. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 36 bulletin: museum of COMPAKATIVE Z0C5L0GY. heavier, wider, especially across forward part of zygoma incisor teeth orange (yellow in 0. costaricensis). Color. — Upper parts bright yellowish red brown, darkest along middle of back, and becoming strong orange rufous on rump and sides, sides of head and at base of whiskers ; top of nose and head duller and more mixed with dark brown-tipped hairs ; chin and under side of neck whitish, rest of under parts ochraceous buff, not sharply contrasted with color of sides ; feet
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 36 bulletin: museum of COMPAKATIVE Z0C5L0GY. heavier, wider, especially across forward part of zygoma incisor teeth orange (yellow in 0. costaricensis). Color. — Upper parts bright yellowish red brown, darkest along middle of back, and becoming strong orange rufous on rump and sides, sides of head and at base of whiskers ; top of nose and head duller and more mixed with dark brown-tipped hairs ; chin and under side of neck whitish, rest of under parts ochraceous buff, not sharply contrasted with color of sides ; feet and hands yel- lowish white; ears dark brown outside, inside with hairs — rather sparse — colored like the back; tail dusky above, grayish below. Young examples differ little from the adults, except in being rather duller in color throughout. Measurements - — No. Sex. Total length. Tail vert. Hind foot. Ear 10,304 (J old ad. 235 130 24 13 10,306 9 old ad. 220 130 24 13 10,303 $ ad. 215 120 25 13 10,298 type ^ old ad. 210 120 25 14 10,302 $ ad. 208 115 24 13 10,297 ^ad. 206 120 24 13 10,295 $ ad. 205 120 24 13 10,300 S yg- ad. 200 118 24 13 10,310 $ .yg- ad. 190 115 24 12 10,305 $ yg- ad. 190 110 25 12 10,309 S yg- 170 98 22 12. Fig. 15. On/zomj/s vegetus. Type. Skull. — Type, old ad. ^, basal length, ; occipito- nasal length, ; zygomatic width, ; mastoid width, 11; interorbital width, ; length of nasals, 9; upper molar series, ; length of single half of mandible, Remarks. — 0. vegetus may prove to be only a northern subspecies of 0. dryas humilior Thomas of Colombia, Bo- gota region to Santa Marta region. Though closely allied, the Chiriqui form has a shorter tail, is rather redder above, and slightly paler below, and its skull is decidedly heavier throughout. On the Volcan de Chiriqui the two species of pigmy Oryzomys occur together. In the Santa Marta Moun- tains, where two species, 0. dryas humilior and 0. navus, also occur, the former
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