1904.] Allen, Mammals from Tropical America. 65 



In the youngest pair (No. 21572) the main beam has a length * of 

 only 117 mm., is curved inward at the tip, and carries a single point, 

 27 mm. long, the top of the fork being 44 mm. above the edge of the 

 bur; circumference at base (just above bur), 65. (Fig. 17, a and a'.) 



The next in size (No. 21573) has three points instead of two, the 

 main beam in both antlers being forked at the tip. Length of main 

 beam, 182 ; of basal tine, 47 ; of upper tine, 55 ; circumference at base, 

 83. (Fig. 17, 6and&'.) 



The third pair (No. 21567) is much longer, with a long, slender main 

 beam and only the basal tine. Length of main beam, 280; basal tine, 

 60; circumference at base, 80. (Fig. 17, c and c' .) 



The fourth pair (No. 21568) is less massive and shorter, but is more 

 forked, the right antler having three points and the left antler four. 

 Length of main beam, 237; circumference at base, 93. (Fig. 17, d 

 and d'.) 



The fifth pair (No. 21569) is thick and heavy but symmetrical, each 

 antler having three points. Length of main beam, 260; circumfer- 

 ence at base (just above bur), 112. (Fig. 17, e and e' .) 



The sixth pair (No. 21570, apparently prematurely stripped of the 



Fig. 18. Odocoileus costaricensis. Malformed antlers. r 4 nat. size. 



velvet) has the antlers long and slender, each with four points, but the 

 upper one much less developed on the right than on the left. Length 

 of main beam, 315; circumference at base, 100. (Fig. 17, / and f.) 



The seventh pair (No. 21566) is extraordinarily massive and other- 

 wise evidently somewhat abnormal. Each antler has five points, but 



\ Measurement taken along outside curvature, in all cases. If the two antlers of a 

 pair vary in size, the larger antler is the one measured. 



February i 1904.} 5 



