MURIDJS-ARVIOOLINAj:— ABVIGOLA BIPARIUa. 



173 



Taulr XMV.— Jl«uiimiieii(< o/ lkMf-»iiu iry tptniwuKi ^ Iht rii-aiiiuh tgpt from rariaiu loatlUiM Ik Ik* 

 Vnilfd Slam tw$t of M« tflw<nljipi— ConliDued. 



As will he seen, this series embraces the type-specimens uf all tiie 

 nominal species we are to discuss except "montana", anil of this there is 

 a typical exan:ple. The series was made up without the slightest reference 

 to any desired or expected result, and simply includes, in fact, all i he dry speci- 

 mens that have i^ome under our observation. The seven specimens marked 

 "young" are not grown enough to furnish available measurements ; and as 

 (hey would vitiate the result if included, they are omitted in computing the 

 average. 



It is hardly necessary to more than allude to the average of this series 

 OS compared with the eastern ones. The total length falls between that of 

 the Philadelphia and the Illinois series, and is 0.15 below the general average. 

 The length of tail is within a just appreciable fraction of the grand eastern 

 average, taking place between that of the general series and. the Illinois 

 series. The average proportion of body and toil is ^4.18 : 1.53) as 1.00 to 

 0.34, precisely as in the Philadelphia and Massachusetts series. The average 

 foot is precisely as in the Illinois series, and within 0.01 uf the grand eastern 

 nvrroge; only two feet touch 0.90, and none (of the adults) fall below 0.70. 



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