Vol. 34, pp. 155-156 December 21, 1921 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON ^, 



NEW SPECIES OF CRABS FROM FORMOSA.^ 

 BY MARY J. RATHBUN. 



The species described below were found among a large collec- 

 tion obtained by the students of the Taihoku (Formosa) Normal 

 School and by Mr. Moichiro Maki, their teacher in natural 

 history. The collection was forwarded to the United States 

 National Museum through the courtesy of Dr. M. Oshima, of 

 the Institute of Science, Government of Formosa. 



Ilea formosensis, sp. nov. 



Hohtype. — Adult male, Cat. No. 54472, United States National Museum. 

 Rokko, Taichu, Formosa; collected by students of Normal School, August, 

 1919. 



Measurements. — Male holotype, length of carapace 18.4 mm., greatest 

 width 28.8 mm. 



Description. — Front narrow, depressed portion subtriangular, tapering 

 anteriorly. Upper margin of orbit sinuous, nearly transverse, not strongly 

 oblique, entire; a line of granules below inner three-fifths of upper margin; 

 lower margin coarsely turreted except near inner end where it is subentire; 

 no accessory row of granules above margin. Antero-lateral angle acute. 

 Sides of carapace subparallel anteriorly, then sloping well inward. Palm 

 coarsely granulate outside, a furrow below upper marginal row of granules, 

 a depression between palm and fixed finger; lines of granules on inner sur- 

 face of palm obliquely transverse and subparallel. Fingers broad, fiat; 

 prehensile edges hollowed a little in basal half; on outer side a ridge parallel 

 to, and near lower edge of fixed finger; a shallow furrow through middle of 

 dactylus, which fades out before reaching distal end, a furrow near upper 

 edge. Fingers either without a large tooth, or a large tooth at middle of 

 fixed finger and another on dactylus at middle of broad gape. Merus of 

 first three ambulatory legs very broad. 



Near JJ . longidigitum (Kingsley)^ which, however, has side margins 

 anteriorly very oblique, diverging forward; upper border of orbit more 



1 Published by permission of the Smithsonian Institution. 

 2Proc. Acad. Nat. Sci. Philadelphia, 1880, p. 144, pi. 9, fig. 13. 

 31— Phoc. Biol. Soc. Wash., Vol. 34, 1921. (155) 



