THE SPIDER CRABS OF AMERICA 281 



Measurements. — Male (17321), length of carapace on median line 

 15.5, to end of horns 17.7, \Wdth of carapace 11.7 mm. 



Range. — From Cape St. Roque, Brazil, to northern Patagonia. 

 Depth, 7 to 30 fathoms. 



Material examined. — See table, page 280. 



PEUA TUMroA (Lockington) 



Plate 99, figs. 2 and 3 



Pisoides? tumidus Lockington, Proc. California Acad. Sci., vol. 7, 1876 

 (1877), p. 30 [3] (type-locality, between tides, near San Diego; type not 

 extant); p. 67 [5], San Bartolom6 Bay and Magdalena Bay. 



Microphrys tenuidus [error for tumidus] { = Pisoides tenuidus) Miers, Chal- 

 lenger Rept., Zool., vol. 17, 1886, p. 83. 



Pelia pacifica Rathbui^ not A. Milne Edwards, Proc. U. S. Nat. Mus., 

 vol. 16, 1893, p. 90; vol. 21, 1898, p. 573; vol. 38, 1910, p. 572 (part); 

 Harriman Alaska Exped., vol. 10, 1904, p. 174 (part). 



Pelia, sp., Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 90. 



Pelia tumida Rathbun, Harriman Alaska Exped., vol. 10, 1904, p. 174. 



Pelia clausa Rathbun, Mem. Mus. Comp. Zool., vol. 35, 1907, p. 72 (type- 

 locality, "Southern California," really Catalina Harbor, see footnote, p. 

 178; holotype, Cat. No. 16203, U. S. N. M.). 



Diagnosis. — Greatest width of carapace about two-thirds its great- 

 est length. Outer margins of rostral horns either parallel or diverg- 

 ing anteriorly. Frontal region strongly deflexed. Of the basal 

 antennal article only the spine or tooth is risible from above. 



Description. — Gastric region much elevated, rounded and often 

 furnished with a small tubercle at the anterior summit. Branchial 

 regions inflated; cardiac region with a small rounded elevation. 

 Rostrum depressed, elongated, varj-ing from one-third in the old 

 male to one-fourth the length of the remainder of the carapace, and 

 bifurcated for about half its length; horns narrow, divergent, and 

 slightly upturned at the tip. The basal antennal article is scarcely 

 visible from above except for the spine or tooth at the antero-ex- 

 ternal angle. 



Chelipcds not so long as first ambulatory leg, stout in well devel- 

 oped males; merus with margins sparingly granulate; hand oblong, 

 compressed, inflated, the edges obtuse and subparallel although 

 slightly arcuate; fingers gaping at base, neatly fitting together along 

 the denticulate distal half of their inner margins; a broad, truncate 

 molariform tooth or tubercle on the inner margin of the movable 

 finger near the base is an important feature of the gape. In the un- 

 developed males (the clausa form) the chelipcds are weak as in the 

 adult females, the chelae small, palms tapering distally, the fingers 

 meeting except for a very slight gape in the basal third or fourth. 



Color. — Chelipcds speckled with dark brownish as far as the mid- 

 dle of the fingers, especially the dorsal aspect; speckles few on wrist. 



