74 University of California Puhlications. [Zoology 



Arietellus major n. sp. 



PL 9, fig. 17; pi. 11, figs. 43, 44; pi. 12, fig. 56; pi. 13, fig. 80. 



Female : The head, in lateral view, is prolonged into a blunt 

 process (PI. 9, fig. 17) ; sides of last thoracic segment rounded, 

 hut with a blunt projection in the middle of the posterior liorder 

 (PI. 11, fig. 43). Abdomen and furca symmetrical (PI. 11, fig. 

 44), genital segment with a very slight ventral convexity, as long 

 as anal segment and nearly as long as the second and third to- 

 gether. Furcal rami two and one-fourth times as long as broad. 

 Anterior antennae 20-,iointed, not as long as the cephalothorax ; 

 mouth parts and swinmiing feet as in A. setosus Giesbrecht. 

 Fifth feet of the same general shape as in .1. sctosiis, but the ter- 

 minal spine of the outer ramus is nnich shorter, and curved (PI. 

 13, fig. 80). 



Length : Female, 6.2 mm. 



Coloration: Slight reddish tinge to mouth parts, otherwise 

 translucent. 



Occurrence: One female, on the San Clemente trip. Type in 

 the collection of the University of California. 



Arietellus major is readily distinguishable from A. setosus 

 Giesbrecht by the shape of the head and the fifth feet. 



Family PONTELLIDAE. 

 Genus Labidocera Lulibock. 



Labidocera, Giesbrecht ('92), p. 70, 444; ('98), p. 132. 

 Labidocera, Esterly (:05), p. 199. 

 Labidocera, Wheeler, ('99), p. 178. 



Labidocera joUae n. sp. 



PL 9, figs. 22, 23; pi. 12, figs. 50, 51, 53; pi. 14, figs. 89, 91. 



Male: Head with lateral hooks (PI. 9, fig. 22) ; last thoracic 

 segment symmetrical (PI. 12, fig. 53), ending in rather sharp 

 points. Rostrum seemingly asymmetrical (PI. 9, fig. 23), the left 

 prong being very long and sharp, the right short and stout. Gen- 

 ital segment of abdomen longer than any of the others, second 



