THE SPIDER CBABS OF AMERICA 229 



Genus TRACHYMAIA A. Milne Edwards 



Trachymaia A. Milne Edwards, Crust. R6g. Mex., 1880, p. 351; Bull. Mus. 

 Comp. Zool., vol. 8, Dec. 29, 1880, p. 3; type, T. cornuta A. Milne Edwards • 



Carapace broad, much swollen posteriorly, spinous. Rostrum 

 short, deeply bifurcate. A small preocular spine, a large postocular 

 spine, an infero-orbital spine. Eyes large, flattened almost hori- 

 zontally. Basal antennal article long and narrow; next article 

 inserted on either side of rostrum. Merus of outer maxillipeds with 

 antero-external angle much dilated, antero-internal angle oblique, not 

 notched. Chelipeds elongate, chelae much enlarged. Legs very 

 slender, first one longer than cheliped, remainder diminishing rapidly 

 in length; dactyli long, stj^liform, unarmed. 



Contains but one species. 



TRACHYMAIA CORNUTA A. Milne Edwards 



Plate 80; plate 232, figs. 3-5 



Trachymaia cornuta A. Milne Edwards, Crust. R^g. Mex., 1880, p. 352 

 (type-locality, off Barbados, 82 and 140 fathoms; cotypes, Cat. No. 2763, 

 M. C. Z.); Bull. Mus. Comp. Zool., vol. 8, Dec. 29, 1880, p. 3.— Rathbun, 

 Proc. U. S. Nat. Mus., vol. 17, 1894, p. 63. 



Tachymaia cornuta A. Milne Edwards, Crust. R6g. Mex., 1880, pi. 31 A, 

 figs. 2-2c. 



Diagnosis. — Carapace broad, spines delicate; eyes large and flat; 

 chelipeds long and massive; ambulatory legs filiform. Merus of 

 outer maxillipeds not notched at antero- 

 internal angle. 



Description. — Carapace rough with spin- 

 ules and covered with soft bristles; spines 

 arranged as follows: Four on gastric region 

 forming a transverse diamond; 2 median 

 cardiac, close together; 5 brancliial, three 

 near inner margin, 2 near outer; 1 hepatic 

 and 1 subhepatic spine; on posterior margin 

 a line of 25 small spines terminating above 

 first leg; of this row the median spine and 2 

 near the middle are larger than the others; 

 on the margin of the branchial region there 

 is a line of 4 spines extending forward from fig. 87.-trachymaia cornuta 



■1 /- , 1 1 . PA ■ (11400), MAXILLIPEP, X 11.6 



above first leg; a cluster oi 4 spines on 



pterygostomian region; rostral spines long, sjender, divergent; pre- 

 orbital spine acuminate; postorbital projecting lateraUy much be- 

 yond eye. Eyes large, flattened almost horizontally. A large sub- 

 orbital spine and a spine at angle of buccal cavity. Basal anten- 

 nal article bears a terminal and one lateral spine; second movable 

 article reaches half way to end of rostral spines, remaining portion 

 exceeds rostrum by half its length. In male abdomen, first segment 



