166 University of California Publications. [ ZooLoGy 
Length: Female, 1.4 mm. 
Occurrence: June 14, 1904, one female. 
3. Scolecithrix persecans Giesbrecht. 
Scolecithrix persecans Giesbrecht, 1895, p. 253, pl. 3, figs. 6-12; 
1898, p. 48, fig. 9. 
Fig. 28.—Scolecithrix persecans. (a) Male, lateral, X9. (b) Second foot, 
male, X45. (c) Left fifth foot of male X83. (d) Right 
fifth foot, male, X83. fe.3, third joint of outer ramus. 
(e) Fifth foot of female. 
4 Tead with rather high crest (fig. 28a), last two thoracic 
segments fused; left anterior antenna 18-jointed, right 17- 
jointed, reaching beyond cephalothorax. Outer ramus of pos- 
terior antennae at least 114 times as long as inner; second basal 
of maxilla with five, outer ramus with eight, inner with seven 
bristles. appendages of anterior maxilliped in part pencillate. 
First basal of fourth foot with feathered inner border; middle 
of outer border of first basal of second and third feet with a 
small tooth, outer border of second basal of second to fourth feet 
with a tooth (fig. 285) ; spines on outer margin of the two prox- 
