384 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



E2. Carpus of cheliped covered with tubercles, about 15 in 



number. Fingers deeply grooved paulensis, p. 395. 



D^. Margin of front without a small tooth at outer ends. Carapace 

 deeply furrowed. Supra-orbital tooth defined by open 



fissures sinaloensis, p. 398. 



C^. Color of immovable finger continued well backward and also upward 



on palm. Edge of front thick, beveled schmitti, p. 393. 



B2. Fifth lateral tooth almost obsolete caribbaeus, p. 399. 



A^. Fingers white or nearly so. 



B'. Fingers not deeply grooved. Short granulated ridges on carapace. 



C^. Carpus and manus granulate, without tubercles hemphillii, p. 400. 



C^. Carpus and upper surface of manus covered with tubercles. 



nicaraguensis, p. 395. 



B2. Fingers deeply grooved. First two lateral teeth similar to, but smaller 



than, remaining teeth quinquedentatus, p. 402. 



ANALOGOUS SPECIES OF HEXAPANOPEUS ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



schmitti sinaloensis 



paulensis nicaraguensis 



HEXAPANOPEUS ANGUSTIFRONS (Benedict and Rathbun) 



Plate 169, Figures 1 and 2 



Panopeus angustifrons Benedict and Rathbun, Proc. U. S. Nat. Mus., vol. 14, 

 1891, p. 373, pi. 22, fig. 3; pi. 24, fig. 18 (type-locality. Long Island Sound, 

 6-7 fathoms; type, Cat. No. 15669, U.S.N.M.). 



Hexapanopeus angustifrons Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 

 4, 1898, p. 273.— Sumner, Bull. Bur. Fisheries, vol. 31, 1911, part 2, 1913, 

 p. 674.— Hay and Shore, Bull. Bur. Fisheries, vol. 35, 1915-16 (1918), 

 p. 436, pi. 34, fig. 7. 



Diagnosis. — Anterior margin of third lateral tooth transverse. 

 Hepatic tubercle obsolete. Deep groove on carpus. Color of 

 immovable finger not extended on palm. Outer ends of third ab- 

 dominal segment of male rounded. 



Description. — Carapace convex, lateral teeth ascending; areolations 

 fairly well marked; front narrow, much produced, four-lobed, lateral 

 lobes small, their outer margin oblique; median notch V-shaped, 

 continued in a narrow or closed fissure ; margin between the two supra- 

 orbital fissures produced, arcuate; antero-lateral edge thin, shorter 

 than postero-lateral ; sinus of coalesced tooth shallower in adult than 

 in young; orbital angle acute, next tooth arcuate or lobiform; third 

 and fourth teeth short and broad, anterior edge of third tooth nearly 

 at right angles to median line, posterior edge much longer than 

 anterior and directed obliquely backward and outward from tip; 

 fourth tooth with posterior margin a little longer than anterior and 

 subparallel to median line; fifth tooth shorter and sharper. Inner 



