THE SPIDER CRABS OF AMERICA 369 



greatest width of the carapace. Rostral teeth more advanced than 

 orbits, horizontal, separated by a V-shaped interspace. Orbital 

 angles acute, outer margin of outer tooth oblique and sinuous. Lat- 

 eral teeth five, acute, curved, the second and fifth reduced, the 

 second united at base with the third. Carapace nearly smooth; 

 almost the only granules are near the last lateral tooth and in the 

 row above the posterior margin. First movable segment of antenna 

 with a short outer lobe which is directed forward (fig. 117, d). 



The chelipeds of old males are from l}4 times to nearly twice as 

 long as carapace; palms from twice to three times as long as wide; 

 arm subcylindrical and nearly smooth; wrist with a longitudinal 

 ridge, otherwdse smooth. 



Appendages of first segment of male abdomen with the distal third 

 of a light bro^^'n color, gradually tapering and arranged in the form of 



a lyre, widely spreading at tips (fig. 

 116, 6). 



Measurements. — Male (15093), length 

 of carapace to tips of rostral teeth 30.5, 

 width of carapace including spines 28.8, 

 excluding spines 25, f ronto-orbital width 

 16.2 mm. Female (14077), length of 

 carapace 29.2, width of carapace in- 

 cluding spines 27, excluding spines 24.2, 

 f ronto-orbital width 14.5 mm. 



Variations. — The spinop of the cara- 

 pace, rostral, orbital and lateral, may be 

 more slender and elongate than usual. 

 Fig. 118 —PiTHo ANisoDON (6424), MAxiL- as Ltt a small female (46721). The 

 UPED, X 8.58 second lateral spine, commonly of small 



size, may be suppressed on one side while normal on the other 

 (22269,33152, 39471), or it may occur in the sinus between the second 

 and fourth spines (male, 33151), instead of between the first and third. 

 Range. — Bahamas and Florida Keys to Guadeloupe and Curasao. 

 Material examined. — See table, page 370. 



PrTHO QUADRroENTATA (Miers) 



Plate 132, fig. 2; plate 133, fig. 2; plate 250, fig. 10 



Othonia quadridentata Miers, Ann. Mag. Nat. Hist., ser. 5, vol. 4, 1879, p. 



15, pi. 5, fig. 1 (type-locality, West Indies; types in Brit. Mus.). 

 Othonia Iherminieri Benedict (not Schramm), Johns Hopkins Univ. Cir., 



vol. 11, No. 97, April, 1892, p. 77.— Rathbun, Proc. U. S. Nat. Mus.. 



vol. 15, 1892, p. 255 (part). 

 Pitho quadridentata Rathbun, Ann. Inst. Jamaica, vol. 1, 1897, p. 9. 



Diagnosis. — Four lateral spines, large, acute, pointing well out- 

 ward. Teeth of front and orbits blunt. Distal third of male 

 appendages lyre-shaped. 



