5o4 RICHARD SWANN LULL ON 



(ieiiiis Exocampe K. Ilitdu'cak. 

 Exocampe E. Hitchcock, '58, p. 142. 



Generic characters. Quadrupedal. Pes tetradactylous, digitigrade, heel occasionally 

 impressing ; the three outermost digits curved outward from the Une of direction. 



Manus pentadactylous, about one half the length of the pes ; not always impressing. 

 Legs moderately long, as indicated by the long step and the narrow trackway. No mor- 

 phological characters exhibited by the tracks. 



The type species is Exocampe arcta. 



Exocampe arcta E. Hitchcock. 

 Exocampe arcta E. Hitchcock, '58, p. 142, pi. 25, figs. 5, 6, 10 ; pi. 4'.), fig. 5. 



SjJecific characters. Pes: divarication of outer toes, 110°. Length of digit L -020 

 m.; of II, .028 m.; of HI, .033 m.; of IV, .033 m. Length of heel. .020 m.; of the foot, 

 .048 m. Length of step, .217 m. Width of trackway, .075 m. 



Manus: divarication of lateral digits, 110°. Length of digit 1, .OO'J m.; of II, .023 

 m.; of III, .025 m.; of IV, .025 m.; of V, .013 m. Digits much less curved than are those 

 of the pes. Manus position in advance of the pes and much farther from the median 

 line. 



The type is no. |f, of the Hitchcock cabinet, from Turner's Falls, Massachusetts. 



Exocampe ornata E. Hitchcock. 

 Exocamp)e ornata E. Hitchcock, '58. p. 143. pi. 25, fig. 11 ; pi. 48, figs. 1, 6. 



Specific characters. Pes: divarication of lateral digits, 100° to 130°. Length of 

 digit I, .006 m.; of II, .007 m.; of HI, .010 m.; of IV, .008 m. Length of step, .055 m. 

 Width of trackway, .025 m. 



Manus : Four digits directed forward, and one to tlie rear ; divarication of the for- 

 mer, 130°. Length of manus, .013 m. 



Exocampe ornata differs from E. arcta in its smaller .size and more delicate form. 



Type specimens, nos. H and |^, in the Hitchccjck cabinet, from Turner's Falls. Massa- 



chusetts. 



Exocampe minima E. Hitchcock. 



Exocatnpe minima E. Hitchcock, '65, p. 11, pi. 18, fiu-. 3. 



Exocampe minima C. H. Hitchcock, in E. Hitchcock, '65, appendix C, p. 89. 



