Proceedings of the United States National Museum . n Muesebeck, et al., Hymenoptera of America north of Mexico—Synoptic catalog. Dep. Agr. Monogr. No. 2, pp. Emden, F. I. 1955. In Gordon, Importance of larval characters in classification. Nature, vol. 176, p. The taxonomic significance of the characters of immature insects. Ann. Rev. Ent., vol. 2, pp. 91-106. ICHNEUMONID FINAL INSTAR LARVAE—SHORT 511 Walkley, Luella M. 1956. A tribal revision of the brachycyrtine wasps of the world (Cryptinae- Ichneumonidae). Proc. Nat. Mus., vol. 106, pp. Family I


Proceedings of the United States National Museum . n Muesebeck, et al., Hymenoptera of America north of Mexico—Synoptic catalog. Dep. Agr. Monogr. No. 2, pp. Emden, F. I. 1955. In Gordon, Importance of larval characters in classification. Nature, vol. 176, p. The taxonomic significance of the characters of immature insects. Ann. Rev. Ent., vol. 2, pp. 91-106. ICHNEUMONID FINAL INSTAR LARVAE—SHORT 511 Walkley, Luella M. 1956. A tribal revision of the brachycyrtine wasps of the world (Cryptinae- Ichneumonidae). Proc. Nat. Mus., vol. 106, pp. Family Ichneiunonidae, in Krombein, ed., Hymenoptera of America north of Mexico—Synoptic catalog. Dep. Agr. Monograph No. 2, suppl. 1, pp. 36-62. WiGGLESWORTH, V. B. 1954. The physiology of insect metamorphosis, viii+152 pp. WiSHART, G. 1949. The biology of Melanichneumon rubicundus (Cress.) (Hymenoptera,Ichneiunonidae). Canadian Ent., vol. 80, pp. 118-137, «OVEIINMENT PRINTIHS OFFICEiltlt PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM. issued |o«\N-^r S^toI ^y ^ SMITHSONIAN NATIONAL MUSEUM Vol. 110 Washington : I960 No. 3420 MAMMALS OF NORTHERN COLOMBIA, PRELIMINARYREPORT NO. 8: ARBOREAL RICE RATS, A SYSTEMATICREVISION OF THE SUBGENUS OECOMYS, GENUS ORYZOMYS By Philip Hershkovitz^ Arboreal rice rats are small to medium-sized cricetines of thegenus Oryzomys (family Muridae). They are found only in tropicaland subtropical zone forests of Central and South America. Of thetwo recognized species, the larger, Oryzomys (Oecomys) concolor, occursin northern Colombia. The author collected 27 specimens from six localities during his1941-43 tenure of the Walter Rathbone Bacon Traveling Scholarshipand 38 specimens, including six of the smaller species, Oryzomys(Oecomys) bicolor, in other parts of Colombia while conducting theChicago Natural History Museum-Colombian Zoological Expedi-tion (1949-52). This material and pertinent field observations arethe basis of


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