NO. 3556 PORTUNID CRABS—-STEPHENSON AND REES 9 
Trat Bay off Lam Son Village, near Cambodian border, 11°57’00’N.., 
102°44’45”E. GVF Sta. 27, Oct. 29, 1957, 1 male (without chelipeds) 
(32 mm.). 
Distripution.—Karachi to eastern Australia. 
Charybdis (Charybdis) curtilobus, new species 
PLATE 1A 
Mareriau.—Philippines: Sta. 5594, near Mount Putri, 4°14’20’N., 
117°53’12”E., 11 fm., Sept. 30, 1909, Alb., 1 female (21 mm., holo- 
type, cat. no. 111729). 
Description—Front: 6-toothed. Medians rounded, protruding 
slightly beyond submedians, separated by narrow incision. Subme- 
dians broader, lobelike, with inner border curved and outer border 
running straight backward. Laterals roundedly triangular. Front 
distinctly separated from and prominent beyond inner supraorbital 
angles. These strongly arched and short (about as broad as lateral 
frontal lobes). 
Anterolateral teeth: Six. First four stout and square cut, but 
with distinct anterior points becoming sharper in more posterior 
teeth. Fifth tooth sharp and the smallest. Sixth distinctly the 
largest. 
Carapace: Relatively broad, B./L.=1.7. Posterolateral borders 
strongly convergent forming curve with nearly straight posterior 
border. Bearing sparse pile of fine hairs on frontal and lateral por- 
tions, microscopically granular throughout. Following ridges present: 
Frontals (short), protogastrics (convex anteriorly), mesogastrics (con- 
tinuous sinuous line), epibranchials (interrupted at cervical groove 
but not in midline), cardiac (obscure), anterior mesobranchial (short, 
oblique), posterior mesobranchial (forward surface only ridgelike, 
remainder an extensive granulated area). 
Chelipeds: Right larger. Granular and pilose on upper and outer 
surfaces. Anterior border arm with two spines, posterior border 
smooth. Wrist normal. Upper surface palm with two granular 
carinae terminating in spines about four-fifths distance along seg- 
ment. Outer surface with three carinae, uppermost the most granu- 
lar. Inner surface with ill-developed, smooth, central carina. Under 
surface microscopically granular. 
Fifth lee: Merus short (L./B.=1.7), with posterior spine. 
RemARKS.—This species resembles C. rathbuni Leene (1938, pp. 
97-99, fig. 52) but differs as follows: 
a. Broader carapace (B./L. ca. 1.7 instead of ca. 1.4) due mainly 
to the longer last anterolateral tooth. 
b. Narrower inner orbital lobe which is not much wider than 
the lateral frontal lobe. The specific name refers to this feature. 
