2904 SMITHSONIAN MISCELLANEOUS COLLECTIONS * [voL. 48 
M—Medial vein or trachea. 
M,, M., M;, and M,—First, second, third, and fourth branches of media. 
Cu—Cubital vein or trachea. 
Cu, and Cu,—First and, second branches of cubitus. 
Ist A—First anal vein or trachea. 
2d A—Second anal vein or trachea. 
3d A—Third anal vein or trachea. 
3d A, and 3d A,—First and second branches of third anal. 
f—Frenulum. 
H—Humeral vein or trachea. 
h—Humeral cross-vein. 
vr-m—Radio-medial cross-vein or -trachea. 
m—Medial cross-vein. 
m-cu—Medio-cubital cross-vein or -trachea. 
