. Bulletin - United States National Museum. Science. r THE SPIDER CRABS OF AMERICA 131 Range.—From Cape Lookout, North Carolina, to Florida Straits, Gulf of Mexico (west coast of Florida) and Yucatan Channel. Depth, 15 to 200 fathoms. Material examined.—See table, page 132. PYROMAIA ARACHNA Rathbun Plates 42 and 43 Pyromaia cuspidata Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 73 (part); not P. cuspidata Stimpson. Pyromaia arachna Rathbun, Proc. U. S. Nat. Mus., vol. 64, art. 14, 1924, p. 1 (type-locality. Gulf of Mexico, SW. of Cape San Bias, Florida; 169 fathoms; station 2400, Albatros
. Bulletin - United States National Museum. Science. r THE SPIDER CRABS OF AMERICA 131 Range.—From Cape Lookout, North Carolina, to Florida Straits, Gulf of Mexico (west coast of Florida) and Yucatan Channel. Depth, 15 to 200 fathoms. Material examined.—See table, page 132. PYROMAIA ARACHNA Rathbun Plates 42 and 43 Pyromaia cuspidata Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 73 (part); not P. cuspidata Stimpson. Pyromaia arachna Rathbun, Proc. U. S. Nat. Mus., vol. 64, art. 14, 1924, p. 1 (type-locality. Gulf of Mexico, SW. of Cape San Bias, Florida; 169 fathoms; station 2400, Albatross; male holotype. Cat. No. 18144, ). Diagnosis.—Three spines on branchial margin. Five median spines on carapace. Rostral spine slender, acuminate. Manus of male cheliped elongate. An erect spine near proximal end of merus of ambulatory legs; a fringe of hair on each side of dactylus. Description.—Adult male: In form, strongly resembles cuspidata. Five median spines on car- apace, no urogastric spine. Three marginal spines on branchial regions; these are exclusive of the spine above postero-lateral margin. Spines more slender than in cuspidata, the gastric, anterior cardiac and intestinal spines being longest. The fine granules of the carapace are further apart than in cuspidata, and the in- terregional depressions are, to some extent, smooth. Rostrum more ascending than in fig49.—pyromaucuspidata cuspidata, and longer, between one-third and one- 3 75^^^ maxilliped, x fourth the postrostral length of carapace; it is tri- angular at base, then abruptly narrows into a slender spine, having usually two enlarged spinules above. The spine on outer margin of basal article of antenna is situated near the posterior end instead of at the middle. Chelipeds and ambulatory legs naked, surface rougher than in cuspidata. Chelipeds less stout, margins spinous; manus swollen, but much narrower than in cuspidata, the length along upper margin twice as great as heigh
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