BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Color. Specimens in alcohol have a greenish-blue carapace mot- 

 tled with purple; upper proximal half of chelae reddish -brown ; 

 upper surface of legs covered with a pattern of fine dots of dark pur- 

 ple on a light ground. 



Measurements. Holotype male, length of carapace 11.6, width be- 

 tween outer angles of orbits 14.2, width at postero-lateral angles 13.1 

 mm. 



Material examined. Eight males and eight females were taken at 

 the type-locality. 



SESARMA (HOLOMETOPUS) BIOLLEYI Rathbnn. 



Plate 87, figs. 2 ancj 3. 



Sesarma (Holometopus) biolleyi RATHBUN, Proc. Biol. Soc. Washington, 

 vol. 19, 1906, p. 100 (type-locality, Salinas de Caldera, Boca del Jesus 

 Maria, Costa Rica; holotype male, Cat. No. 32490, U.S.N.M.). 



Diagnosis. Narrowed anteriorly. Front half width of carapace. 

 Merus of third leg three times as long as wide. 



n Description. Carapace a little broader 

 than long and broader behind than before, 

 very uneven, densely granulate anteriorly. 



punctate and wrinkled posterior^. Front 

 one-half width of carapace, vertical, widen- 

 ing below, lower edge projecting, convex in 

 front view, slightly sinuous in dorsal view; 

 superior lobes more transverse and more 

 sharply marked than in the preceding species. 

 Upper margin of orbit sinuous, very oblique, 

 outer tooth acuminate. 



Chelipeds rugose, the rugae becoming sin- 



Fio. 150. SESARSIA (HoL- 6 



OMETOPDS) BIOLLEYI, AH- gls tubercles or granules on the distal hall of 

 DOMEN OB- MALE HOLD- the palm ; the latter much inflated, inner face 



TYPE, X 3J. -11 



sparingly granulous, a transverse row of gran- 

 ules near the distal end. Prehensile teeth of fingers fewer and 

 stronger than in $. miersii. Inner laminar expansion of arm rather 

 deeply cut into jagged teeth. 



Legs long and narrow, third pair two and one-half times as long as 

 carapace, its merus three times as long as wide. 



Measurements. Male holotype, length of carapace 19.1, anterior 

 width of same 20.2, posterior width 21, width of front above 11.3 mm. 



Habit. Lives in mangroves. 



Range. Pacific coast of Costa Rica. 



Material examined. Costa Rica; P. Biolley and J. F. Tristan: 



Punta Arenas; Jan. 19, 1907; 2 males (39101). Feb., 1907; 4 

 males (39092). 



