THE BEACHYUEA AND MACEUEA OF POETO EICO. 
(35 
Teleophrys ornatus, sp. nov. 
Carapace longer than broad; two median tubercles, one gastric and one cardiac; a stout suberect 
spine on branchial near postero-lateral angle; three very small spines 
on lateral margin of branchial region; a tubercle on margin of hepatic 
region; two stout tubercles above posterior margin; lateral margin gran- 
ulated; a few other tubercles and tufts of hair scattered on carapace. 
Kostral teeth small, blunt; preorbital lobes smooth, rounded, promi- 
nent; two faint sutures evident in upper margin of orbit. Basal joint 
of antenna with an antero-external tooth and a tubercle on outer mar- 
gin. Cheliped of female very feeble; upper margin cut into laminate 
lobes; wrist also ornamented with about five similar lobes; hand 
smooth, tapering distally; fingers gaping a very little at base. Ambu- 
latory legs with a margin before and behind of irregular laminate lobes, 
on meral, carpal, and propodal segments; dactyli about as long as pro- 
podi, strongly curved, acuminate, denticulate. 
This species differs from T. cristulipes chiefly in its longer carapace and in the more elaborate 
crests on the legs, which are present on the posterior as well as the anterior margin. 
Length of female, bearing eggs, 5.6 mm. ; width, 4.7 mm. 
One female from Mayaguez Harbor in 4 to 6 fathoms, station 6065 (Cat. No. 23774). 
Genus MITHRAX Latreille. 
Mithrax Latreille, Regne Anim. de Cuvier, in, 23, 1817. 
Trachonites Latreille in Desmarest, Diet. Sei. Nat., xxviii, 263, 1823. 
Mithraculus White, List Crust. Brit. Mus., 7, 1847. 
Carapace subtriangular, either broader than long or slightly longer than broad. The front has 
two small rostral horns, often pointed, beside which are other spines or prominences, either preorbital 
or antennal. Orbital borders more or less spinous or tuberculous. Basal article of antenna wide, 
armed in front with two or three strong spines; second article inserted outside the orbit, at base of 
rostrum. Merus of outer maxillipeds wide and dilated outwardly; exognath wide. Sternal plastron 
almost circular. Chelipeds long and strong, especially in male; fingers deeply hollowed out at tip, 
gaping considerably when shut. Ambulatory legs robust, armed with spines and terminated by 
hooked fingers, and often armed with spines on lower surface. Abdomen of male formed of seven 
free segments. 
Key to the Porto Rican species of the genus Mithrax. 
A. Carapace without oblique parallel branchial sulci. 
B. Manus with spines or spinules. 
C. Carapace nearly naked . - spinosissimus 
C. Carapace covered with setae. 
D. Granules of carapace concealed by the dense setae, which are all alike jiilosus 
D'. Granules of carapace not concealed by the set*, which are of two kinds and varying in length plumosus 
B'. Manus without spines. 
C. Rostral horns blunt or tuberculiform. 
D. Antero-lateral prominences four. 
E. Carapace and wrist smooth or nearly so. 
F. Basal antennal joint with two teeth or spines .hispidus 
F'. Basal antennal joint with three teeth or spines Levimanus 
E'. Carapace and wrist distinctly tuberculate. 
F. Rostral horns about as long as broad .depresses 
F'. Rostral horns shorter, broader than long plcuracanllms 
D'. Antero lateral prominences three; postero-lateral one ruber 
C'. Rostral horns sharp. 
D. Rostral horns short. 
E. Four lateral spines hempliiUi 
E'.Two lateral spines holdcri 
D'. Rostral horns long and slender .. acutieornis 
A'. Carapace with oblique parallel branchial sulci. 
B. Antero-lateral margin spilled. 
C. Carapace longer than broad cinctimnnus 
C'. Carapace broader than long . forceps 
B'. Antero-lateral margin lobed. 
C. Carapace slightly broader than long. Postero-lateral angle rounded sculptus 
O'. Carapace much broader than long. Postero-lateral angle angular coryphc 
2d— F. C. B. 1900—5 
Fig. 11. — Teleophrys ornatus , 
female, (a) Carapace, x 4. 
(b) Ambulatory leg, x 8. 
