124 
BULLETIN OK THE UNITED STATES FISH COMMISSION. 
Length of body, 102 mm.; length of large cheliped, 116.5 mm. 
Known from Rio Grande, Texas; Antilles; Escondido River, Nicaragua; Sabanilla, United States 
of Colombia (Albatross)-, Brazil, as far south as Rio Grande do Sul; Panama; Ecuador; West Africa. 
Porto Rican localities: Rio Bayamon; San Juan market; Rio Bayamon, above Palo Seco; Aguadilla; 
Mayaguez, in fresh water; Poi.ce; Isabel II Vieques Island; Fajardo; Rio Arecibo (Gundlach). 
Common name, Noca (Gundlach). 
Bithynis olfersii (Wiegmann). 
Palsemon olfersii Wiegmann, Arch. f. Natur., n, pt. 1, 150, 183G: Ortmann, Zool. Jahrb., Syst., v, 733, y>l . xi.vii, f. 8, 1891. 
Palemon spinimanus Milne Edwards, Hist. Nat. Crust., ii, 399, 1837. 
Palsemon spinimanus von Martens, Arch. f. Natur., xxxv, pt. 1, 26, pi. ii, £. 3, 1869. 
Palsemon faustinus Saussure, M<5m. Soc. Phys. Hist. Nat. Geneve, xiv. 469 ( 53), pi. iv, f. 30, 1858; Ortmann, Zool. Jahrb., Syst., 
V, 734, 1891; Rev. Mus. Paulista, ii, 213, 1897. 
Palsemon olfersi Ortmann, Rev. Mus. Paulista, ii, 212, pi. I, figs. 10 and 11, 1897. 
RostrUm as long as or a little shorter than the stalk of inner antennte, shorter than antennal 
scale, arched above; 13 to 14- teeth above, 3 to 5 below. Chelipeds of second pair very unequal. Carpus 
longer or shorter than uterus; carpus and merus distally swollen. Palm strongly compressed, oval or 
oblong-oval, broader than carpus and longer than broad. Fingers widely gaping when flexed; mov- 
able finger curved. Chelipeds armed with spines, which are stronger and slightly curved on the side 
of flexion of segments. Inner, outer, and lower surfaces of palm covered with felt and with long hair. 
Telson pointed, inner of side spines longer than the point. In the National Museum are all grada- 
tions between the two forms hitherto known as olfersii and faustinus. In specimens from Costa Rica, 
the chelipeds are very broad, palm a very little longer than broad, carpus much swollen and as long 
as width of palm, merus much swollen at middle and 1.5 times as long as carpus. This is the most 
extreme form of olfersii. Specimens from La Paz have the cheliped similar to that figured by Ortmann 
(Rev. Mus. Paulista, n, pi. i, f. 10) — the palm nearly twice as long as broad, the carpus about two-thirds 
as long as the palm and subequal to the merus. A specimen from Jamaica represents the most slender 
form of the faustinus variety. The palm is 2.5 times as long as broad, the carpus a little longer than 
palm and 1.33 times as long as merus. Porto Rican specimens from Rio Caguitas resemble strongly 
Saussure’s figure of faustinus. The rostrum, however, does not quite reach the extremity of the 
antennal peduncle. The following shows the dimensions of a number of specimens: 
Locality. 
Sex. 
Length 
of body. 
Length 
of propo- 
dus of 
larger 
cheliped. 
Length 
of palm 
of larger 
cheliped 
(outer 
margin). 
Width 
of palm 
(without 
spines). 
Length 
of carpus. 
Width 
of carpus. 
Length 
of merus. 
Width 
of merus. 
mm. 
min. 
mm. 
mm. 
mm. 
■mm. 
mm. 
i nm. 
Costa Rica 
Male . 
51 
23 
11.2 
9 
9 
5. 7 
12. 5 
6 
...do .. 
22. 5 
13.3 
7 9 
‘J. 5 
4.3 
9.7 
4 
1 Cape St. Lucas 
...do.. 
49.3 
19 
9.6 
5.2 
8.9 
4.2 
9 
3.6 
( Guadeloupe 
...do .. 
88.5 
44.5 
24.3 
13.5 
20 
8.0 
22.3 
9 
Porto Rico (Rio Caguitas) . . 
. . .do . . 
71 
44.2 
25 
12 
22. 6 
8 
18.2 
8 
Jamaica 
. . . do . . 
71.5 
43 
22 
8.7 
22 
6.2 
17 
5. 8 
Porto Rico; Rio Caguitas, Caguas; Rio Grande, near mouth of Rio Caguitas; Rio Bayamon; 
Mayaguez, fresh water; Arroyo; Fajardo; in the rivers about Bayamon (Gundlach). 
Also at Jamaica (Albatross); Haiti (Saussure, Ortmann); Cuba (von Martens, Gibbes); Santo 
Domingo (W. M. Gabb, coll. ) ; Dominica (Pocock); Tobago ( F. A. Ober, coll. ); Port Castries, St. Lucia, 
in small brook (Albatross); Guadeloupe (Mus. L. Guesde) ; Vera Cruz, Mexico (Ortmann); Escondido 
River, Nicaragua, 50 miles from Bluefields (C. W. Richmond, coll. ); La Guaira, Venezuela (Lieut. Wirt 
Robinson, U. S. A., coll.); Rio de Janeiro (von Martens); near Rio de Janeiro (Ortmann); La Paz; 
Cape St. Lucas; Costa Rica; West Africa. 
Common name, Noca (Gundlach). 
Bithynis savig-nyi ( Bate) . 
Brachycarpv.s savignyi Bate, Challenger Rept., Zool., xxiv, 795, pi. cxxix, f. 4, 1888. 
Rostrum horizontal, reaching end of antennal scale; armed with 7 teeth above (3 of which are 
on carapace) and 3 below. Feet of second pair subequal, almost cylindrical, smooth, fingers hairy; 
