THE SPIDER CRABS OF AMERICA 121 



COLLODES TUMIDUS Rathbun 



Plate 40, figs. 1 and 2; plate 218, fig. 5 



Collodes iumidus Ratiibun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 569, 

 pi. 41, fig. 1 (tj'pe-locality, Magdalena Bay, Lower California, 12 fathoms; 

 holotype, Cat. No. 2157f, U. S. N. M.). 



Z)m(7 /I osis.— Carapace mostly smooth; four elevated tubercles 

 forming a cross near the middle. Postorbital lobe curved. Male 

 sternum finely granulate. 



Description. — Carapace granulate along the posterior and lateral 

 margins, the granules large on the hepatic region and reaching for- 

 ward a little on the branchial and cardiac regions; a few granules 

 also between the orbits. Four tubercles near the middle of the cara- 

 pace at the most elevated portions, one gastric, one cardiac, the other 

 two at the inner angles of the branchial regions. Otherwise the 

 central part of the carapace is smooth. Front bidentate, the teeth 

 triangular, blunt, and separated by a space subequal to either tooth. 

 Postorbital tooth slightly curv- 

 ed, convex forward, shorter 

 than the eye. Basal antennal 

 article broad, inner or lower 

 edge entire, outer edge un- 

 evenly dentate, upper and fig. 47.-collode9 tumidus, m1le'"(2157i), 

 lower terminal lobes equally left chela, x 9.33 



advanced. Male sternum and elevations of first three abdominal 

 segments finely granulate; otherwise the abdomen of both sexes is 

 nearly smooth. 



Chelipeds of adult male slightly enlarged. The palm narrows 

 perceptibly near the distal end. Fingers gaping to near the tips, 

 dactylus with an enlarged tooth near the base, fixed finger with a 

 similar tooth marldng the proximal third. Ambulatory legs rather 

 stout. 



Measurements. — Male, holotype, length of carapace 11.6, width 

 9.5 mm. 



Range. — Lower California, Mexico; 10 to 12 fathoms. 



Material examined. — 



Middle of east side of Cerros Island; March 12, 1911; Albatross; 

 1 young female (56221). 



Magdalena Bay, Lower California; lat. 24° 32' 00" N.; long. 111° 

 59' 00" W.; 12 fathoms; fne. gy. S.; May 2, 1888; station 2831, 

 Albatross; 1 male, holotype (21571). 



Southern part of Gulf of California; lat. 24° 11' 30" N.; long. 

 109° 55' 00" W.; 10 fathoms; Sh.; April 30, 1888; station 2828, 

 Albatross; 1 female (21868). 



