching considerably beyond the tip of the movable hook, the latter long 
and narrow; three small teeth near the outer edge of the distal margin, the central tooth the largest, the 
rest of the margin smooth. 
