. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 168 Bulletin Museum of Comparative Zoology, Vol. 136, Figure 10. Inserts to Figure 9; detailed distribution of Tnodopsis j. stenomphala, hybrid /. sfenompha/a X i- juxti- dens, and adjacent populatons of /. /uxtidens. Thick, dashed line surrounds the range of the hybrids, dotted line, /. stenomphala. Numbers without a circle are mean values of samples in character index; samples of /. stenompho/o range from 15-30; hybrid, 35-55; ;'. juxtidens, 60-90 (samples of the latter species also occur in areas not covered b
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 168 Bulletin Museum of Comparative Zoology, Vol. 136, Figure 10. Inserts to Figure 9; detailed distribution of Tnodopsis j. stenomphala, hybrid /. sfenompha/a X i- juxti- dens, and adjacent populatons of /. /uxtidens. Thick, dashed line surrounds the range of the hybrids, dotted line, /. stenomphala. Numbers without a circle are mean values of samples in character index; samples of /. stenompho/o range from 15-30; hybrid, 35-55; ;'. juxtidens, 60-90 (samples of the latter species also occur in areas not covered by the inserts). Other symbols refer to elevation, forest types, and state boundaries, as explained in Figure 3, except that the state lines are marked with thick, solid lines. andoali, Rockbridge, Warwick, and Pittsyl- vania counties (ANSP); Fairfax, North- umberland, Buckingham, and Henrico counties (MC.'Z). ^on, : Zo- ological Park (MCJZ). North Carolina: Durham, Bladen, and New Hanover coun- ties (ANSP): Columbus County (MCZ). South Carolina: Aiken and Orangeburg counties (ANSP). A total ol 30 samples. 1-32 specimens each, 248 specimens alto- gether. Ecology. Triodopsis j. occurs in northern hardwoods, mixed mesophytic, oak-chestnut, oak-pine and southeastern exergreen forests, between sea level and 2000 feet (Fig. 9). It is often found on riverbanks (Hubricht, 1950b; own experi- ence ). j. jiixtidens slightly overlaps the related species T. tridcntata. Pilsbry states (1940: 799) that in the zone of overlap "in any suitable place either tri- dcntata or juxtidens is to be found, but never the two together, in my experience; however, A. F. Archer reports finding them together at Lambert\ille, New ; My experiences in New Jersey and Pennsyl- vania seem to verify Pilsbry's observations. The two species probably have very simi- lar ecological requirements; therefore they cannot coexist in the same habitat for a long period of ti
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