THE BRACHYURA AND MACRURA OE PORTO RICO. 
101 
Length of Porto Rican female, 165 mm.; length of carapace, 62 mm.; of rostrum, 22.6 mm. 
A very abundant species in Porto Rico as well as in other parts of tropical America. 
Porto Rico: San Antonio Bridge, San Juan; San Juan Harbor between Catario and Palo Seco; 
Mayaguez, seined and dredged; Mayaguez Harbor, in 7\ and 75 to 76 fathoms, stations 6058 and 6063; 
Boqueron Bay; Puerto Real; Guanica; Playa de Ponce; Ponce; Aibonito; Arroyo; Hucares; Fajardo. 
Ranges from Hudson River at Sing Sing, New York (Stimpson ), to Rio Grande de Sul, Brazil (Ortmann ) ; 
Harrington Sound, Bermudas (C. M. Allen, coll.); Bermudas (Verrill); West Africa. The greatest 
depth is recorded by Faxon, 955 fathoms, Blake station 29, west of Tortugas. The northern limit of 
this species has lately been extended by the discovery of a single specimen at Katama Bay, Marthas 
Vineyard, by Mr. Vinal N. Edwards, U. S. Fish Commission, September 8, 1900. 
Genus PARAPEN2EUS Smith. 
Pa.rapenxus Smith, Proe. U. S. Nat. Mus., vm, 170, 1885. 
Endognath of first maxilla short and unsegmented; second gnathopod without an epipod, the 
fourteenth somite (posterior somite of the pereion) wholly without branch i;e. Antennular flagella 
shorter than carapace. 
Key to the Porto Rican specie* of the genus Parapenams. 
A. Rostrum with less than ten dorsal teeth. 
B. Sixth segment of pleon less than twice as long as fifth. 
C. Surface of pleon naked and glossy. Telson with a small spine on either side near tip constrictus 
O'. Posterior half of pleon pubescent. Telson with a long, slender spine on either side near tip similis 
B'. Sixth segment of pleon twice as long as fifth amcricanus 
A'. Rostrum with more than ten dorsal teeth megalops 
Parapenaeus constrictus (Stimpson). 
Pensens constrictus Simpson, Ann. Lyc. Nat. Hist. N. Y.,x, 135, 1871. 
Parapenxus constrictus Smith, Proc. U. S. Nat. Mus., vm, 174, 1885. 
Carapace for the most part pubescent; posterior part of branchial regions and whole of abdomen 
naked and glossy. Carapace carinated on its anterior three- fourths, bearing a spine behind base of 
rostrum. A lateral or antennal groove extends three-fifths the length of the carapace. Antennal 
and hepatic spines large. Rostrum reaching middle of penult joint of antennular peduncle; slightly 
arched, extremity slightly deflexed; armed dorsal ly with seven to nine equidistant teeth, diminishing 
in size toward extremity. Antennular peduncle rather short, extending beyond the eyes as far as 
length of eyes; very pubescent above. Abdomen carinated from fourth to sixth segment. Telson 
tapering to a short acuminate tip, armed either side with a short spine. 
Dimensions of female: Length from tip of rostrum to tip of telson, 66 mm. ; length of carapace, 
including rostrum, 26.5 mm.; length of rostrum, 10 mm. 
Taken at Mayaguez and Boqueron Bay, Porto Rico. Other localities for this species are: Off 
Chesapeake Bay, 18 fathoms, Fish Hawk (Smith); off Cape Hatteras, 7 to 27 fathoms, Albatross (Smith); 
Fort Macon, N. C. (Smith ) ; Beaufort, N. C., 4 fathoms (Stimpson) ; Charleston Harbor, S. C. (Stimpson ) ; 
Fort Jefferson, Fla. (Kingsley); Marco Pass (Kingsley); Pensacola, Fla. (J. E. Benedict, coll.); Ber- 
mudas (Smith). 
Parapenaeus simili's (Smith). 
Parapenxus constrictus variety similis Smith, Proc. U. S. Nat. Mus., VIII, 175, 1885. 
Allied to constrictus: Entire surface of carapace and of the fourth, fifth, and sixth segments of 
pleon covered with short, stiff setae. Median carina of carapace extending almost to posterior margin 
and provided with a gastric spine, as in constrictus. Rostrum ascending, its anterior third almost hori- 
zontal; armed with eight or nine teeth. Antennal peduncle longer than in constrictus, its extent beyond 
the eyes being greater than length of eyes; less pubescent than in constrictus. Telson tapering to a very 
long and slender tip, armed either side its base with a long and very slender spine. 
Dimensions of female: Length from tip of rostrum to tip of telson, 80 mm.; length of carapace, 
including rostrum, 31 mm.; length of rostrum, 13.3 mm. The Porto Rican specimens are all smaller 
than the above. 
Taken by the Fish Hawk at. 11 stations at the following localities: Mayaguez Harbor, 41 to 18 
fathoms, sticky mud and sand, stations 6057, 6058, 6059, 6061, abundant; Puerto Real, 8) fathoms, 
