132 University of California Publications in Zoology [Vol. li 



D. Chelifori 2- or 3-jointed; palpi 8- or 9-jointed. 



E. Lhelifori 2-jointed; palpi 8-jointed Genus Ammothea 



F. Chelifori more than half as long as the proboscis; 

 caudal segment reaching at least to middle of second 

 coxal joint of fourth pair of legs..A. latlfrons Cole 

 F'. Chelifori less than half as long as proboscis. 



G. Proboscis narrow, fusiform; forms less than 4 



mm. in length and 20 mm. in extent. 



H. I'rutuberance on dorsal side of first coxal joint 



about half as long as the joint; genital 



protuberance in male about the same length 



A. alaskensis Cole 



H'. Protuberance on dorsal side of first coxal joint 

 fully three-fourths as long as the joint; 

 genital protuberance in male only about half 

 as long as protuberance on first coxal joint 



A. gracilipes Cole 



H". Protuberance on dorsal side of first coxal 

 joint less than half as long as the joint, 

 short and blunt; no protuberance on lateral 

 processes; no triangular projection on disto- 

 dorsal aspect of first joint of chelifore. 



Female larger than male 



A. nudiuscula sp. nov. 



G'. Proboscis broadly clavate, truncate at apex; 

 forms over 4 mm. in length and 20 mm. in 



extent A. pribilofensis Cole 



E'. Chelifori 3-jointed; palpi 9-jointed..Genus Ammothella 

 F. Eye tubercle low, rounded. 



G. First two or three trunk segments with a conical 



tubercle dorsally near the posterior border 



A. tuberculata Cole 



G'. No tubercle dorsally in such position; terminal 

 claw very rudimentary; auxilliary claws greatly 



developed; from California coast 



...A. bi-unguiculata Dohrn var. califomica Hall 



F'. Eye tubercle tall, slender; caudal segment slender, 



curved, elevated, spinose. 



6. First and second trunk segments with a pair of 



spines dorsally near the posterior border; no 



spine-bearing processes on dorsum, nor on tibial 



joints A. splnif era Cole 



G'. Three spine-bearing processes on dorsum; two 

 rows of spine-bearing processes along the dorsal 



margin of tibial joints A. spinoslssima Hall 



D'. Chelifori usually 1-, sometimes 2-jointed; palpi 6- or 



7-jointed Genus Tanystylum 



E. Chelifori 2-jointed T. intermedium Cole 



D". Chelifori 1-jointed; palpi 4-jointed: body very much 

 shortened Genus Clotenia — C. occidentalis Cole 



