. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 407 Mus., vol. 15, 1892, p. 265 (part; pleuracanihus excluded).—Verrill, Trans. Conn. Acad. Arts and Sci., vol. 13, 1908, p. 404, text-fig. 40, pi. 23, figs. 3 and 4; pi. 24, fig. 1. Mithrax Desbonxe and Schramm, Crust. Guadeloupe, 1867, p. 8, pi. 2, figs. 4 and 5. Mithrax depressus A. Milne Edw.\rds (part). Crust. R<5g. Mex., 1875, p. 96, not pi. 20, figs. 4-4c (specimens from Woman Key; 7 cotypes in M. C. Z.). Diagnosis.—-Three antero-lateral branchial spines, the anterior one of which is bifid, and a postero
. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 407 Mus., vol. 15, 1892, p. 265 (part; pleuracanihus excluded).—Verrill, Trans. Conn. Acad. Arts and Sci., vol. 13, 1908, p. 404, text-fig. 40, pi. 23, figs. 3 and 4; pi. 24, fig. 1. Mithrax Desbonxe and Schramm, Crust. Guadeloupe, 1867, p. 8, pi. 2, figs. 4 and 5. Mithrax depressus A. Milne Edw.\rds (part). Crust. R<5g. Mex., 1875, p. 96, not pi. 20, figs. 4-4c (specimens from Woman Key; 7 cotypes in M. C. Z.). Diagnosis.—-Three antero-lateral branchial spines, the anterior one of which is bifid, and a postero-lateral spine. Rostral sinus dis- tincth' U-shaped, as wide, or nearly as wide, as either horn. Two spines on anterior margin of arm. Description.—Carapace swollen, considerably wider than long, smooth, except for some low, rounded prominences chiefly toward the outer margin of the branchial region. Gastric tubercles very faint. Front wide; horns short, obtuse, interspace U-shaped, as wide as either horn. Preorbital angles blunt, slighth^ pro- duced. Basal joint of antenna with two teeth, inner one nearly reaching line of rostrum, the other smaller, on or- bital border; besides, the orbit has four tubercles on margin, two superior, much smaller than external or inferior tubercle. Lateral margin armed with five spini- form teeth; the first obtuse, often bifid at extremity; the second longer, sharp and double, curving forward; third and fourth more slender and about the same length; fifth postero-lateral, much smal- ler, and situated higher up on cara- pace; in a transverse oblique line with this spine are two tubercles or a spine and a tubercle. Subhepatic region with two tubercles; a number of tubercles, some of them pointed, are on the subbranchial and pterygostomian regions. Arm with four or five spines on upper margin; two on inner margin; and a few tubercles on the upper surface. Wrist smooth; inner margin evenly rounded. Hand smooth; fingers narrowly gaping; a broad
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