62 University of California Puhlications. [Zoology 



one by about one-sixth the length of the latter. First outer mar- 

 ginal lobe of the maxilla with eight bristles, inner ramus with 

 four. Outer ramus of first foot 2-jointed, without spine in middle 

 of outer border of first joint ; the distal spine of the joint extends 

 well beyond the end of the second joint. The distal spine of the 

 second joint of outer ramus of the second foot reaches to the end 

 of the first outer marginal spine of the third joint ; the middle 

 spine of the third joint reaches over half way to the base of the 

 third outer marginal. 



Length : Female, 6 mm. 



Coloration : Kather translucent, with a light shade of red 

 along the sides of thoracic segments and in the feet. 



Occurrence : One female, Coll. 1045. Type in the collection 

 of the University of California. 



The form of the genital segment is a sufificiently distinct char- 

 acter for this species. 



Euchaeta spinifera n. sp. 



PI. 9, fig. 8; pi. 11, fig. 35; pi. 14, figs. 82, 83. 



Male: Head (PI. 9, fig. 8) much as in the female of E. te- 

 nuis; last thoracic segment long, rounded at the sides, and with 

 a curved, thorn-like projection on the dorsal margin (PI. 11, fig. 

 35). Abdomen with genital and anal segments equal in length, 

 the second segment longer than any other, and nearly as long as 

 the last two. Anteri(n' antennae reaching to end of furca. First 

 foot with 3-jointed outer ramus, the outer marginal of the first 

 joint very small. In the second foot the outer margin of the third 

 joint of the outer ramus is deeply concave distal to the middle 

 spine ; the outer marginals are all short and ])lunt, except the 

 middle spine of the third joint, which reaches half way to the base 

 of the third. The fifth feet are slender ; inner ramus of the left 

 foot half as long as the first joint of the outer ramus. The second 

 joint of the ramus ends distally in a pyramidal toothed process 

 (PI. 14, figs. 82, 83). The terminal joint of the outer ramus of 

 the right foot ends bluntly. 



Length : Male, 5.1 mm. 



Coloration : No pigment in body or appendages, but the plu- 

 mose bristles of the feet and furca are iridescent. 



