THE SPIDER CRABS OF AMERICA 297 



carapace length of 7.5 mm.; spines on upper edge of menis of ambu- 

 latory ^legs 9 to 12, instead of 7 to 10, with 1 to 3 below near the 

 extremity (2 to 3 in camptacantha) , obsolescent on last leg; carpus 

 not tuberculated, but armed in first two pairs with a single spine 

 at inner distal angle of upper surface, unarmed in last two pairs; 

 adults as well as young hairy. 



The basal antennal segment is armed with two spines on the 

 orbital border, counting the antero-external spine, while A. Milne 

 Edwards figures 3 for camptacantha. 



Color. — Carapace a light tan mottled with dark brown; ambulatory 

 legs barred with reddish brown; chelipeds, excepting the light tips of 

 fingers, a still more pronounced red (Weymouth). Large male in 

 formalin (32962), a brilliant crimson all over. 



Measurements. — -Male (32962), total length of carapace 43.3, width 

 41.6 mm. Male (23064) total length of carapace 21.4, width 18.8 

 mm. 



Range.— Monterey Bay, California (Weymouth) to Magdalena 

 Bay, Lower California. 



Material examined. — 



"Western America"; T. Nuttall; 1 female, holotype (Mus. Phila. 

 Acad. Nat. Sci.). 



San Pedro, California; H. N. Lowe; 1 young male (32980). 



Long Beach, California; H. N. Lowe; 1 young male (46757). 



Laguna Beach, California; W. A. Hilton; 2 ovigerous females 

 (48913, 50598). 



San Pedro to Santa Catalina Island, California; Nov. 27, 1913; 

 Anton DoJim; from Venice Marine Biological Station; 2 young 

 (50263). 



Isthmus Harbor, Santa Catalina Island, California; Venice Marine 

 Biological Station; 1 young male (46416). 



Catalina Harbor, Santa Catalina Island, California: P. S. Barnhart, 

 Anton DoJim; from Venice Marine Biological Station; 3 young males, 

 2 yoimg females (50256). Beach; W. H. Dall; 1 young female 

 (16320). Depth, 30 to 40 fathoms, sandy mud; W. H. Dall; 3 

 young (16321). 



San Clemente Island, California; H. N. Lowe; 2 males (23064, 

 32962). 



San Diego County, California; C. R. Orcutt; 1 young male (16323). 



Southern California: Anton Dohm; Venice Marine Biological Station; 

 1 young male, 1 young female (50255). W. H. Dall; 3 young (16322). 



Lower California, Mexico; off Magdalena Bay; 1889; Albatross: 

 Lat. 24° 58' 30" N.; long. 115° 52' 30" W.; 34 fathoms; coralline; 

 temp. 63.9° F.; March 2; station 2988; 1 young female (16346). 

 Lat. 24° 58' 15" N.; long. 115° 53' 00" W.; 36 fathoms; coralline; 

 temp. 64.3° F.; March 2; station 2989; 1 young male (16345). 



