164 University of California Publications. [ ZooLoGy 
1. Scolecithrix danae Lubbock. 
Undina danae Lubbock, 1856, p. 21, pl. 4, figs. 6-9. 
Scolecithriz danae Brady, 1883, p. 57, pl. 17, figs. 1-12. 
Scolecithrix danae Giesbrecht, 1888, p. 333; 1892, pp. 265, 283, pl. 
pl. 13, figs. 4, 9, 14, 17; pl. 37, fig. 6; 1898, p. 42. 
hin 
Fig. 26.—Scolecithriz danae. (a) Female, lateral, X20. (b) Genital seg- 
ment, female, lateral, X83. (c) Outer ramus of first foot 
of female X140. (d) Fifth foot of male X83. fRe.1dz., 
first joint of outer ramus of right foot. Re.sn., outer ramus of 
left foot. Ri.sn., inner ramus of left foot. 
2 Fourth thoracic segment separate from fifth, latter with 
rather flat, rounded lateral angles. Third and fourth segments 
of the abdomen broader than long, genital segment with ventral, 
shovel-shaped process (fig. 265), anal segment short. Anterior 
antennae with nineteen segments, reaching beyond posterior 
border of the thorax but little. Outer ramus of posterior antennae 
9/7 as long as the inner ramus, seventh joint of outer ramus 
without proximal bristle. Second basal of maxilla with five, 
inner ramus with six, outer with five bristles (ef. fig. 29c). First 
-—- —_e SS eae 
