352 THE GENUS CALLINECTES—M. J. RATHBUN. 



these species. C. hocourti, with its front of four rounded lobes and long 

 narrow intramedial region, could not be confounded with C. sapidus; 

 while the unusually wide intramedial region of C. ornatus will serve to 

 distinguish it from any other species yet known. A little practice in 

 observing the peculiarities of the carapace will enable one to determine 

 with ease the species of young individuals down to at least one inch in 

 width. 



ANALYTICAL KEY TO THE SPECIES OF CALLIXECTES EXAMINED. 



A. Inner supraorbital fissure closed. 



B. Frontal teeth two sapidus (p. 352). 



B'. Frontal teeth four. 



C. Appendages of first abdominal segment of male much shorter than the 

 abdomen. 

 D. Lateral spine more than twice the length of preceding tooth. 

 E. Intramedial region broad, its anterior width about three times its 



length ornatus (p. 356). 



E'. Intramedial region narrow, its anterior width about twice its length. 

 F. Appendages of first abdominal segment of male greatly exceeding 

 the third segment. 

 G. Appendages with tips straight. Second to sixth antero-lateral 



teeth equilateral daiue (p. 357). 



G'. Appendages with tips curved. Antero-lateral teeth with pos- 

 terior margins longer than anterior arcuatus (p. 362). 



F'. Appendages exceeding the third segment but little, or not at all. 



Ia7-vatus (p. 358). 

 D'. Lateral spine less than twice the length of i\receding tooth. 



tumidus (p. 359). 

 C. Appendages reaching the extremity of abdomen, or nearly so. 



D. Antero-lateral region granulate. Lateral spine between two and three 



times length of preceding tooth toxoies (p. 363). 



D'. Anterw-lateral region smooth. Lateral spine less than twice preceding 



tooth hocourti (p. 360). 



A'. Inner supraorbital fissure open ieUicostis (p. 365). 



CALLINECTES SAPIDUS, new name. 

 (Plates XII; XXIV, fig. 1; XXV, fig. 1; XXVI, fig. 1 ; XXVII, fig. 1.) 



Lupa hasiata, Say, .louru. Acad. Nat. Sci. Phila., I, pp. 65, 443, 1817 (not L. 



hasiata, Desmarest, 1823, nor Milne-Edwards, 1834). 

 Lupa dicantha, De Kay, Xat. Hist. N. Y., Zool., Part VI, Crust., p. 10, pi. in, 



fig. 3, 1844. 

 CaUinectea hastatus, Ordway, Boston Journ. Xat. Hist., VII, p. 568, 1863.— Smith, 



Rept. U. S. Commr. Fish and Fisheries, 1871-1872, p. 548 (1874). 

 CaUinectes hastatus, A. Milne-Edwards, Crust. Reg. Mex., p. 224, 1879 (variety 



of CaUinectes diacanthus). 



Adult. — Carapace moderately convex. Granules of medium size, 

 ciowded on the inner branchial and cardiac regions, scattered and 

 faintly marked on the anterior half of the carapace. The length of the 



