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<br /> <br />110 <br />N ~ <br />Qz <br />32 ~•••r. <br />2 <br />30 <br />108 - 106 <br />~s 1 <br />~. , <br />•`..• ~. <br />~ NM <br />N f~ ~ T~ <br />r._..~Mexico ~A <br />3 <br />4 <br />5_ 1 <br />6 <br /> <br />~~.. <br />11 <br />7 <br />9 <br />10 ~ <br />~-•~~~ <br />15 <br />14 `'~ <br />13 -~ <br />28 16 <br />Fig. 1. Stations surveyed for Gila nigrescens in 1979. Those starred <br />indicate presence, solid spots absence. Station 1 is on the Mimbres River, <br />New Pfexico (all others are in Chihuahua, Mexico). Stations 2 to 7 are on the <br />Rio Casas Grander, 8 to 10 on the Rio Santa Maria, 11 to 12 on the Rio del <br />Carmen, and 13 to 16 in the Laguna Bustillos Basin. <br />M <br /> <br />