NEW SPECIES AND SUBSPECIES OF SPIDER CRABS. 



By Mart J. Rathbun, 

 Associate in Zoology, United States National Museum. 



All but two of the new forms are American and will be more 

 fully described in a monograph of spider crabs the publication of 

 which is delayed. 



PODOCHELA SIDNEYI, new species. 



Holotype. — Male, Cat. No. 7253, United States National Museum. 

 Off Cape Hatteras, North Carolina, 49 fathoms, station 2297, 

 Albatross. 



Measurements. — Male holotype, length of carapace 14 mm., width 

 10.7 mm. 



Description. — Near P. riisei'^; differs in the longer ambulatory 

 legs, the straighter and longer dactyls of the last three pairs, which 

 are more than half as long as their respective propodites; cardiac 

 and posterior gastric prominences more produced, spiniform; the 

 flat sternal segments have sharp, cristate margins ; palm less dilated 

 than in riisei, gape of fingers narrower, prehensile teeth more 

 numerous and more uniform in size. 



PODOCHELA BARBARENSIS, new species. 



Holotype. — Male, Cat. No. 48256, United States National Museum. 

 Off Brockway Point, Santa Rosa Island, California, 38-45 fathoms, 

 station 4431, Albatross. 



Measurements. — Male holotype, length of carapace 23.8 mm., 

 length of rostrum 9 mm., width of carapace 12.7 mm. 



Description. — Rostrum a long spine; orbital arch finely spinulous; 

 antennae filiform, the movable articles of the peduncle unusually 

 slender. Chela widest behind middle of palm, thence tapering to end 

 of fingers; gape correspondingly narrow. First leg three times as 

 long as carapace with rostrum, dactyl slightly curved; dactyls of 

 other legs falcate. Sternum deeply grooved between segments. 



PYROMAIA ARACHNA. new species. 



Holotype. — Male, Cat. No. 18144, United States National Museum. 

 Gulf of Mexico, S. W. of Cape San Bias, Florida, 169 fathoms, sta- 

 tion 2400, Albatross. 



'■ Stimpson, Ann. Lye. Nat. Hist. New Yorlc, vol. 7, I860, p. 196, pi. 2, flg. 6. 



No. 2504.— Proceedings U. S. National Museum. Vol. 64, Art. 14. 



1 



